-From c1a081c00f803fc28e51f155f25abe8346ce5f13 Mon Sep 17 00:00:00 2001
+From 17d13fd7881fd3ce9f9b9d44ce435d6caf4b8f28 Mon Sep 17 00:00:00 2001
From: Stefan Becker <stefanb@gpartner-nvidia.com>
Date: Tue, 22 Mar 2016 13:48:07 +0200
-Subject: [PATCH] Add GNU make jobserver client support
+Subject: [PATCH 01/11] Add GNU make jobserver client support
- add new TokenPool interface
- GNU make implementation for TokenPool parses and verifies the magic
http://make.mad-scientist.net/papers/jobserver-implementation/
Fixes https://github.com/ninja-build/ninja/issues/1139
-
-Add TokenPool monitoring to SubprocessSet::DoWork()
-
-Improve on the original jobserver client implementation. This makes
-ninja a more aggressive GNU make jobserver client.
-
-- add monitor interface to TokenPool
-- TokenPool is passed down when main loop indicates that more work is
- ready and would be allowed to start if a token becomes available
-- posix: update DoWork() to monitor TokenPool read file descriptor
-- WaitForCommand() exits when DoWork() sets token flag
-- Main loop starts over when WaitForCommand() sets token exit status
-
-Ignore jobserver when -jN is forced on command line
-
-This emulates the behaviour of GNU make.
-
-- add parallelism_from_cmdline flag to build configuration
-- set the flag when -jN is given on command line
-- pass the flag to TokenPool::Get()
-- GNUmakeTokenPool::Setup()
- * prints a warning when the flag is true and jobserver was detected
- * returns false, i.e. jobserver will be ignored
-- ignore config.parallelism in CanRunMore() when we have a valid
- TokenPool, because it gets always initialized to a default when not
- given on the command line
-
-Honor -lN from MAKEFLAGS
-
-This emulates the behaviour of GNU make.
-
-- build: make a copy of max_load_average and pass it to TokenPool.
-- GNUmakeTokenPool: if we detect a jobserver and a valid -lN argument in
- MAKEFLAGS then set max_load_average to N.
-
-Use LinePrinter for TokenPool messages
-
-- replace printf() with calls to LinePrinter
-- print GNU make jobserver message only when verbose build is requested
-
-Prepare PR for merging
-
-- fix Windows build error in no-op TokenPool implementation
-- improve Acquire() to block for a maximum of 100ms
-- address review comments
-
-Add tests for TokenPool
-
-- TokenPool setup
-- GetMonitorFd() API
-- implicit token and tokens in jobserver pipe
-- Acquire() / Reserve() / Release() protocol
-- Clear() API
-
-Add tests for subprocess module
-
-- add TokenPoolTest stub to provide TokenPool::GetMonitorFd()
-- add two tests
- * both tests set up a dummy GNUmake jobserver pipe
- * both tests call DoWork() with TokenPoolTest
- * test 1: verify that DoWork() detects when a token is available
- * test 2: verify that DoWork() works as before without a token
-- the tests are not compiled in under Windows
-
-Add tests for build module
-
-Add tests that verify the token functionality of the builder main loop.
-We replace the default fake command runner with a special version where
-the tests can control each call to AcquireToken(), CanRunMore() and
-WaitForCommand().
-
-Add Win32 implementation for GNUmakeTokenPool
-
-GNU make uses a semaphore as jobserver protocol on Win32. See also
-
- https://www.gnu.org/software/make/manual/html_node/Windows-Jobserver.html
-
-Usage is pretty simple and straightforward, i.e. WaitForSingleObject()
-to obtain a token and ReleaseSemaphore() to return it.
-
-Unfortunately subprocess-win32.cc uses an I/O completion port (IOCP).
-IOCPs aren't waitable objects, i.e. we can't use WaitForMultipleObjects()
-to wait on the IOCP and the token semaphore at the same time.
-
-Therefore GNUmakeTokenPoolWin32 creates a child thread that waits on the
-token semaphore and posts a dummy I/O completion status on the IOCP when
-it was able to obtain a token. That unblocks SubprocessSet::DoWork() and
-it can then check if a token became available or not.
-
-- split existing GNUmakeTokenPool into common and platform bits
-- add GNUmakeTokenPool interface
-- move the Posix bits to GNUmakeTokenPoolPosix
-- add the Win32 bits as GNUmakeTokenPoolWin32
-- move Setup() method up to TokenPool interface
-- update Subprocess & TokenPool tests accordingly
-
-Prepare PR for merging - part II
-
-- remove unnecessary "struct" from TokenPool
-- add PAPCFUNC cast to QueryUserAPC()
-- remove hard-coded MAKEFLAGS string from win32
-- remove useless build test CompleteNoWork
-- rename TokenPoolTest to TestTokenPool
-- add tokenpool modules to CMake build
-- remove unused no-op TokenPool implementation
-- address review comments from
-
-https://github.com/ninja-build/ninja/pull/1140#pullrequestreview-195195803
-https://github.com/ninja-build/ninja/pull/1140#pullrequestreview-185089255
-https://github.com/ninja-build/ninja/pull/1140#issuecomment-473898963
-https://github.com/ninja-build/ninja/pull/1140#issuecomment-596624610
---
- CMakeLists.txt | 8 +-
- configure.py | 7 +-
- src/build.cc | 127 ++++++++---
- src/build.h | 12 +-
- src/build_test.cc | 363 +++++++++++++++++++++++++++++++-
- src/exit_status.h | 3 +-
- src/ninja.cc | 1 +
- src/subprocess-posix.cc | 33 ++-
- src/subprocess-win32.cc | 11 +-
- src/subprocess.h | 8 +-
- src/subprocess_test.cc | 149 +++++++++++--
- src/tokenpool-gnu-make-posix.cc | 202 ++++++++++++++++++
- src/tokenpool-gnu-make-win32.cc | 239 +++++++++++++++++++++
- src/tokenpool-gnu-make.cc | 108 ++++++++++
- src/tokenpool-gnu-make.h | 40 ++++
- src/tokenpool.h | 42 ++++
- src/tokenpool_test.cc | 269 +++++++++++++++++++++++
- 17 files changed, 1562 insertions(+), 60 deletions(-)
- create mode 100644 src/tokenpool-gnu-make-posix.cc
- create mode 100644 src/tokenpool-gnu-make-win32.cc
+ configure.py | 2 +
+ src/build.cc | 63 ++++++++----
+ src/build.h | 3 +
+ src/tokenpool-gnu-make.cc | 211 ++++++++++++++++++++++++++++++++++++++
+ src/tokenpool-none.cc | 27 +++++
+ src/tokenpool.h | 26 +++++
+ 6 files changed, 310 insertions(+), 22 deletions(-)
create mode 100644 src/tokenpool-gnu-make.cc
- create mode 100644 src/tokenpool-gnu-make.h
+ create mode 100644 src/tokenpool-none.cc
create mode 100644 src/tokenpool.h
- create mode 100644 src/tokenpool_test.cc
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -94,6 +94,7 @@ add_library(libninja OBJECT
- src/parser.cc
- src/state.cc
- src/string_piece_util.cc
-+ src/tokenpool-gnu-make.cc
- src/util.cc
- src/version.cc
- )
-@@ -104,12 +105,16 @@ if(WIN32)
- src/msvc_helper-win32.cc
- src/msvc_helper_main-win32.cc
- src/getopt.c
-+ src/tokenpool-gnu-make-win32.cc
- )
- if(MSVC)
- target_sources(libninja PRIVATE src/minidump-win32.cc)
- endif()
- else()
-- target_sources(libninja PRIVATE src/subprocess-posix.cc)
-+ target_sources(libninja PRIVATE
-+ src/subprocess-posix.cc
-+ src/tokenpool-gnu-make-posix.cc
-+ )
- if(CMAKE_SYSTEM_NAME STREQUAL "OS400" OR CMAKE_SYSTEM_NAME STREQUAL "AIX")
- target_sources(libninja PRIVATE src/getopt.c)
- endif()
-@@ -182,6 +187,7 @@ if(BUILD_TESTING)
- src/string_piece_util_test.cc
- src/subprocess_test.cc
- src/test.cc
-+ src/tokenpool_test.cc
- src/util_test.cc
- )
- if(WIN32)
+diff --git a/configure.py b/configure.py
+index 43904349a8..db3492c93c 100755
--- a/configure.py
+++ b/configure.py
-@@ -514,11 +514,13 @@ for name in ['build',
- 'parser',
- 'state',
- 'string_piece_util',
-+ 'tokenpool-gnu-make',
- 'util',
- 'version']:
+@@ -522,6 +522,7 @@ def has_re2c():
objs += cxx(name, variables=cxxvariables)
if platform.is_windows():
for name in ['subprocess-win32',
-+ 'tokenpool-gnu-make-win32',
++ 'tokenpool-none',
'includes_normalize-win32',
'msvc_helper-win32',
'msvc_helper_main-win32']:
-@@ -527,7 +529,9 @@ if platform.is_windows():
- objs += cxx('minidump-win32', variables=cxxvariables)
+@@ -531,6 +532,7 @@ def has_re2c():
objs += cc('getopt')
else:
-- objs += cxx('subprocess-posix')
-+ for name in ['subprocess-posix',
-+ 'tokenpool-gnu-make-posix']:
-+ objs += cxx(name)
+ objs += cxx('subprocess-posix')
++ objs += cxx('tokenpool-gnu-make')
if platform.is_aix():
objs += cc('getopt')
if platform.is_msvc():
-@@ -582,6 +586,7 @@ for name in ['build_log_test',
- 'string_piece_util_test',
- 'subprocess_test',
- 'test',
-+ 'tokenpool_test',
- 'util_test']:
- objs += cxx(name, variables=cxxvariables)
- if platform.is_windows():
+diff --git a/src/build.cc b/src/build.cc
+index 6f11ed7a3c..fa096eac33 100644
--- a/src/build.cc
+++ b/src/build.cc
-@@ -38,6 +38,7 @@
- #include "graph.h"
+@@ -35,6 +35,7 @@
#include "state.h"
+ #include "status.h"
#include "subprocess.h"
+#include "tokenpool.h"
#include "util.h"
using namespace std;
-@@ -50,8 +51,9 @@ struct DryRunCommandRunner : public Comm
-
- // Overridden from CommandRunner:
- virtual bool CanRunMore() const;
-+ virtual bool AcquireToken();
- virtual bool StartCommand(Edge* edge);
-- virtual bool WaitForCommand(Result* result);
-+ virtual bool WaitForCommand(Result* result, bool more_ready);
-
- private:
- queue<Edge*> finished_;
-@@ -61,12 +63,16 @@ bool DryRunCommandRunner::CanRunMore() c
- return true;
- }
-
-+bool DryRunCommandRunner::AcquireToken() {
-+ return true;
-+}
-+
- bool DryRunCommandRunner::StartCommand(Edge* edge) {
- finished_.push(edge);
- return true;
- }
-
--bool DryRunCommandRunner::WaitForCommand(Result* result) {
-+bool DryRunCommandRunner::WaitForCommand(Result* result, bool more_ready) {
- if (finished_.empty())
- return false;
-
-@@ -379,7 +385,7 @@ void Plan::EdgeWanted(const Edge* edge)
+@@ -149,7 +150,7 @@ void Plan::EdgeWanted(const Edge* edge) {
}
Edge* Plan::FindWork() {
- if (ready_.empty())
+ if (!more_ready())
return NULL;
- set<Edge*>::iterator e = ready_.begin();
+ EdgeSet::iterator e = ready_.begin();
Edge* edge = *e;
-@@ -665,19 +671,39 @@ void Plan::Dump() const {
+@@ -448,8 +449,8 @@ void Plan::Dump() const {
}
struct RealCommandRunner : public CommandRunner {
+ explicit RealCommandRunner(const BuildConfig& config);
+ virtual ~RealCommandRunner();
virtual bool CanRunMore() const;
-+ virtual bool AcquireToken();
virtual bool StartCommand(Edge* edge);
-- virtual bool WaitForCommand(Result* result);
-+ virtual bool WaitForCommand(Result* result, bool more_ready);
- virtual vector<Edge*> GetActiveEdges();
- virtual void Abort();
+ virtual bool WaitForCommand(Result* result);
+@@ -458,9 +459,18 @@ struct RealCommandRunner : public CommandRunner {
const BuildConfig& config_;
-+ // copy of config_.max_load_average; can be modified by TokenPool setup
-+ double max_load_average_;
SubprocessSet subprocs_;
-+ TokenPool* tokens_;
++ TokenPool *tokens_;
map<const Subprocess*, Edge*> subproc_to_edge_;
};
+RealCommandRunner::RealCommandRunner(const BuildConfig& config) : config_(config) {
-+ max_load_average_ = config.max_load_average;
-+ if ((tokens_ = TokenPool::Get()) != NULL) {
-+ if (!tokens_->Setup(config_.parallelism_from_cmdline,
-+ config_.verbosity == BuildConfig::VERBOSE,
-+ max_load_average_)) {
-+ delete tokens_;
-+ tokens_ = NULL;
-+ }
-+ }
++ tokens_ = TokenPool::Get();
+}
+
+RealCommandRunner::~RealCommandRunner() {
vector<Edge*> RealCommandRunner::GetActiveEdges() {
vector<Edge*> edges;
for (map<const Subprocess*, Edge*>::iterator e = subproc_to_edge_.begin();
-@@ -688,14 +714,23 @@ vector<Edge*> RealCommandRunner::GetActi
+@@ -471,14 +481,18 @@ vector<Edge*> RealCommandRunner::GetActiveEdges() {
void RealCommandRunner::Abort() {
subprocs_.Clear();
}
bool RealCommandRunner::CanRunMore() const {
-- size_t subproc_number =
-- subprocs_.running_.size() + subprocs_.finished_.size();
-- return (int)subproc_number < config_.parallelism
+ size_t subproc_number =
+ subprocs_.running_.size() + subprocs_.finished_.size();
+ return (int)subproc_number < config_.parallelism
- && ((subprocs_.running_.empty() || config_.max_load_average <= 0.0f)
- || GetLoadAverage() < config_.max_load_average);
-+ bool parallelism_limit_not_reached =
-+ tokens_ || // ignore config_.parallelism
-+ ((int) (subprocs_.running_.size() +
-+ subprocs_.finished_.size()) < config_.parallelism);
-+ return parallelism_limit_not_reached
+ && (subprocs_.running_.empty() ||
-+ (max_load_average_ <= 0.0f ||
-+ GetLoadAverage() < max_load_average_));
-+}
-+
-+bool RealCommandRunner::AcquireToken() {
-+ return (!tokens_ || tokens_->Acquire());
++ ((config_.max_load_average <= 0.0f ||
++ GetLoadAverage() < config_.max_load_average)
++ && (!tokens_ || tokens_->Acquire())));
}
bool RealCommandRunner::StartCommand(Edge* edge) {
-@@ -703,19 +738,33 @@ bool RealCommandRunner::StartCommand(Edg
+@@ -486,6 +500,8 @@ bool RealCommandRunner::StartCommand(Edge* edge) {
Subprocess* subproc = subprocs_.Add(command, edge->use_console());
if (!subproc)
return false;
subproc_to_edge_.insert(make_pair(subproc, edge));
return true;
- }
-
--bool RealCommandRunner::WaitForCommand(Result* result) {
-+bool RealCommandRunner::WaitForCommand(Result* result, bool more_ready) {
- Subprocess* subproc;
-- while ((subproc = subprocs_.NextFinished()) == NULL) {
-- bool interrupted = subprocs_.DoWork();
-+ subprocs_.ResetTokenAvailable();
-+ while (((subproc = subprocs_.NextFinished()) == NULL) &&
-+ !subprocs_.IsTokenAvailable()) {
-+ bool interrupted = subprocs_.DoWork(more_ready ? tokens_ : NULL);
- if (interrupted)
+@@ -499,6 +515,9 @@ bool RealCommandRunner::WaitForCommand(Result* result) {
return false;
}
-+ // token became available
-+ if (subproc == NULL) {
-+ result->status = ExitTokenAvailable;
-+ return true;
-+ }
-+
-+ // command completed
+ if (tokens_)
+ tokens_->Release();
+
result->status = subproc->Finish();
result->output = subproc->GetOutput();
-@@ -825,38 +874,42 @@ bool Builder::Build(string* err) {
- // command runner.
+@@ -621,31 +640,31 @@ bool Builder::Build(string* err) {
// Second, we attempt to wait for / reap the next finished command.
while (plan_.more_to_do()) {
-- // See if we can start any more commands.
+ // See if we can start any more commands.
- if (failures_allowed && command_runner_->CanRunMore()) {
- if (Edge* edge = plan_.FindWork()) {
- if (edge->GetBindingBool("generator")) {
-- scan_.build_log()->Close();
-- }
-+ // See if we can start any more commands...
-+ bool can_run_more =
-+ failures_allowed &&
-+ plan_.more_ready() &&
-+ command_runner_->CanRunMore();
-+
-+ // ... but we also need a token to do that.
-+ if (can_run_more && command_runner_->AcquireToken()) {
++ if (failures_allowed && plan_.more_ready() &&
++ command_runner_->CanRunMore()) {
+ Edge* edge = plan_.FindWork();
+ if (edge->GetBindingBool("generator")) {
-+ scan_.build_log()->Close();
-+ }
+ scan_.build_log()->Close();
+ }
+
+- if (!StartEdge(edge, err)) {
+ if (!StartEdge(edge, err)) {
+ Cleanup();
+ status_->BuildFinished();
+ return false;
+ }
-
-- if (!StartEdge(edge, err)) {
++
+ if (edge->is_phony()) {
+ if (!plan_.EdgeFinished(edge, Plan::kEdgeSucceeded, err)) {
Cleanup();
}
// See if we can reap any finished commands.
- if (pending_commands) {
- CommandRunner::Result result;
-- if (!command_runner_->WaitForCommand(&result) ||
-+ if (!command_runner_->WaitForCommand(&result, can_run_more) ||
- result.status == ExitInterrupted) {
- Cleanup();
- status_->BuildFinished();
-@@ -864,6 +917,10 @@ bool Builder::Build(string* err) {
- return false;
- }
-
-+ // We might be able to start another command; start the main loop over.
-+ if (result.status == ExitTokenAvailable)
-+ continue;
-+
- --pending_commands;
- if (!FinishCommand(&result, err)) {
- Cleanup();
+diff --git a/src/build.h b/src/build.h
+index d697dfb89e..7dcd111e61 100644
--- a/src/build.h
+++ b/src/build.h
-@@ -55,6 +55,9 @@ struct Plan {
+@@ -52,6 +52,9 @@ struct Plan {
/// Returns true if there's more work to be done.
bool more_to_do() const { return wanted_edges_ > 0 && command_edges_ > 0; }
/// Dumps the current state of the plan.
void Dump() const;
-@@ -139,6 +142,7 @@ private:
- struct CommandRunner {
- virtual ~CommandRunner() {}
- virtual bool CanRunMore() const = 0;
-+ virtual bool AcquireToken() = 0;
- virtual bool StartCommand(Edge* edge) = 0;
-
- /// The result of waiting for a command.
-@@ -150,7 +154,9 @@ struct CommandRunner {
- bool success() const { return status == ExitSuccess; }
- };
- /// Wait for a command to complete, or return false if interrupted.
-- virtual bool WaitForCommand(Result* result) = 0;
-+ /// If more_ready is true then the optional TokenPool is monitored too
-+ /// and we return when a token becomes available.
-+ virtual bool WaitForCommand(Result* result, bool more_ready) = 0;
-
- virtual std::vector<Edge*> GetActiveEdges() { return std::vector<Edge*>(); }
- virtual void Abort() {}
-@@ -158,7 +164,8 @@ struct CommandRunner {
-
- /// Options (e.g. verbosity, parallelism) passed to a build.
- struct BuildConfig {
-- BuildConfig() : verbosity(NORMAL), dry_run(false), parallelism(1),
-+ BuildConfig() : verbosity(NORMAL), dry_run(false),
-+ parallelism(1), parallelism_from_cmdline(false),
- failures_allowed(1), max_load_average(-0.0f) {}
-
- enum Verbosity {
-@@ -169,6 +176,7 @@ struct BuildConfig {
- Verbosity verbosity;
- bool dry_run;
- int parallelism;
-+ bool parallelism_from_cmdline;
- int failures_allowed;
- /// The maximum load average we must not exceed. A negative value
- /// means that we do not have any limit.
---- a/src/build_test.cc
-+++ b/src/build_test.cc
-@@ -15,6 +15,7 @@
- #include "build.h"
-
- #include <assert.h>
-+#include <stdarg.h>
-
- #include "build_log.h"
- #include "deps_log.h"
-@@ -473,8 +474,9 @@ struct FakeCommandRunner : public Comman
-
- // CommandRunner impl
- virtual bool CanRunMore() const;
-+ virtual bool AcquireToken();
- virtual bool StartCommand(Edge* edge);
-- virtual bool WaitForCommand(Result* result);
-+ virtual bool WaitForCommand(Result* result, bool more_ready);
- virtual vector<Edge*> GetActiveEdges();
- virtual void Abort();
-
-@@ -580,6 +582,10 @@ bool FakeCommandRunner::CanRunMore() con
- return active_edges_.size() < max_active_edges_;
- }
-
-+bool FakeCommandRunner::AcquireToken() {
-+ return true;
-+}
+diff --git a/src/tokenpool-gnu-make.cc b/src/tokenpool-gnu-make.cc
+new file mode 100644
+index 0000000000..a8f9b7139d
+--- /dev/null
++++ b/src/tokenpool-gnu-make.cc
+@@ -0,0 +1,211 @@
++// Copyright 2016 Google Inc. All Rights Reserved.
++//
++// Licensed under the Apache License, Version 2.0 (the "License");
++// you may not use this file except in compliance with the License.
++// You may obtain a copy of the License at
++//
++// http://www.apache.org/licenses/LICENSE-2.0
++//
++// Unless required by applicable law or agreed to in writing, software
++// distributed under the License is distributed on an "AS IS" BASIS,
++// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++// See the License for the specific language governing permissions and
++// limitations under the License.
+
- bool FakeCommandRunner::StartCommand(Edge* edge) {
- assert(active_edges_.size() < max_active_edges_);
- assert(find(active_edges_.begin(), active_edges_.end(), edge)
-@@ -625,7 +631,7 @@ bool FakeCommandRunner::StartCommand(Edg
- return true;
- }
-
--bool FakeCommandRunner::WaitForCommand(Result* result) {
-+bool FakeCommandRunner::WaitForCommand(Result* result, bool more_ready) {
- if (active_edges_.empty())
- return false;
-
-@@ -3302,3 +3308,356 @@ TEST_F(BuildTest, DyndepTwoLevelDiscover
- EXPECT_EQ("touch tmp", command_runner_.commands_ran_[3]);
- EXPECT_EQ("touch out", command_runner_.commands_ran_[4]);
- }
++#include "tokenpool.h"
+
-+/// The token tests are concerned with the main loop functionality when
-+// the CommandRunner has an active TokenPool. It is therefore intentional
-+// that the plan doesn't complete and that builder_.Build() returns false!
++#include <errno.h>
++#include <fcntl.h>
++#include <poll.h>
++#include <unistd.h>
++#include <signal.h>
++#include <stdio.h>
++#include <string.h>
++#include <stdlib.h>
+
-+/// Fake implementation of CommandRunner that simulates a TokenPool
-+struct FakeTokenCommandRunner : public CommandRunner {
-+ explicit FakeTokenCommandRunner() {}
++// TokenPool implementation for GNU make jobserver
++// (http://make.mad-scientist.net/papers/jobserver-implementation/)
++struct GNUmakeTokenPool : public TokenPool {
++ GNUmakeTokenPool();
++ virtual ~GNUmakeTokenPool();
+
-+ // CommandRunner impl
-+ virtual bool CanRunMore() const;
-+ virtual bool AcquireToken();
-+ virtual bool StartCommand(Edge* edge);
-+ virtual bool WaitForCommand(Result* result, bool more_ready);
-+ virtual vector<Edge*> GetActiveEdges();
-+ virtual void Abort();
++ virtual bool Acquire();
++ virtual void Reserve();
++ virtual void Release();
++ virtual void Clear();
+
-+ vector<string> commands_ran_;
-+ vector<Edge *> edges_;
++ bool Setup();
+
-+ vector<bool> acquire_token_;
-+ vector<bool> can_run_more_;
-+ vector<bool> wait_for_command_;
-+};
++ private:
++ int available_;
++ int used_;
+
-+bool FakeTokenCommandRunner::CanRunMore() const {
-+ if (can_run_more_.size() == 0) {
-+ EXPECT_FALSE("unexpected call to CommandRunner::CanRunMore()");
-+ return false;
-+ }
++#ifdef _WIN32
++ // @TODO
++#else
++ int rfd_;
++ int wfd_;
+
-+ bool result = can_run_more_[0];
++ struct sigaction old_act_;
++ bool restore_;
+
-+ // Unfortunately CanRunMore() isn't "const" for tests
-+ const_cast<FakeTokenCommandRunner*>(this)->can_run_more_.erase(
-+ const_cast<FakeTokenCommandRunner*>(this)->can_run_more_.begin()
-+ );
++ static int dup_rfd_;
++ static void CloseDupRfd(int signum);
+
-+ return result;
-+}
++ bool CheckFd(int fd);
++ bool SetAlarmHandler();
++#endif
+
-+bool FakeTokenCommandRunner::AcquireToken() {
-+ if (acquire_token_.size() == 0) {
-+ EXPECT_FALSE("unexpected call to CommandRunner::AcquireToken()");
-+ return false;
-+ }
++ void Return();
++};
+
-+ bool result = acquire_token_[0];
-+ acquire_token_.erase(acquire_token_.begin());
-+ return result;
++// every instance owns an implicit token -> available_ == 1
++GNUmakeTokenPool::GNUmakeTokenPool() : available_(1), used_(0),
++ rfd_(-1), wfd_(-1), restore_(false) {
+}
+
-+bool FakeTokenCommandRunner::StartCommand(Edge* edge) {
-+ commands_ran_.push_back(edge->EvaluateCommand());
-+ edges_.push_back(edge);
-+ return true;
++GNUmakeTokenPool::~GNUmakeTokenPool() {
++ Clear();
++ if (restore_)
++ sigaction(SIGALRM, &old_act_, NULL);
+}
+
-+bool FakeTokenCommandRunner::WaitForCommand(Result* result, bool more_ready) {
-+ if (wait_for_command_.size() == 0) {
-+ EXPECT_FALSE("unexpected call to CommandRunner::WaitForCommand()");
++bool GNUmakeTokenPool::CheckFd(int fd) {
++ if (fd < 0)
+ return false;
-+ }
-+
-+ bool expected = wait_for_command_[0];
-+ if (expected != more_ready) {
-+ EXPECT_EQ(expected, more_ready);
++ int ret = fcntl(fd, F_GETFD);
++ if (ret < 0)
+ return false;
-+ }
-+ wait_for_command_.erase(wait_for_command_.begin());
++ return true;
++}
+
-+ if (edges_.size() == 0)
-+ return false;
++int GNUmakeTokenPool::dup_rfd_ = -1;
+
-+ Edge* edge = edges_[0];
-+ result->edge = edge;
++void GNUmakeTokenPool::CloseDupRfd(int signum) {
++ close(dup_rfd_);
++ dup_rfd_ = -1;
++}
+
-+ if (more_ready &&
-+ (edge->rule().name() == "token-available")) {
-+ result->status = ExitTokenAvailable;
++bool GNUmakeTokenPool::SetAlarmHandler() {
++ struct sigaction act;
++ memset(&act, 0, sizeof(act));
++ act.sa_handler = CloseDupRfd;
++ if (sigaction(SIGALRM, &act, &old_act_) < 0) {
++ perror("sigaction:");
++ return(false);
+ } else {
-+ edges_.erase(edges_.begin());
-+ result->status = ExitSuccess;
++ restore_ = true;
++ return(true);
+ }
-+
-+ return true;
+}
+
-+vector<Edge*> FakeTokenCommandRunner::GetActiveEdges() {
-+ return edges_;
-+}
++bool GNUmakeTokenPool::Setup() {
++ const char *value = getenv("MAKEFLAGS");
++ if (value) {
++ // GNU make <= 4.1
++ const char *jobserver = strstr(value, "--jobserver-fds=");
++ // GNU make => 4.2
++ if (!jobserver)
++ jobserver = strstr(value, "--jobserver-auth=");
++ if (jobserver) {
++ int rfd = -1;
++ int wfd = -1;
++ if ((sscanf(jobserver, "%*[^=]=%d,%d", &rfd, &wfd) == 2) &&
++ CheckFd(rfd) &&
++ CheckFd(wfd) &&
++ SetAlarmHandler()) {
++ printf("ninja: using GNU make jobserver.\n");
++ rfd_ = rfd;
++ wfd_ = wfd;
++ return true;
++ }
++ }
++ }
+
-+void FakeTokenCommandRunner::Abort() {
-+ edges_.clear();
++ return false;
+}
+
-+struct BuildTokenTest : public BuildTest {
-+ virtual void SetUp();
-+ virtual void TearDown();
++bool GNUmakeTokenPool::Acquire() {
++ if (available_ > 0)
++ return true;
+
-+ FakeTokenCommandRunner token_command_runner_;
++#ifdef USE_PPOLL
++ pollfd pollfds[] = {{rfd_, POLLIN, 0}};
++ int ret = poll(pollfds, 1, 0);
++#else
++ fd_set set;
++ struct timeval timeout = { 0, 0 };
++ FD_ZERO(&set);
++ FD_SET(rfd_, &set);
++ int ret = select(rfd_ + 1, &set, NULL, NULL, &timeout);
++#endif
++ if (ret > 0) {
++ dup_rfd_ = dup(rfd_);
+
-+ void ExpectAcquireToken(int count, ...);
-+ void ExpectCanRunMore(int count, ...);
-+ void ExpectWaitForCommand(int count, ...);
++ if (dup_rfd_ != -1) {
++ struct sigaction act, old_act;
++ int ret = 0;
+
-+private:
-+ void EnqueueBooleans(vector<bool>& booleans, int count, va_list ao);
-+};
++ memset(&act, 0, sizeof(act));
++ act.sa_handler = CloseDupRfd;
++ if (sigaction(SIGCHLD, &act, &old_act) == 0) {
++ char buf;
+
-+void BuildTokenTest::SetUp() {
-+ BuildTest::SetUp();
++ // block until token read, child exits or timeout
++ alarm(1);
++ ret = read(dup_rfd_, &buf, 1);
++ alarm(0);
+
-+ // replace FakeCommandRunner with FakeTokenCommandRunner
-+ builder_.command_runner_.release();
-+ builder_.command_runner_.reset(&token_command_runner_);
-+}
-+void BuildTokenTest::TearDown() {
-+ EXPECT_EQ(0u, token_command_runner_.acquire_token_.size());
-+ EXPECT_EQ(0u, token_command_runner_.can_run_more_.size());
-+ EXPECT_EQ(0u, token_command_runner_.wait_for_command_.size());
-+
-+ BuildTest::TearDown();
-+}
++ sigaction(SIGCHLD, &old_act, NULL);
++ }
+
-+void BuildTokenTest::ExpectAcquireToken(int count, ...) {
-+ va_list ap;
-+ va_start(ap, count);
-+ EnqueueBooleans(token_command_runner_.acquire_token_, count, ap);
-+ va_end(ap);
-+}
++ CloseDupRfd(0);
+
-+void BuildTokenTest::ExpectCanRunMore(int count, ...) {
-+ va_list ap;
-+ va_start(ap, count);
-+ EnqueueBooleans(token_command_runner_.can_run_more_, count, ap);
-+ va_end(ap);
++ if (ret > 0) {
++ available_++;
++ return true;
++ }
++ }
++ }
++ return false;
+}
+
-+void BuildTokenTest::ExpectWaitForCommand(int count, ...) {
-+ va_list ap;
-+ va_start(ap, count);
-+ EnqueueBooleans(token_command_runner_.wait_for_command_, count, ap);
-+ va_end(ap);
++void GNUmakeTokenPool::Reserve() {
++ available_--;
++ used_++;
+}
+
-+void BuildTokenTest::EnqueueBooleans(vector<bool>& booleans, int count, va_list ap) {
-+ while (count--) {
-+ int value = va_arg(ap, int);
-+ booleans.push_back(!!value); // force bool
++void GNUmakeTokenPool::Return() {
++ const char buf = '+';
++ while (1) {
++ int ret = write(wfd_, &buf, 1);
++ if (ret > 0)
++ available_--;
++ if ((ret != -1) || (errno != EINTR))
++ return;
++ // write got interrupted - retry
+ }
+}
+
-+TEST_F(BuildTokenTest, DoNotAquireToken) {
-+ // plan should execute one command
-+ string err;
-+ EXPECT_TRUE(builder_.AddTarget("cat1", &err));
-+ ASSERT_EQ("", err);
-+
-+ // pretend we can't run anything
-+ ExpectCanRunMore(1, false);
-+
-+ EXPECT_FALSE(builder_.Build(&err));
-+ EXPECT_EQ("stuck [this is a bug]", err);
-+
-+ EXPECT_EQ(0u, token_command_runner_.commands_ran_.size());
++void GNUmakeTokenPool::Release() {
++ available_++;
++ used_--;
++ if (available_ > 1)
++ Return();
+}
+
-+TEST_F(BuildTokenTest, DoNotStartWithoutToken) {
-+ // plan should execute one command
-+ string err;
-+ EXPECT_TRUE(builder_.AddTarget("cat1", &err));
-+ ASSERT_EQ("", err);
-+
-+ // we could run a command but do not have a token for it
-+ ExpectCanRunMore(1, true);
-+ ExpectAcquireToken(1, false);
-+
-+ EXPECT_FALSE(builder_.Build(&err));
-+ EXPECT_EQ("stuck [this is a bug]", err);
-+
-+ EXPECT_EQ(0u, token_command_runner_.commands_ran_.size());
++void GNUmakeTokenPool::Clear() {
++ while (used_ > 0)
++ Release();
++ while (available_ > 1)
++ Return();
+}
+
-+TEST_F(BuildTokenTest, CompleteOneStep) {
-+ // plan should execute one command
-+ string err;
-+ EXPECT_TRUE(builder_.AddTarget("cat1", &err));
-+ ASSERT_EQ("", err);
-+
-+ // allow running of one command
-+ ExpectCanRunMore(1, true);
-+ ExpectAcquireToken(1, true);
-+ // block and wait for command to finalize
-+ ExpectWaitForCommand(1, false);
-+
-+ EXPECT_TRUE(builder_.Build(&err));
-+ EXPECT_EQ("", err);
-+
-+ EXPECT_EQ(1u, token_command_runner_.commands_ran_.size());
-+ EXPECT_TRUE(token_command_runner_.commands_ran_[0] == "cat in1 > cat1");
++struct TokenPool *TokenPool::Get(void) {
++ GNUmakeTokenPool *tokenpool = new GNUmakeTokenPool;
++ if (tokenpool->Setup())
++ return tokenpool;
++ else
++ delete tokenpool;
++ return NULL;
+}
+diff --git a/src/tokenpool-none.cc b/src/tokenpool-none.cc
+new file mode 100644
+index 0000000000..602b3316f5
+--- /dev/null
++++ b/src/tokenpool-none.cc
+@@ -0,0 +1,27 @@
++// Copyright 2016 Google Inc. All Rights Reserved.
++//
++// Licensed under the Apache License, Version 2.0 (the "License");
++// you may not use this file except in compliance with the License.
++// You may obtain a copy of the License at
++//
++// http://www.apache.org/licenses/LICENSE-2.0
++//
++// Unless required by applicable law or agreed to in writing, software
++// distributed under the License is distributed on an "AS IS" BASIS,
++// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++// See the License for the specific language governing permissions and
++// limitations under the License.
+
-+TEST_F(BuildTokenTest, AcquireOneToken) {
-+ // plan should execute more than one command
-+ string err;
-+ EXPECT_TRUE(builder_.AddTarget("cat12", &err));
-+ ASSERT_EQ("", err);
-+
-+ // allow running of one command
-+ ExpectCanRunMore(3, true, false, false);
-+ ExpectAcquireToken(1, true);
-+ // block and wait for command to finalize
-+ ExpectWaitForCommand(1, false);
++#include "tokenpool.h"
+
-+ EXPECT_FALSE(builder_.Build(&err));
-+ EXPECT_EQ("stuck [this is a bug]", err);
++#include <fcntl.h>
++#include <poll.h>
++#include <unistd.h>
++#include <stdio.h>
++#include <string.h>
++#include <stdlib.h>
+
-+ EXPECT_EQ(1u, token_command_runner_.commands_ran_.size());
-+ // any of the two dependencies could have been executed
-+ EXPECT_TRUE(token_command_runner_.commands_ran_[0] == "cat in1 > cat1" ||
-+ token_command_runner_.commands_ran_[0] == "cat in1 in2 > cat2");
++// No-op TokenPool implementation
++struct TokenPool *TokenPool::Get(void) {
++ return NULL;
+}
+diff --git a/src/tokenpool.h b/src/tokenpool.h
+new file mode 100644
+index 0000000000..f560b1083b
+--- /dev/null
++++ b/src/tokenpool.h
+@@ -0,0 +1,26 @@
++// Copyright 2016 Google Inc. All Rights Reserved.
++//
++// Licensed under the Apache License, Version 2.0 (the "License");
++// you may not use this file except in compliance with the License.
++// You may obtain a copy of the License at
++//
++// http://www.apache.org/licenses/LICENSE-2.0
++//
++// Unless required by applicable law or agreed to in writing, software
++// distributed under the License is distributed on an "AS IS" BASIS,
++// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++// See the License for the specific language governing permissions and
++// limitations under the License.
+
-+TEST_F(BuildTokenTest, WantTwoTokens) {
-+ // plan should execute more than one command
-+ string err;
-+ EXPECT_TRUE(builder_.AddTarget("cat12", &err));
-+ ASSERT_EQ("", err);
-+
-+ // allow running of one command
-+ ExpectCanRunMore(3, true, true, false);
-+ ExpectAcquireToken(2, true, false);
-+ // wait for command to finalize or token to become available
-+ ExpectWaitForCommand(1, true);
++// interface to token pool
++struct TokenPool {
++ virtual ~TokenPool() {}
+
-+ EXPECT_FALSE(builder_.Build(&err));
-+ EXPECT_EQ("stuck [this is a bug]", err);
++ virtual bool Acquire() = 0;
++ virtual void Reserve() = 0;
++ virtual void Release() = 0;
++ virtual void Clear() = 0;
+
-+ EXPECT_EQ(1u, token_command_runner_.commands_ran_.size());
-+ // any of the two dependencies could have been executed
-+ EXPECT_TRUE(token_command_runner_.commands_ran_[0] == "cat in1 > cat1" ||
-+ token_command_runner_.commands_ran_[0] == "cat in1 in2 > cat2");
++ // returns NULL if token pool is not available
++ static struct TokenPool *Get(void);
++};
+
+From ccaccc610cd456f6068758f82e72006364c7380b Mon Sep 17 00:00:00 2001
+From: Stefan Becker <stefanb@gpartner-nvidia.com>
+Date: Fri, 27 May 2016 16:47:10 +0300
+Subject: [PATCH 02/11] Add TokenPool monitoring to SubprocessSet::DoWork()
+
+Improve on the original jobserver client implementation. This makes
+ninja a more aggressive GNU make jobserver client.
+
+- add monitor interface to TokenPool
+- TokenPool is passed down when main loop indicates that more work is
+ ready and would be allowed to start if a token becomes available
+- posix: update DoWork() to monitor TokenPool read file descriptor
+- WaitForCommand() exits when DoWork() sets token flag
+- Main loop starts over when WaitForCommand() sets token exit status
+---
+ src/build.cc | 53 +++++++++++++++++++++++++++++----------
+ src/build.h | 3 ++-
+ src/build_test.cc | 9 +++++--
+ src/exit_status.h | 3 ++-
+ src/subprocess-posix.cc | 33 ++++++++++++++++++++++--
+ src/subprocess-win32.cc | 2 +-
+ src/subprocess.h | 8 +++++-
+ src/subprocess_test.cc | 47 +++++++++++++++++++++++-----------
+ src/tokenpool-gnu-make.cc | 5 ++++
+ src/tokenpool.h | 6 +++++
+ 10 files changed, 134 insertions(+), 35 deletions(-)
+
+diff --git a/src/build.cc b/src/build.cc
+index fa096eac33..a25c349050 100644
+--- a/src/build.cc
++++ b/src/build.cc
+@@ -48,8 +48,9 @@ struct DryRunCommandRunner : public CommandRunner {
+
+ // Overridden from CommandRunner:
+ virtual bool CanRunMore() const;
++ virtual bool AcquireToken();
+ virtual bool StartCommand(Edge* edge);
+- virtual bool WaitForCommand(Result* result);
++ virtual bool WaitForCommand(Result* result, bool more_ready);
+
+ private:
+ queue<Edge*> finished_;
+@@ -59,12 +60,16 @@ bool DryRunCommandRunner::CanRunMore() const {
+ return true;
+ }
+
++bool DryRunCommandRunner::AcquireToken() {
++ return true;
+}
+
-+TEST_F(BuildTokenTest, CompleteTwoSteps) {
-+ ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
-+"build out1: cat in1\n"
-+"build out2: cat out1\n"));
-+
-+ // plan should execute more than one command
-+ string err;
-+ EXPECT_TRUE(builder_.AddTarget("out2", &err));
-+ ASSERT_EQ("", err);
-+
-+ // allow running of two commands
-+ ExpectCanRunMore(2, true, true);
-+ ExpectAcquireToken(2, true, true);
-+ // wait for commands to finalize
-+ ExpectWaitForCommand(2, false, false);
-+
-+ EXPECT_TRUE(builder_.Build(&err));
-+ EXPECT_EQ("", err);
-+
-+ EXPECT_EQ(2u, token_command_runner_.commands_ran_.size());
-+ EXPECT_TRUE(token_command_runner_.commands_ran_[0] == "cat in1 > out1");
-+ EXPECT_TRUE(token_command_runner_.commands_ran_[1] == "cat out1 > out2");
+ bool DryRunCommandRunner::StartCommand(Edge* edge) {
+ finished_.push(edge);
+ return true;
+ }
+
+-bool DryRunCommandRunner::WaitForCommand(Result* result) {
++bool DryRunCommandRunner::WaitForCommand(Result* result, bool more_ready) {
+ if (finished_.empty())
+ return false;
+
+@@ -452,8 +457,9 @@ struct RealCommandRunner : public CommandRunner {
+ explicit RealCommandRunner(const BuildConfig& config);
+ virtual ~RealCommandRunner();
+ virtual bool CanRunMore() const;
++ virtual bool AcquireToken();
+ virtual bool StartCommand(Edge* edge);
+- virtual bool WaitForCommand(Result* result);
++ virtual bool WaitForCommand(Result* result, bool more_ready);
+ virtual vector<Edge*> GetActiveEdges();
+ virtual void Abort();
+
+@@ -490,9 +496,12 @@ bool RealCommandRunner::CanRunMore() const {
+ subprocs_.running_.size() + subprocs_.finished_.size();
+ return (int)subproc_number < config_.parallelism
+ && (subprocs_.running_.empty() ||
+- ((config_.max_load_average <= 0.0f ||
+- GetLoadAverage() < config_.max_load_average)
+- && (!tokens_ || tokens_->Acquire())));
++ (config_.max_load_average <= 0.0f ||
++ GetLoadAverage() < config_.max_load_average));
+}
+
-+TEST_F(BuildTokenTest, TwoCommandsInParallel) {
-+ ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
-+"rule token-available\n"
-+" command = cat $in > $out\n"
-+"build out1: token-available in1\n"
-+"build out2: token-available in2\n"
-+"build out12: cat out1 out2\n"));
-+
-+ // plan should execute more than one command
-+ string err;
-+ EXPECT_TRUE(builder_.AddTarget("out12", &err));
-+ ASSERT_EQ("", err);
-+
-+ // 1st command: token available -> allow running
-+ // 2nd command: no token available but becomes available later
-+ ExpectCanRunMore(4, true, true, true, false);
-+ ExpectAcquireToken(3, true, false, true);
-+ // 1st call waits for command to finalize or token to become available
-+ // 2nd call waits for command to finalize
-+ // 3rd call waits for command to finalize
-+ ExpectWaitForCommand(3, true, false, false);
-+
-+ EXPECT_FALSE(builder_.Build(&err));
-+ EXPECT_EQ("stuck [this is a bug]", err);
-+
-+ EXPECT_EQ(2u, token_command_runner_.commands_ran_.size());
-+ EXPECT_TRUE((token_command_runner_.commands_ran_[0] == "cat in1 > out1" &&
-+ token_command_runner_.commands_ran_[1] == "cat in2 > out2") ||
-+ (token_command_runner_.commands_ran_[0] == "cat in2 > out2" &&
-+ token_command_runner_.commands_ran_[1] == "cat in1 > out1"));
-+}
-+
-+TEST_F(BuildTokenTest, CompleteThreeStepsSerial) {
-+ // plan should execute more than one command
-+ string err;
-+ EXPECT_TRUE(builder_.AddTarget("cat12", &err));
-+ ASSERT_EQ("", err);
++bool RealCommandRunner::AcquireToken() {
++ return (!tokens_ || tokens_->Acquire());
+ }
+
+ bool RealCommandRunner::StartCommand(Edge* edge) {
+@@ -507,14 +516,23 @@ bool RealCommandRunner::StartCommand(Edge* edge) {
+ return true;
+ }
+
+-bool RealCommandRunner::WaitForCommand(Result* result) {
++bool RealCommandRunner::WaitForCommand(Result* result, bool more_ready) {
+ Subprocess* subproc;
+- while ((subproc = subprocs_.NextFinished()) == NULL) {
+- bool interrupted = subprocs_.DoWork();
++ subprocs_.ResetTokenAvailable();
++ while (((subproc = subprocs_.NextFinished()) == NULL) &&
++ !subprocs_.IsTokenAvailable()) {
++ bool interrupted = subprocs_.DoWork(more_ready ? tokens_ : NULL);
+ if (interrupted)
+ return false;
+ }
+
++ // token became available
++ if (subproc == NULL) {
++ result->status = ExitTokenAvailable;
++ return true;
++ }
+
-+ // allow running of all commands
-+ ExpectCanRunMore(4, true, true, true, true);
-+ ExpectAcquireToken(4, true, false, true, true);
-+ // wait for commands to finalize
-+ ExpectWaitForCommand(3, true, false, false);
++ // command completed
+ if (tokens_)
+ tokens_->Release();
+
+@@ -639,9 +657,14 @@ bool Builder::Build(string* err) {
+ // command runner.
+ // Second, we attempt to wait for / reap the next finished command.
+ while (plan_.more_to_do()) {
+- // See if we can start any more commands.
+- if (failures_allowed && plan_.more_ready() &&
+- command_runner_->CanRunMore()) {
++ // See if we can start any more commands...
++ bool can_run_more =
++ failures_allowed &&
++ plan_.more_ready() &&
++ command_runner_->CanRunMore();
+
-+ EXPECT_TRUE(builder_.Build(&err));
-+ EXPECT_EQ("", err);
++ // ... but we also need a token to do that.
++ if (can_run_more && command_runner_->AcquireToken()) {
+ Edge* edge = plan_.FindWork();
+ if (edge->GetBindingBool("generator")) {
+ scan_.build_log()->Close();
+@@ -670,7 +693,7 @@ bool Builder::Build(string* err) {
+ // See if we can reap any finished commands.
+ if (pending_commands) {
+ CommandRunner::Result result;
+- if (!command_runner_->WaitForCommand(&result) ||
++ if (!command_runner_->WaitForCommand(&result, can_run_more) ||
+ result.status == ExitInterrupted) {
+ Cleanup();
+ status_->BuildFinished();
+@@ -678,6 +701,10 @@ bool Builder::Build(string* err) {
+ return false;
+ }
+
++ // We might be able to start another command; start the main loop over.
++ if (result.status == ExitTokenAvailable)
++ continue;
+
-+ EXPECT_EQ(3u, token_command_runner_.commands_ran_.size());
-+ EXPECT_TRUE((token_command_runner_.commands_ran_[0] == "cat in1 > cat1" &&
-+ token_command_runner_.commands_ran_[1] == "cat in1 in2 > cat2") ||
-+ (token_command_runner_.commands_ran_[0] == "cat in1 in2 > cat2" &&
-+ token_command_runner_.commands_ran_[1] == "cat in1 > cat1" ));
-+ EXPECT_TRUE(token_command_runner_.commands_ran_[2] == "cat cat1 cat2 > cat12");
+ --pending_commands;
+ if (!FinishCommand(&result, err)) {
+ Cleanup();
+diff --git a/src/build.h b/src/build.h
+index 7dcd111e61..35c7b97d12 100644
+--- a/src/build.h
++++ b/src/build.h
+@@ -139,6 +139,7 @@ struct Plan {
+ struct CommandRunner {
+ virtual ~CommandRunner() {}
+ virtual bool CanRunMore() const = 0;
++ virtual bool AcquireToken() = 0;
+ virtual bool StartCommand(Edge* edge) = 0;
+
+ /// The result of waiting for a command.
+@@ -150,7 +151,7 @@ struct CommandRunner {
+ bool success() const { return status == ExitSuccess; }
+ };
+ /// Wait for a command to complete, or return false if interrupted.
+- virtual bool WaitForCommand(Result* result) = 0;
++ virtual bool WaitForCommand(Result* result, bool more_ready) = 0;
+
+ virtual std::vector<Edge*> GetActiveEdges() { return std::vector<Edge*>(); }
+ virtual void Abort() {}
+diff --git a/src/build_test.cc b/src/build_test.cc
+index 4ef62b2113..7a5ff4015a 100644
+--- a/src/build_test.cc
++++ b/src/build_test.cc
+@@ -474,8 +474,9 @@ struct FakeCommandRunner : public CommandRunner {
+
+ // CommandRunner impl
+ virtual bool CanRunMore() const;
++ virtual bool AcquireToken();
+ virtual bool StartCommand(Edge* edge);
+- virtual bool WaitForCommand(Result* result);
++ virtual bool WaitForCommand(Result* result, bool more_ready);
+ virtual vector<Edge*> GetActiveEdges();
+ virtual void Abort();
+
+@@ -578,6 +579,10 @@ bool FakeCommandRunner::CanRunMore() const {
+ return active_edges_.size() < max_active_edges_;
+ }
+
++bool FakeCommandRunner::AcquireToken() {
++ return true;
+}
+
-+TEST_F(BuildTokenTest, CompleteThreeStepsParallel) {
-+ ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
-+"rule token-available\n"
-+" command = cat $in > $out\n"
-+"build out1: token-available in1\n"
-+"build out2: token-available in2\n"
-+"build out12: cat out1 out2\n"));
-+
-+ // plan should execute more than one command
-+ string err;
-+ EXPECT_TRUE(builder_.AddTarget("out12", &err));
-+ ASSERT_EQ("", err);
-+
-+ // allow running of all commands
-+ ExpectCanRunMore(4, true, true, true, true);
-+ ExpectAcquireToken(4, true, false, true, true);
-+ // wait for commands to finalize
-+ ExpectWaitForCommand(4, true, false, false, false);
-+
-+ EXPECT_TRUE(builder_.Build(&err));
-+ EXPECT_EQ("", err);
-+
-+ EXPECT_EQ(3u, token_command_runner_.commands_ran_.size());
-+ EXPECT_TRUE((token_command_runner_.commands_ran_[0] == "cat in1 > out1" &&
-+ token_command_runner_.commands_ran_[1] == "cat in2 > out2") ||
-+ (token_command_runner_.commands_ran_[0] == "cat in2 > out2" &&
-+ token_command_runner_.commands_ran_[1] == "cat in1 > out1"));
-+ EXPECT_TRUE(token_command_runner_.commands_ran_[2] == "cat out1 out2 > out12");
-+}
+ bool FakeCommandRunner::StartCommand(Edge* edge) {
+ assert(active_edges_.size() < max_active_edges_);
+ assert(find(active_edges_.begin(), active_edges_.end(), edge)
+@@ -649,7 +654,7 @@ bool FakeCommandRunner::StartCommand(Edge* edge) {
+ return true;
+ }
+
+-bool FakeCommandRunner::WaitForCommand(Result* result) {
++bool FakeCommandRunner::WaitForCommand(Result* result, bool more_ready) {
+ if (active_edges_.empty())
+ return false;
+
+diff --git a/src/exit_status.h b/src/exit_status.h
+index a714ece791..75ebf6a7a0 100644
--- a/src/exit_status.h
+++ b/src/exit_status.h
@@ -18,7 +18,8 @@
};
#endif // NINJA_EXIT_STATUS_H_
---- a/src/ninja.cc
-+++ b/src/ninja.cc
-@@ -1289,6 +1289,7 @@ int ReadFlags(int* argc, char*** argv,
- // We want to run N jobs in parallel. For N = 0, INT_MAX
- // is close enough to infinite for most sane builds.
- config->parallelism = value > 0 ? value : INT_MAX;
-+ config->parallelism_from_cmdline = true;
- break;
- }
- case 'k': {
+diff --git a/src/subprocess-posix.cc b/src/subprocess-posix.cc
+index 8e785406c9..74451b0be2 100644
--- a/src/subprocess-posix.cc
+++ b/src/subprocess-posix.cc
@@ -13,6 +13,7 @@
#include <sys/select.h>
#include <assert.h>
-@@ -249,7 +250,7 @@ Subprocess *SubprocessSet::Add(const str
+@@ -249,7 +250,7 @@ Subprocess *SubprocessSet::Add(const string& command, bool use_console) {
}
#ifdef USE_PPOLL
-bool SubprocessSet::DoWork() {
-+bool SubprocessSet::DoWork(TokenPool* tokens) {
++bool SubprocessSet::DoWork(struct TokenPool* tokens) {
vector<pollfd> fds;
nfds_t nfds = 0;
#else // !defined(USE_PPOLL)
-bool SubprocessSet::DoWork() {
-+bool SubprocessSet::DoWork(TokenPool* tokens) {
++bool SubprocessSet::DoWork(struct TokenPool* tokens) {
fd_set set;
int nfds = 0;
FD_ZERO(&set);
return IsInterrupted();
}
#endif // !defined(USE_PPOLL)
+diff --git a/src/subprocess-win32.cc b/src/subprocess-win32.cc
+index ff3baaca7f..66d2c2c430 100644
--- a/src/subprocess-win32.cc
+++ b/src/subprocess-win32.cc
-@@ -13,6 +13,7 @@
- // limitations under the License.
-
- #include "subprocess.h"
-+#include "tokenpool.h"
-
- #include <assert.h>
- #include <stdio.h>
-@@ -251,11 +252,14 @@ Subprocess *SubprocessSet::Add(const str
+@@ -251,7 +251,7 @@ Subprocess *SubprocessSet::Add(const string& command, bool use_console) {
return subprocess;
}
-bool SubprocessSet::DoWork() {
-+bool SubprocessSet::DoWork(TokenPool* tokens) {
++bool SubprocessSet::DoWork(struct TokenPool* tokens) {
DWORD bytes_read;
Subprocess* subproc;
OVERLAPPED* overlapped;
-
-+ if (tokens)
-+ tokens->WaitForTokenAvailability(ioport_);
-+
- if (!GetQueuedCompletionStatus(ioport_, &bytes_read, (PULONG_PTR)&subproc,
- &overlapped, INFINITE)) {
- if (GetLastError() != ERROR_BROKEN_PIPE)
-@@ -266,6 +270,11 @@ bool SubprocessSet::DoWork() {
- // delivered by NotifyInterrupted above.
- return true;
-
-+ if (tokens && tokens->TokenIsAvailable((ULONG_PTR)subproc)) {
-+ token_available_ = true;
-+ return false;
-+ }
-+
- subproc->OnPipeReady();
-
- if (subproc->Done()) {
+diff --git a/src/subprocess.h b/src/subprocess.h
+index 9e3d2ee98f..9ea67ea477 100644
--- a/src/subprocess.h
+++ b/src/subprocess.h
@@ -76,6 +76,8 @@ struct Subprocess {
#ifdef _WIN32
static BOOL WINAPI NotifyInterrupted(DWORD dwCtrlType);
static HANDLE ioport_;
+diff --git a/src/subprocess_test.cc b/src/subprocess_test.cc
+index 073fe86931..4bc8083e26 100644
--- a/src/subprocess_test.cc
+++ b/src/subprocess_test.cc
-@@ -13,6 +13,7 @@
- // limitations under the License.
-
- #include "subprocess.h"
-+#include "tokenpool.h"
-
- #include "test.h"
-
-@@ -34,8 +35,30 @@ const char* kSimpleCommand = "cmd /c dir
- const char* kSimpleCommand = "ls /";
- #endif
-
-+struct TestTokenPool : public TokenPool {
-+ bool Acquire() { return false; }
-+ void Reserve() {}
-+ void Release() {}
-+ void Clear() {}
-+ bool Setup(bool ignore_unused, bool verbose, double& max_load_average) { return false; }
-+
-+#ifdef _WIN32
-+ bool _token_available;
-+ void WaitForTokenAvailability(HANDLE ioport) {
-+ if (_token_available)
-+ // unblock GetQueuedCompletionStatus()
-+ PostQueuedCompletionStatus(ioport, 0, (ULONG_PTR) this, NULL);
-+ }
-+ bool TokenIsAvailable(ULONG_PTR key) { return key == (ULONG_PTR) this; }
-+#else
-+ int _fd;
-+ int GetMonitorFd() { return _fd; }
-+#endif
-+};
-+
- struct SubprocessTest : public testing::Test {
- SubprocessSet subprocs_;
-+ TestTokenPool tokens_;
- };
-
- } // anonymous namespace
-@@ -45,10 +68,12 @@ TEST_F(SubprocessTest, BadCommandStderr)
+@@ -45,10 +45,12 @@ TEST_F(SubprocessTest, BadCommandStderr) {
Subprocess* subproc = subprocs_.Add("cmd /c ninja_no_such_command");
ASSERT_NE((Subprocess *) 0, subproc);
- subprocs_.DoWork();
+ subprocs_.DoWork(NULL);
}
-+ ASSERT_FALSE(subprocs_.IsTokenAvailable());
++ ASSERT_EQ(false, subprocs_.IsTokenAvailable());
EXPECT_EQ(ExitFailure, subproc->Finish());
EXPECT_NE("", subproc->GetOutput());
-@@ -59,10 +84,12 @@ TEST_F(SubprocessTest, NoSuchCommand) {
+@@ -59,10 +61,12 @@ TEST_F(SubprocessTest, NoSuchCommand) {
Subprocess* subproc = subprocs_.Add("ninja_no_such_command");
ASSERT_NE((Subprocess *) 0, subproc);
- subprocs_.DoWork();
+ subprocs_.DoWork(NULL);
}
-+ ASSERT_FALSE(subprocs_.IsTokenAvailable());
++ ASSERT_EQ(false, subprocs_.IsTokenAvailable());
EXPECT_EQ(ExitFailure, subproc->Finish());
EXPECT_NE("", subproc->GetOutput());
-@@ -78,9 +105,11 @@ TEST_F(SubprocessTest, InterruptChild) {
+@@ -78,9 +82,11 @@ TEST_F(SubprocessTest, InterruptChild) {
Subprocess* subproc = subprocs_.Add("kill -INT $$");
ASSERT_NE((Subprocess *) 0, subproc);
- subprocs_.DoWork();
+ subprocs_.DoWork(NULL);
}
-+ ASSERT_FALSE(subprocs_.IsTokenAvailable());
++ ASSERT_EQ(false, subprocs_.IsTokenAvailable());
EXPECT_EQ(ExitInterrupted, subproc->Finish());
}
-@@ -90,7 +119,7 @@ TEST_F(SubprocessTest, InterruptParent)
+@@ -90,7 +96,7 @@ TEST_F(SubprocessTest, InterruptParent) {
ASSERT_NE((Subprocess *) 0, subproc);
while (!subproc->Done()) {
if (interrupted)
return;
}
-@@ -102,9 +131,11 @@ TEST_F(SubprocessTest, InterruptChildWit
+@@ -102,9 +108,11 @@ TEST_F(SubprocessTest, InterruptChildWithSigTerm) {
Subprocess* subproc = subprocs_.Add("kill -TERM $$");
ASSERT_NE((Subprocess *) 0, subproc);
- subprocs_.DoWork();
+ subprocs_.DoWork(NULL);
}
-+ ASSERT_FALSE(subprocs_.IsTokenAvailable());
++ ASSERT_EQ(false, subprocs_.IsTokenAvailable());
EXPECT_EQ(ExitInterrupted, subproc->Finish());
}
-@@ -114,7 +145,7 @@ TEST_F(SubprocessTest, InterruptParentWi
+@@ -114,7 +122,7 @@ TEST_F(SubprocessTest, InterruptParentWithSigTerm) {
ASSERT_NE((Subprocess *) 0, subproc);
while (!subproc->Done()) {
if (interrupted)
return;
}
-@@ -126,9 +157,11 @@ TEST_F(SubprocessTest, InterruptChildWit
+@@ -126,9 +134,11 @@ TEST_F(SubprocessTest, InterruptChildWithSigHup) {
Subprocess* subproc = subprocs_.Add("kill -HUP $$");
ASSERT_NE((Subprocess *) 0, subproc);
- subprocs_.DoWork();
+ subprocs_.DoWork(NULL);
}
-+ ASSERT_FALSE(subprocs_.IsTokenAvailable());
++ ASSERT_EQ(false, subprocs_.IsTokenAvailable());
EXPECT_EQ(ExitInterrupted, subproc->Finish());
}
-@@ -138,7 +171,7 @@ TEST_F(SubprocessTest, InterruptParentWi
+@@ -138,7 +148,7 @@ TEST_F(SubprocessTest, InterruptParentWithSigHup) {
ASSERT_NE((Subprocess *) 0, subproc);
while (!subproc->Done()) {
if (interrupted)
return;
}
-@@ -153,9 +186,11 @@ TEST_F(SubprocessTest, Console) {
+@@ -153,9 +163,11 @@ TEST_F(SubprocessTest, Console) {
subprocs_.Add("test -t 0 -a -t 1 -a -t 2", /*use_console=*/true);
ASSERT_NE((Subprocess*)0, subproc);
- subprocs_.DoWork();
+ subprocs_.DoWork(NULL);
}
-+ ASSERT_FALSE(subprocs_.IsTokenAvailable());
++ ASSERT_EQ(false, subprocs_.IsTokenAvailable());
EXPECT_EQ(ExitSuccess, subproc->Finish());
}
-@@ -167,9 +202,11 @@ TEST_F(SubprocessTest, SetWithSingle) {
+@@ -167,9 +179,11 @@ TEST_F(SubprocessTest, SetWithSingle) {
Subprocess* subproc = subprocs_.Add(kSimpleCommand);
ASSERT_NE((Subprocess *) 0, subproc);
- subprocs_.DoWork();
+ subprocs_.DoWork(NULL);
}
-+ ASSERT_FALSE(subprocs_.IsTokenAvailable());
++ ASSERT_EQ(false, subprocs_.IsTokenAvailable());
ASSERT_EQ(ExitSuccess, subproc->Finish());
ASSERT_NE("", subproc->GetOutput());
-@@ -200,12 +237,13 @@ TEST_F(SubprocessTest, SetWithMulti) {
+@@ -200,12 +214,13 @@ TEST_F(SubprocessTest, SetWithMulti) {
ASSERT_EQ("", processes[i]->GetOutput());
}
+ subprocs_.DoWork(NULL);
}
-
-+ ASSERT_FALSE(subprocs_.IsTokenAvailable());
++ ASSERT_EQ(false, subprocs_.IsTokenAvailable());
ASSERT_EQ(0u, subprocs_.running_.size());
ASSERT_EQ(3u, subprocs_.finished_.size());
-@@ -237,8 +275,10 @@ TEST_F(SubprocessTest, SetWithLots) {
+@@ -237,8 +252,10 @@ TEST_F(SubprocessTest, SetWithLots) {
ASSERT_NE((Subprocess *) 0, subproc);
procs.push_back(subproc);
}
while (!subprocs_.running_.empty())
- subprocs_.DoWork();
+ subprocs_.DoWork(NULL);
-+ ASSERT_FALSE(subprocs_.IsTokenAvailable());
++ ASSERT_EQ(false, subprocs_.IsTokenAvailable());
for (size_t i = 0; i < procs.size(); ++i) {
ASSERT_EQ(ExitSuccess, procs[i]->Finish());
ASSERT_NE("", procs[i]->GetOutput());
-@@ -254,10 +294,91 @@ TEST_F(SubprocessTest, SetWithLots) {
+@@ -254,9 +271,11 @@ TEST_F(SubprocessTest, SetWithLots) {
// that stdin is closed.
TEST_F(SubprocessTest, ReadStdin) {
Subprocess* subproc = subprocs_.Add("cat -");
- subprocs_.DoWork();
+ subprocs_.DoWork(NULL);
}
-+ ASSERT_FALSE(subprocs_.IsTokenAvailable());
++ ASSERT_EQ(false, subprocs_.IsTokenAvailable());
ASSERT_EQ(ExitSuccess, subproc->Finish());
ASSERT_EQ(1u, subprocs_.finished_.size());
}
- #endif // _WIN32
-+
-+TEST_F(SubprocessTest, TokenAvailable) {
-+ Subprocess* subproc = subprocs_.Add(kSimpleCommand);
-+ ASSERT_NE((Subprocess *) 0, subproc);
+diff --git a/src/tokenpool-gnu-make.cc b/src/tokenpool-gnu-make.cc
+index a8f9b7139d..396bb7d874 100644
+--- a/src/tokenpool-gnu-make.cc
++++ b/src/tokenpool-gnu-make.cc
+@@ -33,6 +33,7 @@ struct GNUmakeTokenPool : public TokenPool {
+ virtual void Reserve();
+ virtual void Release();
+ virtual void Clear();
++ virtual int GetMonitorFd();
+
+ bool Setup();
+
+@@ -201,6 +202,10 @@ void GNUmakeTokenPool::Clear() {
+ Return();
+ }
+
++int GNUmakeTokenPool::GetMonitorFd() {
++ return(rfd_);
++}
+
-+ // simulate GNUmake jobserver pipe with 1 token
+ struct TokenPool *TokenPool::Get(void) {
+ GNUmakeTokenPool *tokenpool = new GNUmakeTokenPool;
+ if (tokenpool->Setup())
+diff --git a/src/tokenpool.h b/src/tokenpool.h
+index f560b1083b..301e1998ee 100644
+--- a/src/tokenpool.h
++++ b/src/tokenpool.h
+@@ -21,6 +21,12 @@ struct TokenPool {
+ virtual void Release() = 0;
+ virtual void Clear() = 0;
+
+#ifdef _WIN32
-+ tokens_._token_available = true;
++ // @TODO
+#else
-+ int fds[2];
-+ ASSERT_EQ(0u, pipe(fds));
-+ tokens_._fd = fds[0];
-+ ASSERT_EQ(1u, write(fds[1], "T", 1));
++ virtual int GetMonitorFd() = 0;
+#endif
+
-+ subprocs_.ResetTokenAvailable();
-+ subprocs_.DoWork(&tokens_);
-+#ifdef _WIN32
-+ tokens_._token_available = false;
-+ // we need to loop here as we have no conrol where the token
-+ // I/O completion post ends up in the queue
-+ while (!subproc->Done() && !subprocs_.IsTokenAvailable()) {
-+ subprocs_.DoWork(&tokens_);
-+ }
-+#endif
+ // returns NULL if token pool is not available
+ static struct TokenPool *Get(void);
+ };
+
+From d09f3d77821b3b1fdf09fc0ef8e814907675eafb Mon Sep 17 00:00:00 2001
+From: Stefan Becker <chemobejk@gmail.com>
+Date: Sun, 12 Nov 2017 16:58:55 +0200
+Subject: [PATCH 03/11] Ignore jobserver when -jN is forced on command line
+
+This emulates the behaviour of GNU make.
+
+- add parallelism_from_cmdline flag to build configuration
+- set the flag when -jN is given on command line
+- pass the flag to TokenPool::Get()
+- GNUmakeTokenPool::Setup()
+ * prints a warning when the flag is true and jobserver was detected
+ * returns false, i.e. jobserver will be ignored
+- ignore config.parallelism in CanRunMore() when we have a valid
+ TokenPool, because it gets always initialized to a default when not
+ given on the command line
+---
+ src/build.cc | 10 ++++++----
+ src/build.h | 4 +++-
+ src/ninja.cc | 1 +
+ src/tokenpool-gnu-make.cc | 34 +++++++++++++++++++---------------
+ src/tokenpool-none.cc | 4 ++--
+ src/tokenpool.h | 4 ++--
+ 6 files changed, 33 insertions(+), 24 deletions(-)
+
+diff --git a/src/build.cc b/src/build.cc
+index a25c349050..406a84ec39 100644
+--- a/src/build.cc
++++ b/src/build.cc
+@@ -470,7 +470,7 @@ struct RealCommandRunner : public CommandRunner {
+ };
+
+ RealCommandRunner::RealCommandRunner(const BuildConfig& config) : config_(config) {
+- tokens_ = TokenPool::Get();
++ tokens_ = TokenPool::Get(config_.parallelism_from_cmdline);
+ }
+
+ RealCommandRunner::~RealCommandRunner() {
+@@ -492,9 +492,11 @@ void RealCommandRunner::Abort() {
+ }
+
+ bool RealCommandRunner::CanRunMore() const {
+- size_t subproc_number =
+- subprocs_.running_.size() + subprocs_.finished_.size();
+- return (int)subproc_number < config_.parallelism
++ bool parallelism_limit_not_reached =
++ tokens_ || // ignore config_.parallelism
++ ((int) (subprocs_.running_.size() +
++ subprocs_.finished_.size()) < config_.parallelism);
++ return parallelism_limit_not_reached
+ && (subprocs_.running_.empty() ||
+ (config_.max_load_average <= 0.0f ||
+ GetLoadAverage() < config_.max_load_average));
+diff --git a/src/build.h b/src/build.h
+index 35c7b97d12..dfde576573 100644
+--- a/src/build.h
++++ b/src/build.h
+@@ -159,7 +159,8 @@ struct CommandRunner {
+
+ /// Options (e.g. verbosity, parallelism) passed to a build.
+ struct BuildConfig {
+- BuildConfig() : verbosity(NORMAL), dry_run(false), parallelism(1),
++ BuildConfig() : verbosity(NORMAL), dry_run(false),
++ parallelism(1), parallelism_from_cmdline(false),
+ failures_allowed(1), max_load_average(-0.0f) {}
+
+ enum Verbosity {
+@@ -171,6 +172,7 @@ struct BuildConfig {
+ Verbosity verbosity;
+ bool dry_run;
+ int parallelism;
++ bool parallelism_from_cmdline;
+ int failures_allowed;
+ /// The maximum load average we must not exceed. A negative value
+ /// means that we do not have any limit.
+diff --git a/src/ninja.cc b/src/ninja.cc
+index df39ba92d1..d904c56c4e 100644
+--- a/src/ninja.cc
++++ b/src/ninja.cc
+@@ -1447,6 +1447,7 @@ int ReadFlags(int* argc, char*** argv,
+ // We want to run N jobs in parallel. For N = 0, INT_MAX
+ // is close enough to infinite for most sane builds.
+ config->parallelism = value > 0 ? value : INT_MAX;
++ config->parallelism_from_cmdline = true;
+ deferGuessParallelism.needGuess = false;
+ break;
+ }
+diff --git a/src/tokenpool-gnu-make.cc b/src/tokenpool-gnu-make.cc
+index 396bb7d874..af4be05a31 100644
+--- a/src/tokenpool-gnu-make.cc
++++ b/src/tokenpool-gnu-make.cc
+@@ -1,4 +1,4 @@
+-// Copyright 2016 Google Inc. All Rights Reserved.
++// Copyright 2016-2017 Google Inc. All Rights Reserved.
+ //
+ // Licensed under the Apache License, Version 2.0 (the "License");
+ // you may not use this file except in compliance with the License.
+@@ -35,7 +35,7 @@ struct GNUmakeTokenPool : public TokenPool {
+ virtual void Clear();
+ virtual int GetMonitorFd();
+
+- bool Setup();
++ bool Setup(bool ignore);
+
+ private:
+ int available_;
+@@ -100,7 +100,7 @@ bool GNUmakeTokenPool::SetAlarmHandler() {
+ }
+ }
+
+-bool GNUmakeTokenPool::Setup() {
++bool GNUmakeTokenPool::Setup(bool ignore) {
+ const char *value = getenv("MAKEFLAGS");
+ if (value) {
+ // GNU make <= 4.1
+@@ -109,16 +109,20 @@ bool GNUmakeTokenPool::Setup() {
+ if (!jobserver)
+ jobserver = strstr(value, "--jobserver-auth=");
+ if (jobserver) {
+- int rfd = -1;
+- int wfd = -1;
+- if ((sscanf(jobserver, "%*[^=]=%d,%d", &rfd, &wfd) == 2) &&
+- CheckFd(rfd) &&
+- CheckFd(wfd) &&
+- SetAlarmHandler()) {
+- printf("ninja: using GNU make jobserver.\n");
+- rfd_ = rfd;
+- wfd_ = wfd;
+- return true;
++ if (ignore) {
++ printf("ninja: warning: -jN forced on command line; ignoring GNU make jobserver.\n");
++ } else {
++ int rfd = -1;
++ int wfd = -1;
++ if ((sscanf(jobserver, "%*[^=]=%d,%d", &rfd, &wfd) == 2) &&
++ CheckFd(rfd) &&
++ CheckFd(wfd) &&
++ SetAlarmHandler()) {
++ printf("ninja: using GNU make jobserver.\n");
++ rfd_ = rfd;
++ wfd_ = wfd;
++ return true;
++ }
+ }
+ }
+ }
+@@ -206,9 +210,9 @@ int GNUmakeTokenPool::GetMonitorFd() {
+ return(rfd_);
+ }
+
+-struct TokenPool *TokenPool::Get(void) {
++struct TokenPool *TokenPool::Get(bool ignore) {
+ GNUmakeTokenPool *tokenpool = new GNUmakeTokenPool;
+- if (tokenpool->Setup())
++ if (tokenpool->Setup(ignore))
+ return tokenpool;
+ else
+ delete tokenpool;
+diff --git a/src/tokenpool-none.cc b/src/tokenpool-none.cc
+index 602b3316f5..199b22264b 100644
+--- a/src/tokenpool-none.cc
++++ b/src/tokenpool-none.cc
+@@ -1,4 +1,4 @@
+-// Copyright 2016 Google Inc. All Rights Reserved.
++// Copyright 2016-2017 Google Inc. All Rights Reserved.
+ //
+ // Licensed under the Apache License, Version 2.0 (the "License");
+ // you may not use this file except in compliance with the License.
+@@ -22,6 +22,6 @@
+ #include <stdlib.h>
+
+ // No-op TokenPool implementation
+-struct TokenPool *TokenPool::Get(void) {
++struct TokenPool *TokenPool::Get(bool ignore) {
+ return NULL;
+ }
+diff --git a/src/tokenpool.h b/src/tokenpool.h
+index 301e1998ee..878a0933c2 100644
+--- a/src/tokenpool.h
++++ b/src/tokenpool.h
+@@ -1,4 +1,4 @@
+-// Copyright 2016 Google Inc. All Rights Reserved.
++// Copyright 2016-2017 Google Inc. All Rights Reserved.
+ //
+ // Licensed under the Apache License, Version 2.0 (the "License");
+ // you may not use this file except in compliance with the License.
+@@ -28,5 +28,5 @@ struct TokenPool {
+ #endif
+
+ // returns NULL if token pool is not available
+- static struct TokenPool *Get(void);
++ static struct TokenPool *Get(bool ignore);
+ };
+
+From dfe4ca753caee65bf9041e2b4e883dfa172a5c6a Mon Sep 17 00:00:00 2001
+From: Stefan Becker <chemobejk@gmail.com>
+Date: Sun, 12 Nov 2017 18:04:12 +0200
+Subject: [PATCH 04/11] Honor -lN from MAKEFLAGS
+
+This emulates the behaviour of GNU make.
+
+- build: make a copy of max_load_average and pass it to TokenPool.
+- GNUmakeTokenPool: if we detect a jobserver and a valid -lN argument in
+ MAKEFLAGS then set max_load_average to N.
+---
+ src/build.cc | 10 +++++++---
+ src/tokenpool-gnu-make.cc | 19 +++++++++++++++----
+ src/tokenpool-none.cc | 2 +-
+ src/tokenpool.h | 2 +-
+ 4 files changed, 24 insertions(+), 9 deletions(-)
+
+diff --git a/src/build.cc b/src/build.cc
+index 406a84ec39..9e6272d035 100644
+--- a/src/build.cc
++++ b/src/build.cc
+@@ -464,13 +464,17 @@ struct RealCommandRunner : public CommandRunner {
+ virtual void Abort();
+
+ const BuildConfig& config_;
++ // copy of config_.max_load_average; can be modified by TokenPool setup
++ double max_load_average_;
+ SubprocessSet subprocs_;
+ TokenPool *tokens_;
+ map<const Subprocess*, Edge*> subproc_to_edge_;
+ };
+
+ RealCommandRunner::RealCommandRunner(const BuildConfig& config) : config_(config) {
+- tokens_ = TokenPool::Get(config_.parallelism_from_cmdline);
++ max_load_average_ = config.max_load_average;
++ tokens_ = TokenPool::Get(config_.parallelism_from_cmdline,
++ max_load_average_);
+ }
+
+ RealCommandRunner::~RealCommandRunner() {
+@@ -498,8 +502,8 @@ bool RealCommandRunner::CanRunMore() const {
+ subprocs_.finished_.size()) < config_.parallelism);
+ return parallelism_limit_not_reached
+ && (subprocs_.running_.empty() ||
+- (config_.max_load_average <= 0.0f ||
+- GetLoadAverage() < config_.max_load_average));
++ (max_load_average_ <= 0.0f ||
++ GetLoadAverage() < max_load_average_));
+ }
+
+ bool RealCommandRunner::AcquireToken() {
+diff --git a/src/tokenpool-gnu-make.cc b/src/tokenpool-gnu-make.cc
+index af4be05a31..fb654c4d88 100644
+--- a/src/tokenpool-gnu-make.cc
++++ b/src/tokenpool-gnu-make.cc
+@@ -35,7 +35,7 @@ struct GNUmakeTokenPool : public TokenPool {
+ virtual void Clear();
+ virtual int GetMonitorFd();
+
+- bool Setup(bool ignore);
++ bool Setup(bool ignore, double& max_load_average);
+
+ private:
+ int available_;
+@@ -100,7 +100,7 @@ bool GNUmakeTokenPool::SetAlarmHandler() {
+ }
+ }
+
+-bool GNUmakeTokenPool::Setup(bool ignore) {
++bool GNUmakeTokenPool::Setup(bool ignore, double& max_load_average) {
+ const char *value = getenv("MAKEFLAGS");
+ if (value) {
+ // GNU make <= 4.1
+@@ -118,9 +118,20 @@ bool GNUmakeTokenPool::Setup(bool ignore) {
+ CheckFd(rfd) &&
+ CheckFd(wfd) &&
+ SetAlarmHandler()) {
++ const char *l_arg = strstr(value, " -l");
++ int load_limit = -1;
++
+ printf("ninja: using GNU make jobserver.\n");
+ rfd_ = rfd;
+ wfd_ = wfd;
++
++ // translate GNU make -lN to ninja -lN
++ if (l_arg &&
++ (sscanf(l_arg + 3, "%d ", &load_limit) == 1) &&
++ (load_limit > 0)) {
++ max_load_average = load_limit;
++ }
++
+ return true;
+ }
+ }
+@@ -210,9 +221,9 @@ int GNUmakeTokenPool::GetMonitorFd() {
+ return(rfd_);
+ }
+
+-struct TokenPool *TokenPool::Get(bool ignore) {
++struct TokenPool *TokenPool::Get(bool ignore, double& max_load_average) {
+ GNUmakeTokenPool *tokenpool = new GNUmakeTokenPool;
+- if (tokenpool->Setup(ignore))
++ if (tokenpool->Setup(ignore, max_load_average))
+ return tokenpool;
+ else
+ delete tokenpool;
+diff --git a/src/tokenpool-none.cc b/src/tokenpool-none.cc
+index 199b22264b..e8e25426c3 100644
+--- a/src/tokenpool-none.cc
++++ b/src/tokenpool-none.cc
+@@ -22,6 +22,6 @@
+ #include <stdlib.h>
+
+ // No-op TokenPool implementation
+-struct TokenPool *TokenPool::Get(bool ignore) {
++struct TokenPool *TokenPool::Get(bool ignore, double& max_load_average) {
+ return NULL;
+ }
+diff --git a/src/tokenpool.h b/src/tokenpool.h
+index 878a0933c2..f9e8cc2ee0 100644
+--- a/src/tokenpool.h
++++ b/src/tokenpool.h
+@@ -28,5 +28,5 @@ struct TokenPool {
+ #endif
+
+ // returns NULL if token pool is not available
+- static struct TokenPool *Get(bool ignore);
++ static struct TokenPool *Get(bool ignore, double& max_load_average);
+ };
+
+From 1c10047fc6a3269ba42839da19361e09cbc06ff0 Mon Sep 17 00:00:00 2001
+From: Stefan Becker <chemobejk@gmail.com>
+Date: Wed, 6 Dec 2017 22:14:21 +0200
+Subject: [PATCH 05/11] Use LinePrinter for TokenPool messages
+
+- replace printf() with calls to LinePrinter
+- print GNU make jobserver message only when verbose build is requested
+---
+ src/build.cc | 1 +
+ src/tokenpool-gnu-make.cc | 22 ++++++++++++++++------
+ src/tokenpool-none.cc | 4 +++-
+ src/tokenpool.h | 4 +++-
+ 4 files changed, 23 insertions(+), 8 deletions(-)
+
+diff --git a/src/build.cc b/src/build.cc
+index 9e6272d035..662e4bd7be 100644
+--- a/src/build.cc
++++ b/src/build.cc
+@@ -474,6 +474,7 @@ struct RealCommandRunner : public CommandRunner {
+ RealCommandRunner::RealCommandRunner(const BuildConfig& config) : config_(config) {
+ max_load_average_ = config.max_load_average;
+ tokens_ = TokenPool::Get(config_.parallelism_from_cmdline,
++ config_.verbosity == BuildConfig::VERBOSE,
+ max_load_average_);
+ }
+
+diff --git a/src/tokenpool-gnu-make.cc b/src/tokenpool-gnu-make.cc
+index fb654c4d88..b0d3e6ebc4 100644
+--- a/src/tokenpool-gnu-make.cc
++++ b/src/tokenpool-gnu-make.cc
+@@ -23,6 +23,8 @@
+ #include <string.h>
+ #include <stdlib.h>
+
++#include "line_printer.h"
+
-+ EXPECT_TRUE(subprocs_.IsTokenAvailable());
-+ EXPECT_EQ(0u, subprocs_.finished_.size());
+ // TokenPool implementation for GNU make jobserver
+ // (http://make.mad-scientist.net/papers/jobserver-implementation/)
+ struct GNUmakeTokenPool : public TokenPool {
+@@ -35,7 +37,7 @@ struct GNUmakeTokenPool : public TokenPool {
+ virtual void Clear();
+ virtual int GetMonitorFd();
+
+- bool Setup(bool ignore, double& max_load_average);
++ bool Setup(bool ignore, bool verbose, double& max_load_average);
+
+ private:
+ int available_;
+@@ -100,7 +102,9 @@ bool GNUmakeTokenPool::SetAlarmHandler() {
+ }
+ }
+
+-bool GNUmakeTokenPool::Setup(bool ignore, double& max_load_average) {
++bool GNUmakeTokenPool::Setup(bool ignore,
++ bool verbose,
++ double& max_load_average) {
+ const char *value = getenv("MAKEFLAGS");
+ if (value) {
+ // GNU make <= 4.1
+@@ -109,8 +113,10 @@ bool GNUmakeTokenPool::Setup(bool ignore, double& max_load_average) {
+ if (!jobserver)
+ jobserver = strstr(value, "--jobserver-auth=");
+ if (jobserver) {
++ LinePrinter printer;
++
+ if (ignore) {
+- printf("ninja: warning: -jN forced on command line; ignoring GNU make jobserver.\n");
++ printer.PrintOnNewLine("ninja: warning: -jN forced on command line; ignoring GNU make jobserver.\n");
+ } else {
+ int rfd = -1;
+ int wfd = -1;
+@@ -121,7 +127,9 @@ bool GNUmakeTokenPool::Setup(bool ignore, double& max_load_average) {
+ const char *l_arg = strstr(value, " -l");
+ int load_limit = -1;
+
+- printf("ninja: using GNU make jobserver.\n");
++ if (verbose) {
++ printer.PrintOnNewLine("ninja: using GNU make jobserver.\n");
++ }
+ rfd_ = rfd;
+ wfd_ = wfd;
+
+@@ -221,9 +229,11 @@ int GNUmakeTokenPool::GetMonitorFd() {
+ return(rfd_);
+ }
+
+-struct TokenPool *TokenPool::Get(bool ignore, double& max_load_average) {
++struct TokenPool *TokenPool::Get(bool ignore,
++ bool verbose,
++ double& max_load_average) {
+ GNUmakeTokenPool *tokenpool = new GNUmakeTokenPool;
+- if (tokenpool->Setup(ignore, max_load_average))
++ if (tokenpool->Setup(ignore, verbose, max_load_average))
+ return tokenpool;
+ else
+ delete tokenpool;
+diff --git a/src/tokenpool-none.cc b/src/tokenpool-none.cc
+index e8e25426c3..1c1c499c8d 100644
+--- a/src/tokenpool-none.cc
++++ b/src/tokenpool-none.cc
+@@ -22,6 +22,8 @@
+ #include <stdlib.h>
+
+ // No-op TokenPool implementation
+-struct TokenPool *TokenPool::Get(bool ignore, double& max_load_average) {
++struct TokenPool *TokenPool::Get(bool ignore,
++ bool verbose,
++ double& max_load_average) {
+ return NULL;
+ }
+diff --git a/src/tokenpool.h b/src/tokenpool.h
+index f9e8cc2ee0..4bf477f20c 100644
+--- a/src/tokenpool.h
++++ b/src/tokenpool.h
+@@ -28,5 +28,7 @@ struct TokenPool {
+ #endif
+
+ // returns NULL if token pool is not available
+- static struct TokenPool *Get(bool ignore, double& max_load_average);
++ static struct TokenPool *Get(bool ignore,
++ bool verbose,
++ double& max_load_average);
+ };
+
+From fdbf68416e3574add3bffd0b637d0694fbaba320 Mon Sep 17 00:00:00 2001
+From: Stefan Becker <chemobejk@gmail.com>
+Date: Sat, 7 Apr 2018 17:11:21 +0300
+Subject: [PATCH 06/11] Prepare PR for merging
+
+- fix Windows build error in no-op TokenPool implementation
+- improve Acquire() to block for a maximum of 100ms
+- address review comments
+---
+ src/build.h | 2 ++
+ src/tokenpool-gnu-make.cc | 53 +++++++++++++++++++++++++++++++++------
+ src/tokenpool-none.cc | 7 +-----
+ 3 files changed, 49 insertions(+), 13 deletions(-)
+
+diff --git a/src/build.h b/src/build.h
+index dfde576573..66ddefb888 100644
+--- a/src/build.h
++++ b/src/build.h
+@@ -151,6 +151,8 @@ struct CommandRunner {
+ bool success() const { return status == ExitSuccess; }
+ };
+ /// Wait for a command to complete, or return false if interrupted.
++ /// If more_ready is true then the optional TokenPool is monitored too
++ /// and we return when a token becomes available.
+ virtual bool WaitForCommand(Result* result, bool more_ready) = 0;
+
+ virtual std::vector<Edge*> GetActiveEdges() { return std::vector<Edge*>(); }
+diff --git a/src/tokenpool-gnu-make.cc b/src/tokenpool-gnu-make.cc
+index b0d3e6ebc4..4132bb06d9 100644
+--- a/src/tokenpool-gnu-make.cc
++++ b/src/tokenpool-gnu-make.cc
+@@ -1,4 +1,4 @@
+-// Copyright 2016-2017 Google Inc. All Rights Reserved.
++// Copyright 2016-2018 Google Inc. All Rights Reserved.
+ //
+ // Licensed under the Apache License, Version 2.0 (the "License");
+ // you may not use this file except in compliance with the License.
+@@ -19,6 +19,7 @@
+ #include <poll.h>
+ #include <unistd.h>
+ #include <signal.h>
++#include <sys/time.h>
+ #include <stdio.h>
+ #include <string.h>
+ #include <stdlib.h>
+@@ -153,6 +154,15 @@ bool GNUmakeTokenPool::Acquire() {
+ if (available_ > 0)
+ return true;
+
++ // Please read
++ //
++ // http://make.mad-scientist.net/papers/jobserver-implementation/
++ //
++ // for the reasoning behind the following code.
++ //
++ // Try to read one character from the pipe. Returns true on success.
++ //
++ // First check if read() would succeed without blocking.
+ #ifdef USE_PPOLL
+ pollfd pollfds[] = {{rfd_, POLLIN, 0}};
+ int ret = poll(pollfds, 1, 0);
+@@ -164,33 +174,62 @@ bool GNUmakeTokenPool::Acquire() {
+ int ret = select(rfd_ + 1, &set, NULL, NULL, &timeout);
+ #endif
+ if (ret > 0) {
++ // Handle potential race condition:
++ // - the above check succeeded, i.e. read() should not block
++ // - the character disappears before we call read()
++ //
++ // Create a duplicate of rfd_. The duplicate file descriptor dup_rfd_
++ // can safely be closed by signal handlers without affecting rfd_.
+ dup_rfd_ = dup(rfd_);
+
+ if (dup_rfd_ != -1) {
+ struct sigaction act, old_act;
+ int ret = 0;
+
++ // Temporarily replace SIGCHLD handler with our own
+ memset(&act, 0, sizeof(act));
+ act.sa_handler = CloseDupRfd;
+ if (sigaction(SIGCHLD, &act, &old_act) == 0) {
+- char buf;
+-
+- // block until token read, child exits or timeout
+- alarm(1);
+- ret = read(dup_rfd_, &buf, 1);
+- alarm(0);
++ struct itimerval timeout;
+
-+ // remove token to let DoWork() wait for command again
-+#ifndef _WIN32
-+ char token;
-+ ASSERT_EQ(1u, read(fds[0], &token, 1));
-+#endif
++ // install a 100ms timeout that generates SIGALARM on expiration
++ memset(&timeout, 0, sizeof(timeout));
++ timeout.it_value.tv_usec = 100 * 1000; // [ms] -> [usec]
++ if (setitimer(ITIMER_REAL, &timeout, NULL) == 0) {
++ char buf;
+
-+ while (!subproc->Done()) {
-+ subprocs_.DoWork(&tokens_);
-+ }
++ // Now try to read() from dup_rfd_. Return values from read():
++ //
++ // 1. token read -> 1
++ // 2. pipe closed -> 0
++ // 3. alarm expires -> -1 (EINTR)
++ // 4. child exits -> -1 (EINTR)
++ // 5. alarm expired before entering read() -> -1 (EBADF)
++ // 6. child exited before entering read() -> -1 (EBADF)
++ // 7. child exited before handler is installed -> go to 1 - 3
++ ret = read(dup_rfd_, &buf, 1);
+
-+#ifndef _WIN32
-+ close(fds[1]);
-+ close(fds[0]);
-+#endif
-+
-+ EXPECT_EQ(ExitSuccess, subproc->Finish());
-+ EXPECT_NE("", subproc->GetOutput());
-+
-+ EXPECT_EQ(1u, subprocs_.finished_.size());
-+}
-+
-+TEST_F(SubprocessTest, TokenNotAvailable) {
-+ Subprocess* subproc = subprocs_.Add(kSimpleCommand);
-+ ASSERT_NE((Subprocess *) 0, subproc);
-+
-+ // simulate GNUmake jobserver pipe with 0 tokens
-+#ifdef _WIN32
-+ tokens_._token_available = false;
-+#else
-+ int fds[2];
-+ ASSERT_EQ(0u, pipe(fds));
-+ tokens_._fd = fds[0];
-+#endif
-+
-+ subprocs_.ResetTokenAvailable();
-+ while (!subproc->Done()) {
-+ subprocs_.DoWork(&tokens_);
-+ }
-+
-+#ifndef _WIN32
-+ close(fds[1]);
-+ close(fds[0]);
-+#endif
-+
-+ EXPECT_FALSE(subprocs_.IsTokenAvailable());
-+ EXPECT_EQ(ExitSuccess, subproc->Finish());
-+ EXPECT_NE("", subproc->GetOutput());
++ // disarm timer
++ memset(&timeout, 0, sizeof(timeout));
++ setitimer(ITIMER_REAL, &timeout, NULL);
++ }
+
+ sigaction(SIGCHLD, &old_act, NULL);
+ }
+
+ CloseDupRfd(0);
+
++ // Case 1 from above list
+ if (ret > 0) {
+ available_++;
+ return true;
+ }
+ }
+ }
+
-+ EXPECT_EQ(1u, subprocs_.finished_.size());
-+}
---- /dev/null
-+++ b/src/tokenpool-gnu-make-posix.cc
-@@ -0,0 +1,202 @@
++ // read() would block, i.e. no token available,
++ // cases 2-6 from above list or
++ // select() / poll() / dup() / sigaction() / setitimer() failed
+ return false;
+ }
+
+diff --git a/src/tokenpool-none.cc b/src/tokenpool-none.cc
+index 1c1c499c8d..4c592875b4 100644
+--- a/src/tokenpool-none.cc
++++ b/src/tokenpool-none.cc
+@@ -1,4 +1,4 @@
+-// Copyright 2016-2017 Google Inc. All Rights Reserved.
+// Copyright 2016-2018 Google Inc. All Rights Reserved.
+ //
+ // Licensed under the Apache License, Version 2.0 (the "License");
+ // you may not use this file except in compliance with the License.
+@@ -14,11 +14,6 @@
+
+ #include "tokenpool.h"
+
+-#include <fcntl.h>
+-#include <poll.h>
+-#include <unistd.h>
+-#include <stdio.h>
+-#include <string.h>
+ #include <stdlib.h>
+
+ // No-op TokenPool implementation
+
+From ec6220a0baf7d3a6eaf1a2b75bf8960ddfe24c2f Mon Sep 17 00:00:00 2001
+From: Stefan Becker <chemobejk@gmail.com>
+Date: Fri, 25 May 2018 00:17:07 +0300
+Subject: [PATCH 07/11] Add tests for TokenPool
+
+- TokenPool setup
+- GetMonitorFd() API
+- implicit token and tokens in jobserver pipe
+- Acquire() / Reserve() / Release() protocol
+- Clear() API
+---
+ configure.py | 1 +
+ src/tokenpool_test.cc | 198 ++++++++++++++++++++++++++++++++++++++++++
+ 2 files changed, 199 insertions(+)
+ create mode 100644 src/tokenpool_test.cc
+
+diff --git a/configure.py b/configure.py
+index db3492c93c..dc8a0066b7 100755
+--- a/configure.py
++++ b/configure.py
+@@ -590,6 +590,7 @@ def has_re2c():
+ 'string_piece_util_test',
+ 'subprocess_test',
+ 'test',
++ 'tokenpool_test',
+ 'util_test']:
+ objs += cxx(name, variables=cxxvariables)
+ if platform.is_windows():
+diff --git a/src/tokenpool_test.cc b/src/tokenpool_test.cc
+new file mode 100644
+index 0000000000..6c89064ca4
+--- /dev/null
++++ b/src/tokenpool_test.cc
+@@ -0,0 +1,198 @@
++// Copyright 2018 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
-+#include "tokenpool-gnu-make.h"
++#include "tokenpool.h"
+
-+#include <errno.h>
-+#include <fcntl.h>
-+#include <poll.h>
-+#include <unistd.h>
-+#include <signal.h>
-+#include <sys/time.h>
++#include "test.h"
++
++#ifndef _WIN32
+#include <stdio.h>
-+#include <string.h>
+#include <stdlib.h>
++#include <unistd.h>
+
-+// TokenPool implementation for GNU make jobserver - POSIX implementation
-+// (http://make.mad-scientist.net/papers/jobserver-implementation/)
-+struct GNUmakeTokenPoolPosix : public GNUmakeTokenPool {
-+ GNUmakeTokenPoolPosix();
-+ virtual ~GNUmakeTokenPoolPosix();
++#define ENVIRONMENT_CLEAR() unsetenv("MAKEFLAGS")
++#define ENVIRONMENT_INIT(v) setenv("MAKEFLAGS", v, true);
++#endif
+
-+ virtual int GetMonitorFd();
++namespace {
+
-+ virtual const char* GetEnv(const char* name) { return getenv(name); };
-+ virtual bool ParseAuth(const char* jobserver);
-+ virtual bool AcquireToken();
-+ virtual bool ReturnToken();
++const double kLoadAverageDefault = -1.23456789;
+
-+ private:
-+ int rfd_;
-+ int wfd_;
++struct TokenPoolTest : public testing::Test {
++ double load_avg_;
++ TokenPool *tokens_;
++#ifndef _WIN32
++ char buf_[1024];
++ int fds_[2];
++#endif
+
-+ struct sigaction old_act_;
-+ bool restore_;
++ virtual void SetUp() {
++ load_avg_ = kLoadAverageDefault;
++ tokens_ = NULL;
++#ifndef _WIN32
++ ENVIRONMENT_CLEAR();
++ if (pipe(fds_) < 0)
++ ASSERT_TRUE(false);
++#endif
++ }
+
-+ static int dup_rfd_;
-+ static void CloseDupRfd(int signum);
++ void CreatePool(const char *format, bool ignore_jobserver) {
++#ifndef _WIN32
++ if (format) {
++ sprintf(buf_, format, fds_[0], fds_[1]);
++ ENVIRONMENT_INIT(buf_);
++ }
++#endif
++ tokens_ = TokenPool::Get(ignore_jobserver, false, load_avg_);
++ }
+
-+ bool CheckFd(int fd);
-+ bool SetAlarmHandler();
++ void CreateDefaultPool() {
++ CreatePool("foo --jobserver-auth=%d,%d bar", false);
++ }
++
++ virtual void TearDown() {
++ if (tokens_)
++ delete tokens_;
++#ifndef _WIN32
++ close(fds_[0]);
++ close(fds_[1]);
++ ENVIRONMENT_CLEAR();
++#endif
++ }
+};
+
-+GNUmakeTokenPoolPosix::GNUmakeTokenPoolPosix() : rfd_(-1), wfd_(-1), restore_(false) {
-+}
++} // anonymous namespace
+
-+GNUmakeTokenPoolPosix::~GNUmakeTokenPoolPosix() {
-+ Clear();
-+ if (restore_)
-+ sigaction(SIGALRM, &old_act_, NULL);
++// verifies none implementation
++TEST_F(TokenPoolTest, NoTokenPool) {
++ CreatePool(NULL, false);
++
++ EXPECT_EQ(NULL, tokens_);
++ EXPECT_EQ(kLoadAverageDefault, load_avg_);
+}
+
-+bool GNUmakeTokenPoolPosix::CheckFd(int fd) {
-+ if (fd < 0)
-+ return false;
-+ int ret = fcntl(fd, F_GETFD);
-+ if (ret < 0)
-+ return false;
-+ return true;
++#ifndef _WIN32
++TEST_F(TokenPoolTest, SuccessfulOldSetup) {
++ // GNUmake <= 4.1
++ CreatePool("foo --jobserver-fds=%d,%d bar", false);
++
++ EXPECT_NE(NULL, tokens_);
++ EXPECT_EQ(kLoadAverageDefault, load_avg_);
+}
+
-+int GNUmakeTokenPoolPosix::dup_rfd_ = -1;
++TEST_F(TokenPoolTest, SuccessfulNewSetup) {
++ // GNUmake => 4.2
++ CreateDefaultPool();
+
-+void GNUmakeTokenPoolPosix::CloseDupRfd(int signum) {
-+ close(dup_rfd_);
-+ dup_rfd_ = -1;
++ EXPECT_NE(NULL, tokens_);
++ EXPECT_EQ(kLoadAverageDefault, load_avg_);
+}
+
-+bool GNUmakeTokenPoolPosix::SetAlarmHandler() {
-+ struct sigaction act;
-+ memset(&act, 0, sizeof(act));
-+ act.sa_handler = CloseDupRfd;
-+ if (sigaction(SIGALRM, &act, &old_act_) < 0) {
-+ perror("sigaction:");
-+ return false;
-+ }
-+ restore_ = true;
-+ return true;
++TEST_F(TokenPoolTest, IgnoreWithJN) {
++ CreatePool("foo --jobserver-auth=%d,%d bar", true);
++
++ EXPECT_EQ(NULL, tokens_);
++ EXPECT_EQ(kLoadAverageDefault, load_avg_);
+}
+
-+bool GNUmakeTokenPoolPosix::ParseAuth(const char* jobserver) {
-+ int rfd = -1;
-+ int wfd = -1;
-+ if ((sscanf(jobserver, "%*[^=]=%d,%d", &rfd, &wfd) == 2) &&
-+ CheckFd(rfd) &&
-+ CheckFd(wfd) &&
-+ SetAlarmHandler()) {
-+ rfd_ = rfd;
-+ wfd_ = wfd;
-+ return true;
-+ }
++TEST_F(TokenPoolTest, HonorLN) {
++ CreatePool("foo -l9 --jobserver-auth=%d,%d bar", false);
+
-+ return false;
++ EXPECT_NE(NULL, tokens_);
++ EXPECT_EQ(9.0, load_avg_);
+}
+
-+bool GNUmakeTokenPoolPosix::AcquireToken() {
-+ // Please read
-+ //
-+ // http://make.mad-scientist.net/papers/jobserver-implementation/
-+ //
-+ // for the reasoning behind the following code.
-+ //
-+ // Try to read one character from the pipe. Returns true on success.
-+ //
-+ // First check if read() would succeed without blocking.
-+#ifdef USE_PPOLL
-+ pollfd pollfds[] = {{rfd_, POLLIN, 0}};
-+ int ret = poll(pollfds, 1, 0);
-+#else
-+ fd_set set;
-+ struct timeval timeout = { 0, 0 };
-+ FD_ZERO(&set);
-+ FD_SET(rfd_, &set);
-+ int ret = select(rfd_ + 1, &set, NULL, NULL, &timeout);
-+#endif
-+ if (ret > 0) {
-+ // Handle potential race condition:
-+ // - the above check succeeded, i.e. read() should not block
-+ // - the character disappears before we call read()
-+ //
-+ // Create a duplicate of rfd_. The duplicate file descriptor dup_rfd_
-+ // can safely be closed by signal handlers without affecting rfd_.
-+ dup_rfd_ = dup(rfd_);
++TEST_F(TokenPoolTest, MonitorFD) {
++ CreateDefaultPool();
+
-+ if (dup_rfd_ != -1) {
-+ struct sigaction act, old_act;
-+ int ret = 0;
++ ASSERT_NE(NULL, tokens_);
++ EXPECT_EQ(kLoadAverageDefault, load_avg_);
+
-+ // Temporarily replace SIGCHLD handler with our own
-+ memset(&act, 0, sizeof(act));
-+ act.sa_handler = CloseDupRfd;
-+ if (sigaction(SIGCHLD, &act, &old_act) == 0) {
-+ struct itimerval timeout;
++ EXPECT_EQ(fds_[0], tokens_->GetMonitorFd());
++}
+
-+ // install a 100ms timeout that generates SIGALARM on expiration
-+ memset(&timeout, 0, sizeof(timeout));
-+ timeout.it_value.tv_usec = 100 * 1000; // [ms] -> [usec]
-+ if (setitimer(ITIMER_REAL, &timeout, NULL) == 0) {
-+ char buf;
++TEST_F(TokenPoolTest, ImplicitToken) {
++ CreateDefaultPool();
+
-+ // Now try to read() from dup_rfd_. Return values from read():
-+ //
-+ // 1. token read -> 1
-+ // 2. pipe closed -> 0
-+ // 3. alarm expires -> -1 (EINTR)
-+ // 4. child exits -> -1 (EINTR)
-+ // 5. alarm expired before entering read() -> -1 (EBADF)
-+ // 6. child exited before entering read() -> -1 (EBADF)
-+ // 7. child exited before handler is installed -> go to 1 - 3
-+ ret = read(dup_rfd_, &buf, 1);
++ ASSERT_NE(NULL, tokens_);
++ EXPECT_EQ(kLoadAverageDefault, load_avg_);
+
-+ // disarm timer
-+ memset(&timeout, 0, sizeof(timeout));
-+ setitimer(ITIMER_REAL, &timeout, NULL);
-+ }
++ EXPECT_TRUE(tokens_->Acquire());
++ tokens_->Reserve();
++ EXPECT_FALSE(tokens_->Acquire());
++ tokens_->Release();
++ EXPECT_TRUE(tokens_->Acquire());
++}
+
-+ sigaction(SIGCHLD, &old_act, NULL);
-+ }
++TEST_F(TokenPoolTest, TwoTokens) {
++ CreateDefaultPool();
+
-+ CloseDupRfd(0);
++ ASSERT_NE(NULL, tokens_);
++ EXPECT_EQ(kLoadAverageDefault, load_avg_);
+
-+ // Case 1 from above list
-+ if (ret > 0)
-+ return true;
-+ }
-+ }
++ // implicit token
++ EXPECT_TRUE(tokens_->Acquire());
++ tokens_->Reserve();
++ EXPECT_FALSE(tokens_->Acquire());
+
-+ // read() would block, i.e. no token available,
-+ // cases 2-6 from above list or
-+ // select() / poll() / dup() / sigaction() / setitimer() failed
-+ return false;
-+}
++ // jobserver offers 2nd token
++ ASSERT_EQ(1u, write(fds_[1], "T", 1));
++ EXPECT_TRUE(tokens_->Acquire());
++ tokens_->Reserve();
++ EXPECT_FALSE(tokens_->Acquire());
+
-+bool GNUmakeTokenPoolPosix::ReturnToken() {
-+ const char buf = '+';
-+ while (1) {
-+ int ret = write(wfd_, &buf, 1);
-+ if (ret > 0)
-+ return true;
-+ if ((ret != -1) || (errno != EINTR))
-+ return false;
-+ // write got interrupted - retry
-+ }
-+}
++ // release 2nd token
++ tokens_->Release();
++ EXPECT_TRUE(tokens_->Acquire());
+
-+int GNUmakeTokenPoolPosix::GetMonitorFd() {
-+ return rfd_;
-+}
++ // release implict token - must return 2nd token back to jobserver
++ tokens_->Release();
++ EXPECT_TRUE(tokens_->Acquire());
+
-+TokenPool* TokenPool::Get() {
-+ return new GNUmakeTokenPoolPosix;
++ // there must be one token in the pipe
++ EXPECT_EQ(1u, read(fds_[0], buf_, sizeof(buf_)));
++
++ // implicit token
++ EXPECT_TRUE(tokens_->Acquire());
+}
---- /dev/null
-+++ b/src/tokenpool-gnu-make-win32.cc
-@@ -0,0 +1,239 @@
-+// Copyright 2018 Google Inc. All Rights Reserved.
-+//
-+// Licensed under the Apache License, Version 2.0 (the "License");
-+// you may not use this file except in compliance with the License.
-+// You may obtain a copy of the License at
-+//
-+// http://www.apache.org/licenses/LICENSE-2.0
-+//
-+// Unless required by applicable law or agreed to in writing, software
-+// distributed under the License is distributed on an "AS IS" BASIS,
-+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-+// See the License for the specific language governing permissions and
-+// limitations under the License.
+
-+#include "tokenpool-gnu-make.h"
++TEST_F(TokenPoolTest, Clear) {
++ CreateDefaultPool();
+
-+// Always include this first.
-+// Otherwise the other system headers don't work correctly under Win32
-+#include <windows.h>
++ ASSERT_NE(NULL, tokens_);
++ EXPECT_EQ(kLoadAverageDefault, load_avg_);
+
-+#include <ctype.h>
-+#include <stdlib.h>
-+#include <string.h>
++ // implicit token
++ EXPECT_TRUE(tokens_->Acquire());
++ tokens_->Reserve();
++ EXPECT_FALSE(tokens_->Acquire());
+
-+#include "util.h"
++ // jobserver offers 2nd & 3rd token
++ ASSERT_EQ(2u, write(fds_[1], "TT", 2));
++ EXPECT_TRUE(tokens_->Acquire());
++ tokens_->Reserve();
++ EXPECT_TRUE(tokens_->Acquire());
++ tokens_->Reserve();
++ EXPECT_FALSE(tokens_->Acquire());
+
-+// TokenPool implementation for GNU make jobserver - Win32 implementation
-+// (https://www.gnu.org/software/make/manual/html_node/Windows-Jobserver.html)
-+struct GNUmakeTokenPoolWin32 : public GNUmakeTokenPool {
-+ GNUmakeTokenPoolWin32();
-+ virtual ~GNUmakeTokenPoolWin32();
++ tokens_->Clear();
++ EXPECT_TRUE(tokens_->Acquire());
+
-+ virtual void WaitForTokenAvailability(HANDLE ioport);
-+ virtual bool TokenIsAvailable(ULONG_PTR key);
++ // there must be two tokens in the pipe
++ EXPECT_EQ(2u, read(fds_[0], buf_, sizeof(buf_)));
+
-+ virtual const char* GetEnv(const char* name);
-+ virtual bool ParseAuth(const char* jobserver);
-+ virtual bool AcquireToken();
-+ virtual bool ReturnToken();
++ // implicit token
++ EXPECT_TRUE(tokens_->Acquire());
++}
++#endif
+
+From e59d8858327126d1593fd0b8e607975a79072e92 Mon Sep 17 00:00:00 2001
+From: Stefan Becker <chemobejk@gmail.com>
+Date: Thu, 24 May 2018 18:52:45 +0300
+Subject: [PATCH 08/11] Add tests for subprocess module
+
+- add TokenPoolTest stub to provide TokenPool::GetMonitorFd()
+- add two tests
+ * both tests set up a dummy GNUmake jobserver pipe
+ * both tests call DoWork() with TokenPoolTest
+ * test 1: verify that DoWork() detects when a token is available
+ * test 2: verify that DoWork() works as before without a token
+- the tests are not compiled in under Windows
+---
+ src/subprocess_test.cc | 76 ++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 76 insertions(+)
+
+diff --git a/src/subprocess_test.cc b/src/subprocess_test.cc
+index 4bc8083e26..6264c8bf11 100644
+--- a/src/subprocess_test.cc
++++ b/src/subprocess_test.cc
+@@ -13,6 +13,7 @@
+ // limitations under the License.
+
+ #include "subprocess.h"
++#include "tokenpool.h"
+
+ #include "test.h"
+
+@@ -34,8 +35,23 @@ const char* kSimpleCommand = "cmd /c dir \\";
+ const char* kSimpleCommand = "ls /";
+ #endif
+
++struct TokenPoolTest : public TokenPool {
++ bool Acquire() { return false; }
++ void Reserve() {}
++ void Release() {}
++ void Clear() {}
+
-+ private:
-+ // Semaphore for GNU make jobserver protocol
-+ HANDLE semaphore_jobserver_;
-+ // Semaphore Child -> Parent
-+ // - child releases it before entering wait on jobserver semaphore
-+ // - parent blocks on it to know when child enters wait
-+ HANDLE semaphore_enter_wait_;
-+ // Semaphore Parent -> Child
-+ // - parent releases it to allow child to restart loop
-+ // - child blocks on it to know when to restart loop
-+ HANDLE semaphore_restart_;
-+ // set to false if child should exit loop and terminate thread
-+ bool running_;
-+ // child thread
-+ HANDLE child_;
-+ // I/O completion port from SubprocessSet
-+ HANDLE ioport_;
++#ifdef _WIN32
++ // @TODO
++#else
++ int _fd;
++ int GetMonitorFd() { return _fd; }
++#endif
++};
++
+ struct SubprocessTest : public testing::Test {
+ SubprocessSet subprocs_;
++ TokenPoolTest tokens_;
+ };
+
+ } // anonymous namespace
+@@ -280,3 +296,63 @@ TEST_F(SubprocessTest, ReadStdin) {
+ ASSERT_EQ(1u, subprocs_.finished_.size());
+ }
+ #endif // _WIN32
+
++// @TODO: remove once TokenPool implementation for Windows is available
++#ifndef _WIN32
++TEST_F(SubprocessTest, TokenAvailable) {
++ Subprocess* subproc = subprocs_.Add(kSimpleCommand);
++ ASSERT_NE((Subprocess *) 0, subproc);
+
-+ DWORD SemaphoreThread();
-+ void ReleaseSemaphore(HANDLE semaphore);
-+ void WaitForObject(HANDLE object);
-+ static DWORD WINAPI SemaphoreThreadWrapper(LPVOID param);
-+ static void NoopAPCFunc(ULONG_PTR param);
-+};
++ // simulate GNUmake jobserver pipe with 1 token
++ int fds[2];
++ ASSERT_EQ(0u, pipe(fds));
++ tokens_._fd = fds[0];
++ ASSERT_EQ(1u, write(fds[1], "T", 1));
+
-+GNUmakeTokenPoolWin32::GNUmakeTokenPoolWin32() : semaphore_jobserver_(NULL),
-+ semaphore_enter_wait_(NULL),
-+ semaphore_restart_(NULL),
-+ running_(false),
-+ child_(NULL),
-+ ioport_(NULL) {
-+}
++ subprocs_.ResetTokenAvailable();
++ subprocs_.DoWork(&tokens_);
+
-+GNUmakeTokenPoolWin32::~GNUmakeTokenPoolWin32() {
-+ Clear();
-+ CloseHandle(semaphore_jobserver_);
-+ semaphore_jobserver_ = NULL;
++ EXPECT_TRUE(subprocs_.IsTokenAvailable());
++ EXPECT_EQ(0u, subprocs_.finished_.size());
+
-+ if (child_) {
-+ // tell child thread to exit
-+ running_ = false;
-+ ReleaseSemaphore(semaphore_restart_);
++ // remove token to let DoWork() wait for command again
++ char token;
++ ASSERT_EQ(1u, read(fds[0], &token, 1));
+
-+ // wait for child thread to exit
-+ WaitForObject(child_);
-+ CloseHandle(child_);
-+ child_ = NULL;
++ while (!subproc->Done()) {
++ subprocs_.DoWork(&tokens_);
+ }
+
-+ if (semaphore_restart_) {
-+ CloseHandle(semaphore_restart_);
-+ semaphore_restart_ = NULL;
-+ }
++ close(fds[1]);
++ close(fds[0]);
+
-+ if (semaphore_enter_wait_) {
-+ CloseHandle(semaphore_enter_wait_);
-+ semaphore_enter_wait_ = NULL;
-+ }
++ EXPECT_EQ(ExitSuccess, subproc->Finish());
++ EXPECT_NE("", subproc->GetOutput());
++
++ EXPECT_EQ(1u, subprocs_.finished_.size());
+}
+
-+const char* GNUmakeTokenPoolWin32::GetEnv(const char* name) {
-+ // getenv() does not work correctly together with tokenpool_tests.cc
-+ static char buffer[MAX_PATH + 1];
-+ if (GetEnvironmentVariable(name, buffer, sizeof(buffer)) == 0)
-+ return NULL;
-+ return buffer;
-+}
-+
-+bool GNUmakeTokenPoolWin32::ParseAuth(const char* jobserver) {
-+ // match "--jobserver-auth=gmake_semaphore_<INTEGER>..."
-+ const char* start = strchr(jobserver, '=');
-+ if (start) {
-+ const char* end = start;
-+ unsigned int len;
-+ char c, *auth;
++TEST_F(SubprocessTest, TokenNotAvailable) {
++ Subprocess* subproc = subprocs_.Add(kSimpleCommand);
++ ASSERT_NE((Subprocess *) 0, subproc);
+
-+ while ((c = *++end) != '\0')
-+ if (!(isalnum(c) || (c == '_')))
-+ break;
-+ len = end - start; // includes string terminator in count
++ // simulate GNUmake jobserver pipe with 0 tokens
++ int fds[2];
++ ASSERT_EQ(0u, pipe(fds));
++ tokens_._fd = fds[0];
+
-+ if ((len > 1) && ((auth = (char*)malloc(len)) != NULL)) {
-+ strncpy(auth, start + 1, len - 1);
-+ auth[len - 1] = '\0';
++ subprocs_.ResetTokenAvailable();
++ while (!subproc->Done()) {
++ subprocs_.DoWork(&tokens_);
++ }
+
-+ if ((semaphore_jobserver_ =
-+ OpenSemaphore(SEMAPHORE_ALL_ACCESS, /* Semaphore access setting */
-+ FALSE, /* Child processes DON'T inherit */
-+ auth /* Semaphore name */
-+ )) != NULL) {
-+ free(auth);
-+ return true;
-+ }
++ close(fds[1]);
++ close(fds[0]);
+
-+ free(auth);
-+ }
-+ }
++ EXPECT_FALSE(subprocs_.IsTokenAvailable());
++ EXPECT_EQ(ExitSuccess, subproc->Finish());
++ EXPECT_NE("", subproc->GetOutput());
+
-+ return false;
++ EXPECT_EQ(1u, subprocs_.finished_.size());
+}
++#endif // _WIN32
+
+From 0145e2d4db64ea6c21aeb371928e4071f65164eb Mon Sep 17 00:00:00 2001
+From: Stefan Becker <chemobejk@gmail.com>
+Date: Sat, 26 May 2018 23:17:51 +0300
+Subject: [PATCH 09/11] Add tests for build module
+
+Add tests that verify the token functionality of the builder main loop.
+We replace the default fake command runner with a special version where
+the tests can control each call to AcquireToken(), CanRunMore() and
+WaitForCommand().
+---
+ src/build_test.cc | 364 ++++++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 364 insertions(+)
+
+diff --git a/src/build_test.cc b/src/build_test.cc
+index 7a5ff4015a..dd41dfbe1d 100644
+--- a/src/build_test.cc
++++ b/src/build_test.cc
+@@ -15,6 +15,7 @@
+ #include "build.h"
+
+ #include <assert.h>
++#include <stdarg.h>
+
+ #include "build_log.h"
+ #include "deps_log.h"
+@@ -3990,3 +3991,366 @@ TEST_F(BuildTest, ValidationWithCircularDependency) {
+ EXPECT_FALSE(builder_.AddTarget("out", &err));
+ EXPECT_EQ("dependency cycle: validate -> validate_in -> validate", err);
+ }
+
-+bool GNUmakeTokenPoolWin32::AcquireToken() {
-+ return WaitForSingleObject(semaphore_jobserver_, 0) == WAIT_OBJECT_0;
-+}
++/// The token tests are concerned with the main loop functionality when
++// the CommandRunner has an active TokenPool. It is therefore intentional
++// that the plan doesn't complete and that builder_.Build() returns false!
+
-+bool GNUmakeTokenPoolWin32::ReturnToken() {
-+ ReleaseSemaphore(semaphore_jobserver_);
-+ return true;
-+}
++/// Fake implementation of CommandRunner that simulates a TokenPool
++struct FakeTokenCommandRunner : public CommandRunner {
++ explicit FakeTokenCommandRunner() {}
+
-+DWORD GNUmakeTokenPoolWin32::SemaphoreThread() {
-+ while (running_) {
-+ // indicate to parent that we are entering wait
-+ ReleaseSemaphore(semaphore_enter_wait_);
++ // CommandRunner impl
++ virtual bool CanRunMore() const;
++ virtual bool AcquireToken();
++ virtual bool StartCommand(Edge* edge);
++ virtual bool WaitForCommand(Result* result, bool more_ready);
++ virtual vector<Edge*> GetActiveEdges();
++ virtual void Abort();
+
-+ // alertable wait forever on token semaphore
-+ if (WaitForSingleObjectEx(semaphore_jobserver_, INFINITE, TRUE) == WAIT_OBJECT_0) {
-+ // release token again for AcquireToken()
-+ ReleaseSemaphore(semaphore_jobserver_);
++ vector<string> commands_ran_;
++ vector<Edge *> edges_;
+
-+ // indicate to parent on ioport that a token might be available
-+ if (!PostQueuedCompletionStatus(ioport_, 0, (ULONG_PTR) this, NULL))
-+ Win32Fatal("PostQueuedCompletionStatus");
-+ }
++ vector<bool> acquire_token_;
++ vector<bool> can_run_more_;
++ vector<bool> wait_for_command_;
++};
+
-+ // wait for parent to allow loop restart
-+ WaitForObject(semaphore_restart_);
-+ // semaphore is now in nonsignaled state again for next run...
++bool FakeTokenCommandRunner::CanRunMore() const {
++ if (can_run_more_.size() == 0) {
++ EXPECT_FALSE("unexpected call to CommandRunner::CanRunMore()");
++ return false;
+ }
+
-+ return 0;
++ bool result = can_run_more_[0];
++
++ // Unfortunately CanRunMore() isn't "const" for tests
++ const_cast<FakeTokenCommandRunner*>(this)->can_run_more_.erase(
++ const_cast<FakeTokenCommandRunner*>(this)->can_run_more_.begin()
++ );
++
++ return result;
+}
+
-+DWORD WINAPI GNUmakeTokenPoolWin32::SemaphoreThreadWrapper(LPVOID param) {
-+ GNUmakeTokenPoolWin32* This = (GNUmakeTokenPoolWin32*) param;
-+ return This->SemaphoreThread();
++bool FakeTokenCommandRunner::AcquireToken() {
++ if (acquire_token_.size() == 0) {
++ EXPECT_FALSE("unexpected call to CommandRunner::AcquireToken()");
++ return false;
++ }
++
++ bool result = acquire_token_[0];
++ acquire_token_.erase(acquire_token_.begin());
++ return result;
+}
+
-+void GNUmakeTokenPoolWin32::NoopAPCFunc(ULONG_PTR param) {
++bool FakeTokenCommandRunner::StartCommand(Edge* edge) {
++ commands_ran_.push_back(edge->EvaluateCommand());
++ edges_.push_back(edge);
++ return true;
+}
+
-+void GNUmakeTokenPoolWin32::WaitForTokenAvailability(HANDLE ioport) {
-+ if (child_ == NULL) {
-+ // first invocation
-+ //
-+ // subprocess-win32.cc uses I/O completion port (IOCP) which can't be
-+ // used as a waitable object. Therefore we can't use WaitMultipleObjects()
-+ // to wait on the IOCP and the token semaphore at the same time. Create
-+ // a child thread that waits on the semaphore and posts an I/O completion
-+ ioport_ = ioport;
++bool FakeTokenCommandRunner::WaitForCommand(Result* result, bool more_ready) {
++ if (wait_for_command_.size() == 0) {
++ EXPECT_FALSE("unexpected call to CommandRunner::WaitForCommand()");
++ return false;
++ }
+
-+ // create both semaphores in nonsignaled state
-+ if ((semaphore_enter_wait_ = CreateSemaphore(NULL, 0, 1, NULL))
-+ == NULL)
-+ Win32Fatal("CreateSemaphore/enter_wait");
-+ if ((semaphore_restart_ = CreateSemaphore(NULL, 0, 1, NULL))
-+ == NULL)
-+ Win32Fatal("CreateSemaphore/restart");
++ bool expected = wait_for_command_[0];
++ if (expected != more_ready) {
++ EXPECT_EQ(expected, more_ready);
++ return false;
++ }
++ wait_for_command_.erase(wait_for_command_.begin());
+
-+ // start child thread
-+ running_ = true;
-+ if ((child_ = CreateThread(NULL, 0, &SemaphoreThreadWrapper, this, 0, NULL))
-+ == NULL)
-+ Win32Fatal("CreateThread");
++ if (edges_.size() == 0)
++ return false;
++
++ Edge* edge = edges_[0];
++ result->edge = edge;
+
++ if (more_ready &&
++ (edge->rule().name() == "token-available")) {
++ result->status = ExitTokenAvailable;
+ } else {
-+ // all further invocations - allow child thread to loop
-+ ReleaseSemaphore(semaphore_restart_);
++ edges_.erase(edges_.begin());
++ result->status = ExitSuccess;
+ }
+
-+ // wait for child thread to enter wait
-+ WaitForObject(semaphore_enter_wait_);
-+ // semaphore is now in nonsignaled state again for next run...
-+
-+ // now SubprocessSet::DoWork() can enter GetQueuedCompletionStatus()...
++ return true;
+}
+
-+bool GNUmakeTokenPoolWin32::TokenIsAvailable(ULONG_PTR key) {
-+ // alert child thread to break wait on token semaphore
-+ QueueUserAPC((PAPCFUNC)&NoopAPCFunc, child_, (ULONG_PTR)NULL);
-+
-+ // return true when GetQueuedCompletionStatus() returned our key
-+ return key == (ULONG_PTR) this;
++vector<Edge*> FakeTokenCommandRunner::GetActiveEdges() {
++ return edges_;
+}
+
-+void GNUmakeTokenPoolWin32::ReleaseSemaphore(HANDLE semaphore) {
-+ if (!::ReleaseSemaphore(semaphore, 1, NULL))
-+ Win32Fatal("ReleaseSemaphore");
++void FakeTokenCommandRunner::Abort() {
++ edges_.clear();
+}
+
-+void GNUmakeTokenPoolWin32::WaitForObject(HANDLE object) {
-+ if (WaitForSingleObject(object, INFINITE) != WAIT_OBJECT_0)
-+ Win32Fatal("WaitForSingleObject");
-+}
++struct BuildTokenTest : public BuildTest {
++ virtual void SetUp();
++ virtual void TearDown();
+
-+TokenPool* TokenPool::Get() {
-+ return new GNUmakeTokenPoolWin32;
-+}
---- /dev/null
-+++ b/src/tokenpool-gnu-make.cc
-@@ -0,0 +1,108 @@
-+// Copyright 2016-2018 Google Inc. All Rights Reserved.
-+//
-+// Licensed under the Apache License, Version 2.0 (the "License");
-+// you may not use this file except in compliance with the License.
-+// You may obtain a copy of the License at
-+//
-+// http://www.apache.org/licenses/LICENSE-2.0
-+//
-+// Unless required by applicable law or agreed to in writing, software
-+// distributed under the License is distributed on an "AS IS" BASIS,
-+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-+// See the License for the specific language governing permissions and
-+// limitations under the License.
++ FakeTokenCommandRunner token_command_runner_;
+
-+#include "tokenpool-gnu-make.h"
++ void ExpectAcquireToken(int count, ...);
++ void ExpectCanRunMore(int count, ...);
++ void ExpectWaitForCommand(int count, ...);
+
-+#include <stdlib.h>
-+#include <stdio.h>
-+#include <string.h>
++private:
++ void EnqueueBooleans(vector<bool>& booleans, int count, va_list ao);
++};
+
-+#include "line_printer.h"
++void BuildTokenTest::SetUp() {
++ BuildTest::SetUp();
+
-+// TokenPool implementation for GNU make jobserver - common bits
-+// every instance owns an implicit token -> available_ == 1
-+GNUmakeTokenPool::GNUmakeTokenPool() : available_(1), used_(0) {
++ // replace FakeCommandRunner with FakeTokenCommandRunner
++ builder_.command_runner_.release();
++ builder_.command_runner_.reset(&token_command_runner_);
+}
++void BuildTokenTest::TearDown() {
++ EXPECT_EQ(0u, token_command_runner_.acquire_token_.size());
++ EXPECT_EQ(0u, token_command_runner_.can_run_more_.size());
++ EXPECT_EQ(0u, token_command_runner_.wait_for_command_.size());
+
-+GNUmakeTokenPool::~GNUmakeTokenPool() {
++ BuildTest::TearDown();
+}
+
-+bool GNUmakeTokenPool::Setup(bool ignore,
-+ bool verbose,
-+ double& max_load_average) {
-+ const char* value = GetEnv("MAKEFLAGS");
-+ if (!value)
-+ return false;
-+
-+ // GNU make <= 4.1
-+ const char* jobserver = strstr(value, "--jobserver-fds=");
-+ if (!jobserver)
-+ // GNU make => 4.2
-+ jobserver = strstr(value, "--jobserver-auth=");
-+ if (jobserver) {
-+ LinePrinter printer;
-+
-+ if (ignore) {
-+ printer.PrintOnNewLine("ninja: warning: -jN forced on command line; ignoring GNU make jobserver.\n");
-+ } else {
-+ if (ParseAuth(jobserver)) {
-+ const char* l_arg = strstr(value, " -l");
-+ int load_limit = -1;
++void BuildTokenTest::ExpectAcquireToken(int count, ...) {
++ va_list ap;
++ va_start(ap, count);
++ EnqueueBooleans(token_command_runner_.acquire_token_, count, ap);
++ va_end(ap);
++}
+
-+ if (verbose) {
-+ printer.PrintOnNewLine("ninja: using GNU make jobserver.\n");
-+ }
++void BuildTokenTest::ExpectCanRunMore(int count, ...) {
++ va_list ap;
++ va_start(ap, count);
++ EnqueueBooleans(token_command_runner_.can_run_more_, count, ap);
++ va_end(ap);
++}
+
-+ // translate GNU make -lN to ninja -lN
-+ if (l_arg &&
-+ (sscanf(l_arg + 3, "%d ", &load_limit) == 1) &&
-+ (load_limit > 0)) {
-+ max_load_average = load_limit;
-+ }
++void BuildTokenTest::ExpectWaitForCommand(int count, ...) {
++ va_list ap;
++ va_start(ap, count);
++ EnqueueBooleans(token_command_runner_.wait_for_command_, count, ap);
++ va_end(ap);
++}
+
-+ return true;
-+ }
-+ }
++void BuildTokenTest::EnqueueBooleans(vector<bool>& booleans, int count, va_list ap) {
++ while (count--) {
++ int value = va_arg(ap, int);
++ booleans.push_back(!!value); // force bool
+ }
-+
-+ return false;
+}
+
-+bool GNUmakeTokenPool::Acquire() {
-+ if (available_ > 0)
-+ return true;
++TEST_F(BuildTokenTest, CompleteNoWork) {
++ // plan should not execute anything
++ string err;
+
-+ if (AcquireToken()) {
-+ // token acquired
-+ available_++;
-+ return true;
-+ }
++ EXPECT_TRUE(builder_.Build(&err));
++ EXPECT_EQ("", err);
+
-+ // no token available
-+ return false;
++ EXPECT_EQ(0u, token_command_runner_.commands_ran_.size());
+}
+
-+void GNUmakeTokenPool::Reserve() {
-+ available_--;
-+ used_++;
-+}
++TEST_F(BuildTokenTest, DoNotAquireToken) {
++ // plan should execute one command
++ string err;
++ EXPECT_TRUE(builder_.AddTarget("cat1", &err));
++ ASSERT_EQ("", err);
+
-+void GNUmakeTokenPool::Return() {
-+ if (ReturnToken())
-+ available_--;
-+}
++ // pretend we can't run anything
++ ExpectCanRunMore(1, false);
+
-+void GNUmakeTokenPool::Release() {
-+ available_++;
-+ used_--;
-+ if (available_ > 1)
-+ Return();
-+}
++ EXPECT_FALSE(builder_.Build(&err));
++ EXPECT_EQ("stuck [this is a bug]", err);
+
-+void GNUmakeTokenPool::Clear() {
-+ while (used_ > 0)
-+ Release();
-+ while (available_ > 1)
-+ Return();
++ EXPECT_EQ(0u, token_command_runner_.commands_ran_.size());
+}
---- /dev/null
-+++ b/src/tokenpool-gnu-make.h
-@@ -0,0 +1,40 @@
-+// Copyright 2016-2018 Google Inc. All Rights Reserved.
-+//
-+// Licensed under the Apache License, Version 2.0 (the "License");
-+// you may not use this file except in compliance with the License.
-+// You may obtain a copy of the License at
-+//
-+// http://www.apache.org/licenses/LICENSE-2.0
-+//
-+// Unless required by applicable law or agreed to in writing, software
-+// distributed under the License is distributed on an "AS IS" BASIS,
-+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-+// See the License for the specific language governing permissions and
-+// limitations under the License.
-+
-+#include "tokenpool.h"
+
-+// interface to GNU make token pool
-+struct GNUmakeTokenPool : public TokenPool {
-+ GNUmakeTokenPool();
-+ ~GNUmakeTokenPool();
++TEST_F(BuildTokenTest, DoNotStartWithoutToken) {
++ // plan should execute one command
++ string err;
++ EXPECT_TRUE(builder_.AddTarget("cat1", &err));
++ ASSERT_EQ("", err);
+
-+ // token pool implementation
-+ virtual bool Acquire();
-+ virtual void Reserve();
-+ virtual void Release();
-+ virtual void Clear();
-+ virtual bool Setup(bool ignore, bool verbose, double& max_load_average);
++ // we could run a command but do not have a token for it
++ ExpectCanRunMore(1, true);
++ ExpectAcquireToken(1, false);
+
-+ // platform specific implementation
-+ virtual const char* GetEnv(const char* name) = 0;
-+ virtual bool ParseAuth(const char* jobserver) = 0;
-+ virtual bool AcquireToken() = 0;
-+ virtual bool ReturnToken() = 0;
++ EXPECT_FALSE(builder_.Build(&err));
++ EXPECT_EQ("stuck [this is a bug]", err);
+
-+ private:
-+ int available_;
-+ int used_;
++ EXPECT_EQ(0u, token_command_runner_.commands_ran_.size());
++}
+
-+ void Return();
-+};
---- /dev/null
-+++ b/src/tokenpool.h
-@@ -0,0 +1,42 @@
-+// Copyright 2016-2018 Google Inc. All Rights Reserved.
-+//
-+// Licensed under the Apache License, Version 2.0 (the "License");
-+// you may not use this file except in compliance with the License.
-+// You may obtain a copy of the License at
-+//
-+// http://www.apache.org/licenses/LICENSE-2.0
-+//
-+// Unless required by applicable law or agreed to in writing, software
-+// distributed under the License is distributed on an "AS IS" BASIS,
-+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-+// See the License for the specific language governing permissions and
-+// limitations under the License.
++TEST_F(BuildTokenTest, CompleteOneStep) {
++ // plan should execute one command
++ string err;
++ EXPECT_TRUE(builder_.AddTarget("cat1", &err));
++ ASSERT_EQ("", err);
+
-+#ifdef _WIN32
-+#include <windows.h>
-+#endif
++ // allow running of one command
++ ExpectCanRunMore(1, true);
++ ExpectAcquireToken(1, true);
++ // block and wait for command to finalize
++ ExpectWaitForCommand(1, false);
+
-+// interface to token pool
-+struct TokenPool {
-+ virtual ~TokenPool() {}
++ EXPECT_TRUE(builder_.Build(&err));
++ EXPECT_EQ("", err);
+
-+ virtual bool Acquire() = 0;
-+ virtual void Reserve() = 0;
-+ virtual void Release() = 0;
-+ virtual void Clear() = 0;
++ EXPECT_EQ(1u, token_command_runner_.commands_ran_.size());
++ EXPECT_TRUE(token_command_runner_.commands_ran_[0] == "cat in1 > cat1");
++}
+
-+ // returns false if token pool setup failed
-+ virtual bool Setup(bool ignore, bool verbose, double& max_load_average) = 0;
++TEST_F(BuildTokenTest, AcquireOneToken) {
++ // plan should execute more than one command
++ string err;
++ EXPECT_TRUE(builder_.AddTarget("cat12", &err));
++ ASSERT_EQ("", err);
+
-+#ifdef _WIN32
-+ virtual void WaitForTokenAvailability(HANDLE ioport) = 0;
-+ // returns true if a token has become available
-+ // key is result from GetQueuedCompletionStatus()
-+ virtual bool TokenIsAvailable(ULONG_PTR key) = 0;
-+#else
-+ virtual int GetMonitorFd() = 0;
-+#endif
++ // allow running of one command
++ ExpectCanRunMore(3, true, false, false);
++ ExpectAcquireToken(1, true);
++ // block and wait for command to finalize
++ ExpectWaitForCommand(1, false);
+
-+ // returns NULL if token pool is not available
-+ static TokenPool* Get();
-+};
---- /dev/null
-+++ b/src/tokenpool_test.cc
-@@ -0,0 +1,269 @@
-+// Copyright 2018 Google Inc. All Rights Reserved.
-+//
-+// Licensed under the Apache License, Version 2.0 (the "License");
-+// you may not use this file except in compliance with the License.
-+// You may obtain a copy of the License at
-+//
-+// http://www.apache.org/licenses/LICENSE-2.0
-+//
-+// Unless required by applicable law or agreed to in writing, software
-+// distributed under the License is distributed on an "AS IS" BASIS,
-+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-+// See the License for the specific language governing permissions and
-+// limitations under the License.
++ EXPECT_FALSE(builder_.Build(&err));
++ EXPECT_EQ("stuck [this is a bug]", err);
+
-+#include "tokenpool.h"
++ EXPECT_EQ(1u, token_command_runner_.commands_ran_.size());
++ // any of the two dependencies could have been executed
++ EXPECT_TRUE(token_command_runner_.commands_ran_[0] == "cat in1 > cat1" ||
++ token_command_runner_.commands_ran_[0] == "cat in1 in2 > cat2");
++}
+
-+#include "test.h"
++TEST_F(BuildTokenTest, WantTwoTokens) {
++ // plan should execute more than one command
++ string err;
++ EXPECT_TRUE(builder_.AddTarget("cat12", &err));
++ ASSERT_EQ("", err);
+
-+#ifdef _WIN32
-+#include <windows.h>
-+#else
-+#include <unistd.h>
-+#endif
++ // allow running of one command
++ ExpectCanRunMore(3, true, true, false);
++ ExpectAcquireToken(2, true, false);
++ // wait for command to finalize or token to become available
++ ExpectWaitForCommand(1, true);
+
-+#include <stdio.h>
-+#include <stdlib.h>
++ EXPECT_FALSE(builder_.Build(&err));
++ EXPECT_EQ("stuck [this is a bug]", err);
+
-+#ifdef _WIN32
-+// should contain all valid characters
-+#define SEMAPHORE_NAME "abcdefghijklmnopqrstwxyz01234567890_"
-+#define AUTH_FORMAT(tmpl) "foo " tmpl "=%s bar"
-+#define ENVIRONMENT_CLEAR() SetEnvironmentVariable("MAKEFLAGS", NULL)
-+#define ENVIRONMENT_INIT(v) SetEnvironmentVariable("MAKEFLAGS", v)
-+#else
-+#define AUTH_FORMAT(tmpl) "foo " tmpl "=%d,%d bar"
-+#define ENVIRONMENT_CLEAR() unsetenv("MAKEFLAGS")
-+#define ENVIRONMENT_INIT(v) setenv("MAKEFLAGS", v, true)
-+#endif
-+
-+namespace {
-+
-+const double kLoadAverageDefault = -1.23456789;
-+
-+struct TokenPoolTest : public testing::Test {
-+ double load_avg_;
-+ TokenPool* tokens_;
-+ char buf_[1024];
-+#ifdef _WIN32
-+ const char* semaphore_name_;
-+ HANDLE semaphore_;
-+#else
-+ int fds_[2];
-+#endif
-+
-+ virtual void SetUp() {
-+ load_avg_ = kLoadAverageDefault;
-+ tokens_ = NULL;
-+ ENVIRONMENT_CLEAR();
-+#ifdef _WIN32
-+ semaphore_name_ = SEMAPHORE_NAME;
-+ if ((semaphore_ = CreateSemaphore(0, 0, 2, SEMAPHORE_NAME)) == NULL)
-+#else
-+ if (pipe(fds_) < 0)
-+#endif
-+ ASSERT_TRUE(false);
-+ }
-+
-+ void CreatePool(const char* format, bool ignore_jobserver = false) {
-+ if (format) {
-+ sprintf(buf_, format,
-+#ifdef _WIN32
-+ semaphore_name_
-+#else
-+ fds_[0], fds_[1]
-+#endif
-+ );
-+ ENVIRONMENT_INIT(buf_);
-+ }
-+ if ((tokens_ = TokenPool::Get()) != NULL) {
-+ if (!tokens_->Setup(ignore_jobserver, false, load_avg_)) {
-+ delete tokens_;
-+ tokens_ = NULL;
-+ }
-+ }
-+ }
-+
-+ void CreateDefaultPool() {
-+ CreatePool(AUTH_FORMAT("--jobserver-auth"));
-+ }
-+
-+ virtual void TearDown() {
-+ if (tokens_)
-+ delete tokens_;
-+#ifdef _WIN32
-+ CloseHandle(semaphore_);
-+#else
-+ close(fds_[0]);
-+ close(fds_[1]);
-+#endif
-+ ENVIRONMENT_CLEAR();
-+ }
-+};
-+
-+} // anonymous namespace
-+
-+// verifies none implementation
-+TEST_F(TokenPoolTest, NoTokenPool) {
-+ CreatePool(NULL, false);
-+
-+ EXPECT_EQ(NULL, tokens_);
-+ EXPECT_EQ(kLoadAverageDefault, load_avg_);
-+}
-+
-+TEST_F(TokenPoolTest, SuccessfulOldSetup) {
-+ // GNUmake <= 4.1
-+ CreatePool(AUTH_FORMAT("--jobserver-fds"));
-+
-+ EXPECT_NE(NULL, tokens_);
-+ EXPECT_EQ(kLoadAverageDefault, load_avg_);
++ EXPECT_EQ(1u, token_command_runner_.commands_ran_.size());
++ // any of the two dependencies could have been executed
++ EXPECT_TRUE(token_command_runner_.commands_ran_[0] == "cat in1 > cat1" ||
++ token_command_runner_.commands_ran_[0] == "cat in1 in2 > cat2");
+}
+
-+TEST_F(TokenPoolTest, SuccessfulNewSetup) {
-+ // GNUmake => 4.2
-+ CreateDefaultPool();
-+
-+ EXPECT_NE(NULL, tokens_);
-+ EXPECT_EQ(kLoadAverageDefault, load_avg_);
-+}
++TEST_F(BuildTokenTest, CompleteTwoSteps) {
++ ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
++"build out1: cat in1\n"
++"build out2: cat out1\n"));
+
-+TEST_F(TokenPoolTest, IgnoreWithJN) {
-+ CreatePool(AUTH_FORMAT("--jobserver-auth"), true);
++ // plan should execute more than one command
++ string err;
++ EXPECT_TRUE(builder_.AddTarget("out2", &err));
++ ASSERT_EQ("", err);
+
-+ EXPECT_EQ(NULL, tokens_);
-+ EXPECT_EQ(kLoadAverageDefault, load_avg_);
-+}
++ // allow running of two commands
++ ExpectCanRunMore(2, true, true);
++ ExpectAcquireToken(2, true, true);
++ // wait for commands to finalize
++ ExpectWaitForCommand(2, false, false);
+
-+TEST_F(TokenPoolTest, HonorLN) {
-+ CreatePool(AUTH_FORMAT("-l9 --jobserver-auth"));
++ EXPECT_TRUE(builder_.Build(&err));
++ EXPECT_EQ("", err);
+
-+ EXPECT_NE(NULL, tokens_);
-+ EXPECT_EQ(9.0, load_avg_);
++ EXPECT_EQ(2u, token_command_runner_.commands_ran_.size());
++ EXPECT_TRUE(token_command_runner_.commands_ran_[0] == "cat in1 > out1");
++ EXPECT_TRUE(token_command_runner_.commands_ran_[1] == "cat out1 > out2");
+}
+
-+#ifdef _WIN32
-+TEST_F(TokenPoolTest, SemaphoreNotFound) {
-+ semaphore_name_ = SEMAPHORE_NAME "_foobar";
-+ CreateDefaultPool();
++TEST_F(BuildTokenTest, TwoCommandsInParallel) {
++ ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
++"rule token-available\n"
++" command = cat $in > $out\n"
++"build out1: token-available in1\n"
++"build out2: token-available in2\n"
++"build out12: cat out1 out2\n"));
+
-+ EXPECT_EQ(NULL, tokens_);
-+ EXPECT_EQ(kLoadAverageDefault, load_avg_);
-+}
++ // plan should execute more than one command
++ string err;
++ EXPECT_TRUE(builder_.AddTarget("out12", &err));
++ ASSERT_EQ("", err);
+
-+TEST_F(TokenPoolTest, TokenIsAvailable) {
-+ CreateDefaultPool();
++ // 1st command: token available -> allow running
++ // 2nd command: no token available but becomes available later
++ ExpectCanRunMore(4, true, true, true, false);
++ ExpectAcquireToken(3, true, false, true);
++ // 1st call waits for command to finalize or token to become available
++ // 2nd call waits for command to finalize
++ // 3rd call waits for command to finalize
++ ExpectWaitForCommand(3, true, false, false);
+
-+ ASSERT_NE(NULL, tokens_);
-+ EXPECT_EQ(kLoadAverageDefault, load_avg_);
++ EXPECT_FALSE(builder_.Build(&err));
++ EXPECT_EQ("stuck [this is a bug]", err);
+
-+ EXPECT_TRUE(tokens_->TokenIsAvailable((ULONG_PTR)tokens_));
++ EXPECT_EQ(2u, token_command_runner_.commands_ran_.size());
++ EXPECT_TRUE((token_command_runner_.commands_ran_[0] == "cat in1 > out1" &&
++ token_command_runner_.commands_ran_[1] == "cat in2 > out2") ||
++ (token_command_runner_.commands_ran_[0] == "cat in2 > out2" &&
++ token_command_runner_.commands_ran_[1] == "cat in1 > out1"));
+}
-+#else
-+TEST_F(TokenPoolTest, MonitorFD) {
-+ CreateDefaultPool();
+
-+ ASSERT_NE(NULL, tokens_);
-+ EXPECT_EQ(kLoadAverageDefault, load_avg_);
-+
-+ EXPECT_EQ(fds_[0], tokens_->GetMonitorFd());
-+}
-+#endif
++TEST_F(BuildTokenTest, CompleteThreeStepsSerial) {
++ // plan should execute more than one command
++ string err;
++ EXPECT_TRUE(builder_.AddTarget("cat12", &err));
++ ASSERT_EQ("", err);
+
-+TEST_F(TokenPoolTest, ImplicitToken) {
-+ CreateDefaultPool();
++ // allow running of all commands
++ ExpectCanRunMore(4, true, true, true, true);
++ ExpectAcquireToken(4, true, false, true, true);
++ // wait for commands to finalize
++ ExpectWaitForCommand(3, true, false, false);
+
-+ ASSERT_NE(NULL, tokens_);
-+ EXPECT_EQ(kLoadAverageDefault, load_avg_);
++ EXPECT_TRUE(builder_.Build(&err));
++ EXPECT_EQ("", err);
+
-+ EXPECT_TRUE(tokens_->Acquire());
-+ tokens_->Reserve();
-+ EXPECT_FALSE(tokens_->Acquire());
-+ tokens_->Release();
-+ EXPECT_TRUE(tokens_->Acquire());
++ EXPECT_EQ(3u, token_command_runner_.commands_ran_.size());
++ EXPECT_TRUE((token_command_runner_.commands_ran_[0] == "cat in1 > cat1" &&
++ token_command_runner_.commands_ran_[1] == "cat in1 in2 > cat2") ||
++ (token_command_runner_.commands_ran_[0] == "cat in1 in2 > cat2" &&
++ token_command_runner_.commands_ran_[1] == "cat in1 > cat1" ));
++ EXPECT_TRUE(token_command_runner_.commands_ran_[2] == "cat cat1 cat2 > cat12");
+}
+
-+TEST_F(TokenPoolTest, TwoTokens) {
-+ CreateDefaultPool();
-+
-+ ASSERT_NE(NULL, tokens_);
-+ EXPECT_EQ(kLoadAverageDefault, load_avg_);
-+
-+ // implicit token
-+ EXPECT_TRUE(tokens_->Acquire());
-+ tokens_->Reserve();
-+ EXPECT_FALSE(tokens_->Acquire());
-+
-+ // jobserver offers 2nd token
-+#ifdef _WIN32
-+ LONG previous;
-+ ASSERT_TRUE(ReleaseSemaphore(semaphore_, 1, &previous));
-+ ASSERT_EQ(0, previous);
-+#else
-+ ASSERT_EQ(1u, write(fds_[1], "T", 1));
-+#endif
-+ EXPECT_TRUE(tokens_->Acquire());
-+ tokens_->Reserve();
-+ EXPECT_FALSE(tokens_->Acquire());
++TEST_F(BuildTokenTest, CompleteThreeStepsParallel) {
++ ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
++"rule token-available\n"
++" command = cat $in > $out\n"
++"build out1: token-available in1\n"
++"build out2: token-available in2\n"
++"build out12: cat out1 out2\n"));
+
-+ // release 2nd token
-+ tokens_->Release();
-+ EXPECT_TRUE(tokens_->Acquire());
++ // plan should execute more than one command
++ string err;
++ EXPECT_TRUE(builder_.AddTarget("out12", &err));
++ ASSERT_EQ("", err);
+
-+ // release implict token - must return 2nd token back to jobserver
-+ tokens_->Release();
-+ EXPECT_TRUE(tokens_->Acquire());
++ // allow running of all commands
++ ExpectCanRunMore(4, true, true, true, true);
++ ExpectAcquireToken(4, true, false, true, true);
++ // wait for commands to finalize
++ ExpectWaitForCommand(4, true, false, false, false);
+
-+ // there must be one token available
-+#ifdef _WIN32
-+ EXPECT_EQ(WAIT_OBJECT_0, WaitForSingleObject(semaphore_, 0));
-+ EXPECT_TRUE(ReleaseSemaphore(semaphore_, 1, &previous));
-+ EXPECT_EQ(0, previous);
-+#else
-+ EXPECT_EQ(1u, read(fds_[0], buf_, sizeof(buf_)));
-+#endif
++ EXPECT_TRUE(builder_.Build(&err));
++ EXPECT_EQ("", err);
+
-+ // implicit token
-+ EXPECT_TRUE(tokens_->Acquire());
++ EXPECT_EQ(3u, token_command_runner_.commands_ran_.size());
++ EXPECT_TRUE((token_command_runner_.commands_ran_[0] == "cat in1 > out1" &&
++ token_command_runner_.commands_ran_[1] == "cat in2 > out2") ||
++ (token_command_runner_.commands_ran_[0] == "cat in2 > out2" &&
++ token_command_runner_.commands_ran_[1] == "cat in1 > out1"));
++ EXPECT_TRUE(token_command_runner_.commands_ran_[2] == "cat out1 out2 > out12");
+}
+
+From f016e5430c9123d34a73ea7ad28693b20ee59d6d Mon Sep 17 00:00:00 2001
+From: Stefan Becker <chemobejk@gmail.com>
+Date: Mon, 8 Oct 2018 17:47:50 +0300
+Subject: [PATCH 10/11] Add Win32 implementation for GNUmakeTokenPool
+
+GNU make uses a semaphore as jobserver protocol on Win32. See also
+
+ https://www.gnu.org/software/make/manual/html_node/Windows-Jobserver.html
+
+Usage is pretty simple and straightforward, i.e. WaitForSingleObject()
+to obtain a token and ReleaseSemaphore() to return it.
+
+Unfortunately subprocess-win32.cc uses an I/O completion port (IOCP).
+IOCPs aren't waitable objects, i.e. we can't use WaitForMultipleObjects()
+to wait on the IOCP and the token semaphore at the same time.
+
+Therefore GNUmakeTokenPoolWin32 creates a child thread that waits on the
+token semaphore and posts a dummy I/O completion status on the IOCP when
+it was able to obtain a token. That unblocks SubprocessSet::DoWork() and
+it can then check if a token became available or not.
+
+- split existing GNUmakeTokenPool into common and platform bits
+- add GNUmakeTokenPool interface
+- move the Posix bits to GNUmakeTokenPoolPosix
+- add the Win32 bits as GNUmakeTokenPoolWin32
+- move Setup() method up to TokenPool interface
+- update Subprocess & TokenPool tests accordingly
+---
+ configure.py | 8 +-
+ src/build.cc | 11 +-
+ src/subprocess-win32.cc | 9 ++
+ src/subprocess_test.cc | 34 ++++-
+ src/tokenpool-gnu-make-posix.cc | 203 +++++++++++++++++++++++++++
+ src/tokenpool-gnu-make-win32.cc | 237 ++++++++++++++++++++++++++++++++
+ src/tokenpool-gnu-make.cc | 203 ++-------------------------
+ src/tokenpool-gnu-make.h | 40 ++++++
+ src/tokenpool-none.cc | 4 +-
+ src/tokenpool.h | 18 ++-
+ src/tokenpool_test.cc | 113 ++++++++++++---
+ 11 files changed, 653 insertions(+), 227 deletions(-)
+ create mode 100644 src/tokenpool-gnu-make-posix.cc
+ create mode 100644 src/tokenpool-gnu-make-win32.cc
+ create mode 100644 src/tokenpool-gnu-make.h
+
+diff --git a/configure.py b/configure.py
+index dc8a0066b7..a239b90eef 100755
+--- a/configure.py
++++ b/configure.py
+@@ -517,12 +517,13 @@ def has_re2c():
+ 'state',
+ 'status',
+ 'string_piece_util',
++ 'tokenpool-gnu-make',
+ 'util',
+ 'version']:
+ objs += cxx(name, variables=cxxvariables)
+ if platform.is_windows():
+ for name in ['subprocess-win32',
+- 'tokenpool-none',
++ 'tokenpool-gnu-make-win32',
+ 'includes_normalize-win32',
+ 'msvc_helper-win32',
+ 'msvc_helper_main-win32']:
+@@ -531,8 +532,9 @@ def has_re2c():
+ objs += cxx('minidump-win32', variables=cxxvariables)
+ objs += cc('getopt')
+ else:
+- objs += cxx('subprocess-posix')
+- objs += cxx('tokenpool-gnu-make')
++ for name in ['subprocess-posix',
++ 'tokenpool-gnu-make-posix']:
++ objs += cxx(name)
+ if platform.is_aix():
+ objs += cc('getopt')
+ if platform.is_msvc():
+diff --git a/src/build.cc b/src/build.cc
+index 662e4bd7be..20c3bdc2a0 100644
+--- a/src/build.cc
++++ b/src/build.cc
+@@ -473,9 +473,14 @@ struct RealCommandRunner : public CommandRunner {
+
+ RealCommandRunner::RealCommandRunner(const BuildConfig& config) : config_(config) {
+ max_load_average_ = config.max_load_average;
+- tokens_ = TokenPool::Get(config_.parallelism_from_cmdline,
+- config_.verbosity == BuildConfig::VERBOSE,
+- max_load_average_);
++ if ((tokens_ = TokenPool::Get()) != NULL) {
++ if (!tokens_->Setup(config_.parallelism_from_cmdline,
++ config_.verbosity == BuildConfig::VERBOSE,
++ max_load_average_)) {
++ delete tokens_;
++ tokens_ = NULL;
++ }
++ }
+ }
+
+ RealCommandRunner::~RealCommandRunner() {
+diff --git a/src/subprocess-win32.cc b/src/subprocess-win32.cc
+index 66d2c2c430..ce3e2c20a4 100644
+--- a/src/subprocess-win32.cc
++++ b/src/subprocess-win32.cc
+@@ -13,6 +13,7 @@
+ // limitations under the License.
+
+ #include "subprocess.h"
++#include "tokenpool.h"
+
+ #include <assert.h>
+ #include <stdio.h>
+@@ -256,6 +257,9 @@ bool SubprocessSet::DoWork(struct TokenPool* tokens) {
+ Subprocess* subproc;
+ OVERLAPPED* overlapped;
+
++ if (tokens)
++ tokens->WaitForTokenAvailability(ioport_);
+
-+TEST_F(TokenPoolTest, Clear) {
-+ CreateDefaultPool();
-+
-+ ASSERT_NE(NULL, tokens_);
-+ EXPECT_EQ(kLoadAverageDefault, load_avg_);
-+
-+ // implicit token
-+ EXPECT_TRUE(tokens_->Acquire());
-+ tokens_->Reserve();
-+ EXPECT_FALSE(tokens_->Acquire());
+ if (!GetQueuedCompletionStatus(ioport_, &bytes_read, (PULONG_PTR)&subproc,
+ &overlapped, INFINITE)) {
+ if (GetLastError() != ERROR_BROKEN_PIPE)
+@@ -266,6 +270,11 @@ bool SubprocessSet::DoWork(struct TokenPool* tokens) {
+ // delivered by NotifyInterrupted above.
+ return true;
+
++ if (tokens && tokens->TokenIsAvailable((ULONG_PTR)subproc)) {
++ token_available_ = true;
++ return false;
++ }
+
-+ // jobserver offers 2nd & 3rd token
+ subproc->OnPipeReady();
+
+ if (subproc->Done()) {
+diff --git a/src/subprocess_test.cc b/src/subprocess_test.cc
+index 6264c8bf11..f625963462 100644
+--- a/src/subprocess_test.cc
++++ b/src/subprocess_test.cc
+@@ -40,9 +40,16 @@ struct TokenPoolTest : public TokenPool {
+ void Reserve() {}
+ void Release() {}
+ void Clear() {}
++ bool Setup(bool ignore_unused, bool verbose, double& max_load_average) { return false; }
+
+ #ifdef _WIN32
+- // @TODO
++ bool _token_available;
++ void WaitForTokenAvailability(HANDLE ioport) {
++ if (_token_available)
++ // unblock GetQueuedCompletionStatus()
++ PostQueuedCompletionStatus(ioport, 0, (ULONG_PTR) this, NULL);
++ }
++ bool TokenIsAvailable(ULONG_PTR key) { return key == (ULONG_PTR) this; }
+ #else
+ int _fd;
+ int GetMonitorFd() { return _fd; }
+@@ -297,34 +304,48 @@ TEST_F(SubprocessTest, ReadStdin) {
+ }
+ #endif // _WIN32
+
+-// @TODO: remove once TokenPool implementation for Windows is available
+-#ifndef _WIN32
+ TEST_F(SubprocessTest, TokenAvailable) {
+ Subprocess* subproc = subprocs_.Add(kSimpleCommand);
+ ASSERT_NE((Subprocess *) 0, subproc);
+
+ // simulate GNUmake jobserver pipe with 1 token
+#ifdef _WIN32
-+ LONG previous;
-+ ASSERT_TRUE(ReleaseSemaphore(semaphore_, 2, &previous));
-+ ASSERT_EQ(0, previous);
++ tokens_._token_available = true;
+#else
-+ ASSERT_EQ(2u, write(fds_[1], "TT", 2));
+ int fds[2];
+ ASSERT_EQ(0u, pipe(fds));
+ tokens_._fd = fds[0];
+ ASSERT_EQ(1u, write(fds[1], "T", 1));
+#endif
-+ EXPECT_TRUE(tokens_->Acquire());
-+ tokens_->Reserve();
-+ EXPECT_TRUE(tokens_->Acquire());
-+ tokens_->Reserve();
-+ EXPECT_FALSE(tokens_->Acquire());
-+
-+ tokens_->Clear();
-+ EXPECT_TRUE(tokens_->Acquire());
-+
-+ // there must be two tokens available
+
+ subprocs_.ResetTokenAvailable();
+ subprocs_.DoWork(&tokens_);
+#ifdef _WIN32
-+ EXPECT_EQ(WAIT_OBJECT_0, WaitForSingleObject(semaphore_, 0));
-+ EXPECT_EQ(WAIT_OBJECT_0, WaitForSingleObject(semaphore_, 0));
-+ EXPECT_TRUE(ReleaseSemaphore(semaphore_, 2, &previous));
-+ EXPECT_EQ(0, previous);
++ tokens_._token_available = false;
++ // we need to loop here as we have no conrol where the token
++ // I/O completion post ends up in the queue
++ while (!subproc->Done() && !subprocs_.IsTokenAvailable()) {
++ subprocs_.DoWork(&tokens_);
++ }
++#endif
+
+ EXPECT_TRUE(subprocs_.IsTokenAvailable());
+ EXPECT_EQ(0u, subprocs_.finished_.size());
+
+ // remove token to let DoWork() wait for command again
++#ifndef _WIN32
+ char token;
+ ASSERT_EQ(1u, read(fds[0], &token, 1));
++#endif
+
+ while (!subproc->Done()) {
+ subprocs_.DoWork(&tokens_);
+ }
+
++#ifndef _WIN32
+ close(fds[1]);
+ close(fds[0]);
++#endif
+
+ EXPECT_EQ(ExitSuccess, subproc->Finish());
+ EXPECT_NE("", subproc->GetOutput());
+@@ -337,17 +358,23 @@ TEST_F(SubprocessTest, TokenNotAvailable) {
+ ASSERT_NE((Subprocess *) 0, subproc);
+
+ // simulate GNUmake jobserver pipe with 0 tokens
++#ifdef _WIN32
++ tokens_._token_available = false;
+#else
-+ EXPECT_EQ(2u, read(fds_[0], buf_, sizeof(buf_)));
+ int fds[2];
+ ASSERT_EQ(0u, pipe(fds));
+ tokens_._fd = fds[0];
++#endif
+
+ subprocs_.ResetTokenAvailable();
+ while (!subproc->Done()) {
+ subprocs_.DoWork(&tokens_);
+ }
+
++#ifndef _WIN32
+ close(fds[1]);
+ close(fds[0]);
+#endif
+
+ EXPECT_FALSE(subprocs_.IsTokenAvailable());
+ EXPECT_EQ(ExitSuccess, subproc->Finish());
+@@ -355,4 +382,3 @@ TEST_F(SubprocessTest, TokenNotAvailable) {
+
+ EXPECT_EQ(1u, subprocs_.finished_.size());
+ }
+-#endif // _WIN32
+diff --git a/src/tokenpool-gnu-make-posix.cc b/src/tokenpool-gnu-make-posix.cc
+new file mode 100644
+index 0000000000..70d84bfff7
+--- /dev/null
++++ b/src/tokenpool-gnu-make-posix.cc
+@@ -0,0 +1,203 @@
++// Copyright 2016-2018 Google Inc. All Rights Reserved.
++//
++// Licensed under the Apache License, Version 2.0 (the "License");
++// you may not use this file except in compliance with the License.
++// You may obtain a copy of the License at
++//
++// http://www.apache.org/licenses/LICENSE-2.0
++//
++// Unless required by applicable law or agreed to in writing, software
++// distributed under the License is distributed on an "AS IS" BASIS,
++// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++// See the License for the specific language governing permissions and
++// limitations under the License.
+
-+ // implicit token
-+ EXPECT_TRUE(tokens_->Acquire());
++#include "tokenpool-gnu-make.h"
++
++#include <errno.h>
++#include <fcntl.h>
++#include <poll.h>
++#include <unistd.h>
++#include <signal.h>
++#include <sys/time.h>
++#include <stdio.h>
++#include <string.h>
++#include <stdlib.h>
++
++// TokenPool implementation for GNU make jobserver - POSIX implementation
++// (http://make.mad-scientist.net/papers/jobserver-implementation/)
++struct GNUmakeTokenPoolPosix : public GNUmakeTokenPool {
++ GNUmakeTokenPoolPosix();
++ virtual ~GNUmakeTokenPoolPosix();
++
++ virtual int GetMonitorFd();
++
++ virtual const char *GetEnv(const char *name) { return getenv(name); };
++ virtual bool ParseAuth(const char *jobserver);
++ virtual bool AcquireToken();
++ virtual bool ReturnToken();
++
++ private:
++ int rfd_;
++ int wfd_;
++
++ struct sigaction old_act_;
++ bool restore_;
++
++ static int dup_rfd_;
++ static void CloseDupRfd(int signum);
++
++ bool CheckFd(int fd);
++ bool SetAlarmHandler();
++};
++
++GNUmakeTokenPoolPosix::GNUmakeTokenPoolPosix() : rfd_(-1), wfd_(-1), restore_(false) {
++}
++
++GNUmakeTokenPoolPosix::~GNUmakeTokenPoolPosix() {
++ Clear();
++ if (restore_)
++ sigaction(SIGALRM, &old_act_, NULL);
++}
++
++bool GNUmakeTokenPoolPosix::CheckFd(int fd) {
++ if (fd < 0)
++ return false;
++ int ret = fcntl(fd, F_GETFD);
++ if (ret < 0)
++ return false;
++ return true;
+}
++
++int GNUmakeTokenPoolPosix::dup_rfd_ = -1;
++
++void GNUmakeTokenPoolPosix::CloseDupRfd(int signum) {
++ close(dup_rfd_);
++ dup_rfd_ = -1;
++}
++
++bool GNUmakeTokenPoolPosix::SetAlarmHandler() {
++ struct sigaction act;
++ memset(&act, 0, sizeof(act));
++ act.sa_handler = CloseDupRfd;
++ if (sigaction(SIGALRM, &act, &old_act_) < 0) {
++ perror("sigaction:");
++ return(false);
++ } else {
++ restore_ = true;
++ return(true);
++ }
++}
++
++bool GNUmakeTokenPoolPosix::ParseAuth(const char *jobserver) {
++ int rfd = -1;
++ int wfd = -1;
++ if ((sscanf(jobserver, "%*[^=]=%d,%d", &rfd, &wfd) == 2) &&
++ CheckFd(rfd) &&
++ CheckFd(wfd) &&
++ SetAlarmHandler()) {
++ rfd_ = rfd;
++ wfd_ = wfd;
++ return true;
++ }
++
++ return false;
++}
++
++bool GNUmakeTokenPoolPosix::AcquireToken() {
++ // Please read
++ //
++ // http://make.mad-scientist.net/papers/jobserver-implementation/
++ //
++ // for the reasoning behind the following code.
++ //
++ // Try to read one character from the pipe. Returns true on success.
++ //
++ // First check if read() would succeed without blocking.
++#ifdef USE_PPOLL
++ pollfd pollfds[] = {{rfd_, POLLIN, 0}};
++ int ret = poll(pollfds, 1, 0);
++#else
++ fd_set set;
++ struct timeval timeout = { 0, 0 };
++ FD_ZERO(&set);
++ FD_SET(rfd_, &set);
++ int ret = select(rfd_ + 1, &set, NULL, NULL, &timeout);
++#endif
++ if (ret > 0) {
++ // Handle potential race condition:
++ // - the above check succeeded, i.e. read() should not block
++ // - the character disappears before we call read()
++ //
++ // Create a duplicate of rfd_. The duplicate file descriptor dup_rfd_
++ // can safely be closed by signal handlers without affecting rfd_.
++ dup_rfd_ = dup(rfd_);
++
++ if (dup_rfd_ != -1) {
++ struct sigaction act, old_act;
++ int ret = 0;
++
++ // Temporarily replace SIGCHLD handler with our own
++ memset(&act, 0, sizeof(act));
++ act.sa_handler = CloseDupRfd;
++ if (sigaction(SIGCHLD, &act, &old_act) == 0) {
++ struct itimerval timeout;
++
++ // install a 100ms timeout that generates SIGALARM on expiration
++ memset(&timeout, 0, sizeof(timeout));
++ timeout.it_value.tv_usec = 100 * 1000; // [ms] -> [usec]
++ if (setitimer(ITIMER_REAL, &timeout, NULL) == 0) {
++ char buf;
++
++ // Now try to read() from dup_rfd_. Return values from read():
++ //
++ // 1. token read -> 1
++ // 2. pipe closed -> 0
++ // 3. alarm expires -> -1 (EINTR)
++ // 4. child exits -> -1 (EINTR)
++ // 5. alarm expired before entering read() -> -1 (EBADF)
++ // 6. child exited before entering read() -> -1 (EBADF)
++ // 7. child exited before handler is installed -> go to 1 - 3
++ ret = read(dup_rfd_, &buf, 1);
++
++ // disarm timer
++ memset(&timeout, 0, sizeof(timeout));
++ setitimer(ITIMER_REAL, &timeout, NULL);
++ }
++
++ sigaction(SIGCHLD, &old_act, NULL);
++ }
++
++ CloseDupRfd(0);
++
++ // Case 1 from above list
++ if (ret > 0)
++ return true;
++ }
++ }
++
++ // read() would block, i.e. no token available,
++ // cases 2-6 from above list or
++ // select() / poll() / dup() / sigaction() / setitimer() failed
++ return false;
++}
++
++bool GNUmakeTokenPoolPosix::ReturnToken() {
++ const char buf = '+';
++ while (1) {
++ int ret = write(wfd_, &buf, 1);
++ if (ret > 0)
++ return true;
++ if ((ret != -1) || (errno != EINTR))
++ return false;
++ // write got interrupted - retry
++ }
++}
++
++int GNUmakeTokenPoolPosix::GetMonitorFd() {
++ return(rfd_);
++}
++
++struct TokenPool *TokenPool::Get() {
++ return new GNUmakeTokenPoolPosix;
++}
+diff --git a/src/tokenpool-gnu-make-win32.cc b/src/tokenpool-gnu-make-win32.cc
+new file mode 100644
+index 0000000000..2719f2c1fc
+--- /dev/null
++++ b/src/tokenpool-gnu-make-win32.cc
+@@ -0,0 +1,237 @@
++// Copyright 2018 Google Inc. All Rights Reserved.
++//
++// Licensed under the Apache License, Version 2.0 (the "License");
++// you may not use this file except in compliance with the License.
++// You may obtain a copy of the License at
++//
++// http://www.apache.org/licenses/LICENSE-2.0
++//
++// Unless required by applicable law or agreed to in writing, software
++// distributed under the License is distributed on an "AS IS" BASIS,
++// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++// See the License for the specific language governing permissions and
++// limitations under the License.
++
++#include "tokenpool-gnu-make.h"
++
++// always include first to make sure other headers do the correct thing...
++#include <windows.h>
++
++#include <ctype.h>
++#include <stdlib.h>
++#include <string.h>
++
++#include "util.h"
++
++// TokenPool implementation for GNU make jobserver - Win32 implementation
++// (https://www.gnu.org/software/make/manual/html_node/Windows-Jobserver.html)
++struct GNUmakeTokenPoolWin32 : public GNUmakeTokenPool {
++ GNUmakeTokenPoolWin32();
++ virtual ~GNUmakeTokenPoolWin32();
++
++ virtual void WaitForTokenAvailability(HANDLE ioport);
++ virtual bool TokenIsAvailable(ULONG_PTR key);
++
++ virtual const char *GetEnv(const char *name);
++ virtual bool ParseAuth(const char *jobserver);
++ virtual bool AcquireToken();
++ virtual bool ReturnToken();
++
++ private:
++ // Semaphore for GNU make jobserver protocol
++ HANDLE semaphore_jobserver_;
++ // Semaphore Child -> Parent
++ // - child releases it before entering wait on jobserver semaphore
++ // - parent blocks on it to know when child enters wait
++ HANDLE semaphore_enter_wait_;
++ // Semaphore Parent -> Child
++ // - parent releases it to allow child to restart loop
++ // - child blocks on it to know when to restart loop
++ HANDLE semaphore_restart_;
++ // set to false if child should exit loop and terminate thread
++ bool running_;
++ // child thread
++ HANDLE child_;
++ // I/O completion port from SubprocessSet
++ HANDLE ioport_;
++
++
++ DWORD SemaphoreThread();
++ void ReleaseSemaphore(HANDLE semaphore);
++ void WaitForObject(HANDLE object);
++ static DWORD WINAPI SemaphoreThreadWrapper(LPVOID param);
++ static void NoopAPCFunc(ULONG_PTR param);
++};
++
++GNUmakeTokenPoolWin32::GNUmakeTokenPoolWin32() : semaphore_jobserver_(NULL),
++ semaphore_enter_wait_(NULL),
++ semaphore_restart_(NULL),
++ running_(false),
++ child_(NULL),
++ ioport_(NULL) {
++}
++
++GNUmakeTokenPoolWin32::~GNUmakeTokenPoolWin32() {
++ Clear();
++ CloseHandle(semaphore_jobserver_);
++ semaphore_jobserver_ = NULL;
++
++ if (child_) {
++ // tell child thread to exit
++ running_ = false;
++ ReleaseSemaphore(semaphore_restart_);
++
++ // wait for child thread to exit
++ WaitForObject(child_);
++ CloseHandle(child_);
++ child_ = NULL;
++ }
++
++ if (semaphore_restart_) {
++ CloseHandle(semaphore_restart_);
++ semaphore_restart_ = NULL;
++ }
++
++ if (semaphore_enter_wait_) {
++ CloseHandle(semaphore_enter_wait_);
++ semaphore_enter_wait_ = NULL;
++ }
++}
++
++const char *GNUmakeTokenPoolWin32::GetEnv(const char *name) {
++ // getenv() does not work correctly together with tokenpool_tests.cc
++ static char buffer[MAX_PATH + 1];
++ if (GetEnvironmentVariable("MAKEFLAGS", buffer, sizeof(buffer)) == 0)
++ return NULL;
++ return(buffer);
++}
++
++bool GNUmakeTokenPoolWin32::ParseAuth(const char *jobserver) {
++ // match "--jobserver-auth=gmake_semaphore_<INTEGER>..."
++ const char *start = strchr(jobserver, '=');
++ if (start) {
++ const char *end = start;
++ unsigned int len;
++ char c, *auth;
++
++ while ((c = *++end) != '\0')
++ if (!(isalnum(c) || (c == '_')))
++ break;
++ len = end - start; // includes string terminator in count
++
++ if ((len > 1) && ((auth = (char *)malloc(len)) != NULL)) {
++ strncpy(auth, start + 1, len - 1);
++ auth[len - 1] = '\0';
++
++ if ((semaphore_jobserver_ = OpenSemaphore(SEMAPHORE_ALL_ACCESS, /* Semaphore access setting */
++ FALSE, /* Child processes DON'T inherit */
++ auth /* Semaphore name */
++ )) != NULL) {
++ free(auth);
++ return true;
++ }
++
++ free(auth);
++ }
++ }
++
++ return false;
++}
++
++bool GNUmakeTokenPoolWin32::AcquireToken() {
++ return WaitForSingleObject(semaphore_jobserver_, 0) == WAIT_OBJECT_0;
++}
++
++bool GNUmakeTokenPoolWin32::ReturnToken() {
++ ReleaseSemaphore(semaphore_jobserver_);
++ return true;
++}
++
++DWORD GNUmakeTokenPoolWin32::SemaphoreThread() {
++ while (running_) {
++ // indicate to parent that we are entering wait
++ ReleaseSemaphore(semaphore_enter_wait_);
++
++ // alertable wait forever on token semaphore
++ if (WaitForSingleObjectEx(semaphore_jobserver_, INFINITE, TRUE) == WAIT_OBJECT_0) {
++ // release token again for AcquireToken()
++ ReleaseSemaphore(semaphore_jobserver_);
++
++ // indicate to parent on ioport that a token might be available
++ if (!PostQueuedCompletionStatus(ioport_, 0, (ULONG_PTR) this, NULL))
++ Win32Fatal("PostQueuedCompletionStatus");
++ }
++
++ // wait for parent to allow loop restart
++ WaitForObject(semaphore_restart_);
++ // semaphore is now in nonsignaled state again for next run...
++ }
++
++ return 0;
++}
++
++DWORD WINAPI GNUmakeTokenPoolWin32::SemaphoreThreadWrapper(LPVOID param) {
++ GNUmakeTokenPoolWin32 *This = (GNUmakeTokenPoolWin32 *) param;
++ return This->SemaphoreThread();
++}
++
++void GNUmakeTokenPoolWin32::NoopAPCFunc(ULONG_PTR param) {
++}
++
++void GNUmakeTokenPoolWin32::WaitForTokenAvailability(HANDLE ioport) {
++ if (child_ == NULL) {
++ // first invocation
++ //
++ // subprocess-win32.cc uses I/O completion port (IOCP) which can't be
++ // used as a waitable object. Therefore we can't use WaitMultipleObjects()
++ // to wait on the IOCP and the token semaphore at the same time. Create
++ // a child thread that waits on the semaphore and posts an I/O completion
++ ioport_ = ioport;
++
++ // create both semaphores in nonsignaled state
++ if ((semaphore_enter_wait_ = CreateSemaphore(NULL, 0, 1, NULL))
++ == NULL)
++ Win32Fatal("CreateSemaphore/enter_wait");
++ if ((semaphore_restart_ = CreateSemaphore(NULL, 0, 1, NULL))
++ == NULL)
++ Win32Fatal("CreateSemaphore/restart");
++
++ // start child thread
++ running_ = true;
++ if ((child_ = CreateThread(NULL, 0, &SemaphoreThreadWrapper, this, 0, NULL))
++ == NULL)
++ Win32Fatal("CreateThread");
++
++ } else {
++ // all further invocations - allow child thread to loop
++ ReleaseSemaphore(semaphore_restart_);
++ }
++
++ // wait for child thread to enter wait
++ WaitForObject(semaphore_enter_wait_);
++ // semaphore is now in nonsignaled state again for next run...
++
++ // now SubprocessSet::DoWork() can enter GetQueuedCompletionStatus()...
++}
++
++bool GNUmakeTokenPoolWin32::TokenIsAvailable(ULONG_PTR key) {
++ // alert child thread to break wait on token semaphore
++ QueueUserAPC(&NoopAPCFunc, child_, (ULONG_PTR)NULL);
++
++ // return true when GetQueuedCompletionStatus() returned our key
++ return key == (ULONG_PTR) this;
++}
++
++void GNUmakeTokenPoolWin32::ReleaseSemaphore(HANDLE semaphore) {
++ if (!::ReleaseSemaphore(semaphore, 1, NULL))
++ Win32Fatal("ReleaseSemaphore");
++}
++
++void GNUmakeTokenPoolWin32::WaitForObject(HANDLE object) {
++ if (WaitForSingleObject(object, INFINITE) != WAIT_OBJECT_0)
++ Win32Fatal("WaitForSingleObject");
++}
++
++struct TokenPool *TokenPool::Get() {
++ return new GNUmakeTokenPoolWin32;
++}
+diff --git a/src/tokenpool-gnu-make.cc b/src/tokenpool-gnu-make.cc
+index 4132bb06d9..92ff611721 100644
+--- a/src/tokenpool-gnu-make.cc
++++ b/src/tokenpool-gnu-make.cc
+@@ -12,101 +12,26 @@
+ // See the License for the specific language governing permissions and
+ // limitations under the License.
+
+-#include "tokenpool.h"
++#include "tokenpool-gnu-make.h"
+
+-#include <errno.h>
+-#include <fcntl.h>
+-#include <poll.h>
+-#include <unistd.h>
+-#include <signal.h>
+-#include <sys/time.h>
++#include <stdlib.h>
+ #include <stdio.h>
+ #include <string.h>
+-#include <stdlib.h>
+
+ #include "line_printer.h"
+
+-// TokenPool implementation for GNU make jobserver
+-// (http://make.mad-scientist.net/papers/jobserver-implementation/)
+-struct GNUmakeTokenPool : public TokenPool {
+- GNUmakeTokenPool();
+- virtual ~GNUmakeTokenPool();
+-
+- virtual bool Acquire();
+- virtual void Reserve();
+- virtual void Release();
+- virtual void Clear();
+- virtual int GetMonitorFd();
+-
+- bool Setup(bool ignore, bool verbose, double& max_load_average);
+-
+- private:
+- int available_;
+- int used_;
+-
+-#ifdef _WIN32
+- // @TODO
+-#else
+- int rfd_;
+- int wfd_;
+-
+- struct sigaction old_act_;
+- bool restore_;
+-
+- static int dup_rfd_;
+- static void CloseDupRfd(int signum);
+-
+- bool CheckFd(int fd);
+- bool SetAlarmHandler();
+-#endif
+-
+- void Return();
+-};
+-
++// TokenPool implementation for GNU make jobserver - common bits
+ // every instance owns an implicit token -> available_ == 1
+-GNUmakeTokenPool::GNUmakeTokenPool() : available_(1), used_(0),
+- rfd_(-1), wfd_(-1), restore_(false) {
++GNUmakeTokenPool::GNUmakeTokenPool() : available_(1), used_(0) {
+ }
+
+ GNUmakeTokenPool::~GNUmakeTokenPool() {
+- Clear();
+- if (restore_)
+- sigaction(SIGALRM, &old_act_, NULL);
+-}
+-
+-bool GNUmakeTokenPool::CheckFd(int fd) {
+- if (fd < 0)
+- return false;
+- int ret = fcntl(fd, F_GETFD);
+- if (ret < 0)
+- return false;
+- return true;
+-}
+-
+-int GNUmakeTokenPool::dup_rfd_ = -1;
+-
+-void GNUmakeTokenPool::CloseDupRfd(int signum) {
+- close(dup_rfd_);
+- dup_rfd_ = -1;
+-}
+-
+-bool GNUmakeTokenPool::SetAlarmHandler() {
+- struct sigaction act;
+- memset(&act, 0, sizeof(act));
+- act.sa_handler = CloseDupRfd;
+- if (sigaction(SIGALRM, &act, &old_act_) < 0) {
+- perror("sigaction:");
+- return(false);
+- } else {
+- restore_ = true;
+- return(true);
+- }
+ }
+
+ bool GNUmakeTokenPool::Setup(bool ignore,
+ bool verbose,
+ double& max_load_average) {
+- const char *value = getenv("MAKEFLAGS");
++ const char *value = GetEnv("MAKEFLAGS");
+ if (value) {
+ // GNU make <= 4.1
+ const char *jobserver = strstr(value, "--jobserver-fds=");
+@@ -119,20 +44,13 @@ bool GNUmakeTokenPool::Setup(bool ignore,
+ if (ignore) {
+ printer.PrintOnNewLine("ninja: warning: -jN forced on command line; ignoring GNU make jobserver.\n");
+ } else {
+- int rfd = -1;
+- int wfd = -1;
+- if ((sscanf(jobserver, "%*[^=]=%d,%d", &rfd, &wfd) == 2) &&
+- CheckFd(rfd) &&
+- CheckFd(wfd) &&
+- SetAlarmHandler()) {
++ if (ParseAuth(jobserver)) {
+ const char *l_arg = strstr(value, " -l");
+ int load_limit = -1;
+
+ if (verbose) {
+ printer.PrintOnNewLine("ninja: using GNU make jobserver.\n");
+ }
+- rfd_ = rfd;
+- wfd_ = wfd;
+
+ // translate GNU make -lN to ninja -lN
+ if (l_arg &&
+@@ -154,83 +72,14 @@ bool GNUmakeTokenPool::Acquire() {
+ if (available_ > 0)
+ return true;
+
+- // Please read
+- //
+- // http://make.mad-scientist.net/papers/jobserver-implementation/
+- //
+- // for the reasoning behind the following code.
+- //
+- // Try to read one character from the pipe. Returns true on success.
+- //
+- // First check if read() would succeed without blocking.
+-#ifdef USE_PPOLL
+- pollfd pollfds[] = {{rfd_, POLLIN, 0}};
+- int ret = poll(pollfds, 1, 0);
+-#else
+- fd_set set;
+- struct timeval timeout = { 0, 0 };
+- FD_ZERO(&set);
+- FD_SET(rfd_, &set);
+- int ret = select(rfd_ + 1, &set, NULL, NULL, &timeout);
+-#endif
+- if (ret > 0) {
+- // Handle potential race condition:
+- // - the above check succeeded, i.e. read() should not block
+- // - the character disappears before we call read()
+- //
+- // Create a duplicate of rfd_. The duplicate file descriptor dup_rfd_
+- // can safely be closed by signal handlers without affecting rfd_.
+- dup_rfd_ = dup(rfd_);
+-
+- if (dup_rfd_ != -1) {
+- struct sigaction act, old_act;
+- int ret = 0;
+-
+- // Temporarily replace SIGCHLD handler with our own
+- memset(&act, 0, sizeof(act));
+- act.sa_handler = CloseDupRfd;
+- if (sigaction(SIGCHLD, &act, &old_act) == 0) {
+- struct itimerval timeout;
+-
+- // install a 100ms timeout that generates SIGALARM on expiration
+- memset(&timeout, 0, sizeof(timeout));
+- timeout.it_value.tv_usec = 100 * 1000; // [ms] -> [usec]
+- if (setitimer(ITIMER_REAL, &timeout, NULL) == 0) {
+- char buf;
+-
+- // Now try to read() from dup_rfd_. Return values from read():
+- //
+- // 1. token read -> 1
+- // 2. pipe closed -> 0
+- // 3. alarm expires -> -1 (EINTR)
+- // 4. child exits -> -1 (EINTR)
+- // 5. alarm expired before entering read() -> -1 (EBADF)
+- // 6. child exited before entering read() -> -1 (EBADF)
+- // 7. child exited before handler is installed -> go to 1 - 3
+- ret = read(dup_rfd_, &buf, 1);
+-
+- // disarm timer
+- memset(&timeout, 0, sizeof(timeout));
+- setitimer(ITIMER_REAL, &timeout, NULL);
+- }
+-
+- sigaction(SIGCHLD, &old_act, NULL);
+- }
+-
+- CloseDupRfd(0);
+-
+- // Case 1 from above list
+- if (ret > 0) {
+- available_++;
+- return true;
+- }
+- }
++ if (AcquireToken()) {
++ // token acquired
++ available_++;
++ return true;
++ } else {
++ // no token available
++ return false;
+ }
+-
+- // read() would block, i.e. no token available,
+- // cases 2-6 from above list or
+- // select() / poll() / dup() / sigaction() / setitimer() failed
+- return false;
+ }
+
+ void GNUmakeTokenPool::Reserve() {
+@@ -239,15 +88,8 @@ void GNUmakeTokenPool::Reserve() {
+ }
+
+ void GNUmakeTokenPool::Return() {
+- const char buf = '+';
+- while (1) {
+- int ret = write(wfd_, &buf, 1);
+- if (ret > 0)
+- available_--;
+- if ((ret != -1) || (errno != EINTR))
+- return;
+- // write got interrupted - retry
+- }
++ if (ReturnToken())
++ available_--;
+ }
+
+ void GNUmakeTokenPool::Release() {
+@@ -263,18 +105,3 @@ void GNUmakeTokenPool::Clear() {
+ while (available_ > 1)
+ Return();
+ }
+-
+-int GNUmakeTokenPool::GetMonitorFd() {
+- return(rfd_);
+-}
+-
+-struct TokenPool *TokenPool::Get(bool ignore,
+- bool verbose,
+- double& max_load_average) {
+- GNUmakeTokenPool *tokenpool = new GNUmakeTokenPool;
+- if (tokenpool->Setup(ignore, verbose, max_load_average))
+- return tokenpool;
+- else
+- delete tokenpool;
+- return NULL;
+-}
+diff --git a/src/tokenpool-gnu-make.h b/src/tokenpool-gnu-make.h
+new file mode 100644
+index 0000000000..d3852088e2
+--- /dev/null
++++ b/src/tokenpool-gnu-make.h
+@@ -0,0 +1,40 @@
++// Copyright 2016-2018 Google Inc. All Rights Reserved.
++//
++// Licensed under the Apache License, Version 2.0 (the "License");
++// you may not use this file except in compliance with the License.
++// You may obtain a copy of the License at
++//
++// http://www.apache.org/licenses/LICENSE-2.0
++//
++// Unless required by applicable law or agreed to in writing, software
++// distributed under the License is distributed on an "AS IS" BASIS,
++// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++// See the License for the specific language governing permissions and
++// limitations under the License.
++
++#include "tokenpool.h"
++
++// interface to GNU make token pool
++struct GNUmakeTokenPool : public TokenPool {
++ GNUmakeTokenPool();
++ virtual ~GNUmakeTokenPool();
++
++ // token pool implementation
++ virtual bool Acquire();
++ virtual void Reserve();
++ virtual void Release();
++ virtual void Clear();
++ virtual bool Setup(bool ignore, bool verbose, double& max_load_average);
++
++ // platform specific implementation
++ virtual const char *GetEnv(const char *name) = 0;
++ virtual bool ParseAuth(const char *jobserver) = 0;
++ virtual bool AcquireToken() = 0;
++ virtual bool ReturnToken() = 0;
++
++ private:
++ int available_;
++ int used_;
++
++ void Return();
++};
+diff --git a/src/tokenpool-none.cc b/src/tokenpool-none.cc
+index 4c592875b4..613d16882d 100644
+--- a/src/tokenpool-none.cc
++++ b/src/tokenpool-none.cc
+@@ -17,8 +17,6 @@
+ #include <stdlib.h>
+
+ // No-op TokenPool implementation
+-struct TokenPool *TokenPool::Get(bool ignore,
+- bool verbose,
+- double& max_load_average) {
++struct TokenPool *TokenPool::Get() {
+ return NULL;
+ }
+diff --git a/src/tokenpool.h b/src/tokenpool.h
+index 4bf477f20c..1be8e1d5ce 100644
+--- a/src/tokenpool.h
++++ b/src/tokenpool.h
+@@ -1,4 +1,4 @@
+-// Copyright 2016-2017 Google Inc. All Rights Reserved.
++// Copyright 2016-2018 Google Inc. All Rights Reserved.
+ //
+ // Licensed under the Apache License, Version 2.0 (the "License");
+ // you may not use this file except in compliance with the License.
+@@ -12,6 +12,10 @@
+ // See the License for the specific language governing permissions and
+ // limitations under the License.
+
++#ifdef _WIN32
++#include <windows.h>
++#endif
++
+ // interface to token pool
+ struct TokenPool {
+ virtual ~TokenPool() {}
+@@ -21,14 +25,18 @@ struct TokenPool {
+ virtual void Release() = 0;
+ virtual void Clear() = 0;
+
++ // returns false if token pool setup failed
++ virtual bool Setup(bool ignore, bool verbose, double& max_load_average) = 0;
++
+ #ifdef _WIN32
+- // @TODO
++ virtual void WaitForTokenAvailability(HANDLE ioport) = 0;
++ // returns true if a token has become available
++ // key is result from GetQueuedCompletionStatus()
++ virtual bool TokenIsAvailable(ULONG_PTR key) = 0;
+ #else
+ virtual int GetMonitorFd() = 0;
+ #endif
+
+ // returns NULL if token pool is not available
+- static struct TokenPool *Get(bool ignore,
+- bool verbose,
+- double& max_load_average);
++ static struct TokenPool *Get();
+ };
+diff --git a/src/tokenpool_test.cc b/src/tokenpool_test.cc
+index 6c89064ca4..8d4fd7d33a 100644
+--- a/src/tokenpool_test.cc
++++ b/src/tokenpool_test.cc
+@@ -16,13 +16,25 @@
+
+ #include "test.h"
+
+-#ifndef _WIN32
++#ifdef _WIN32
++#include <windows.h>
++#else
++#include <unistd.h>
++#endif
++
+ #include <stdio.h>
+ #include <stdlib.h>
+-#include <unistd.h>
+
++#ifdef _WIN32
++// should contain all valid characters
++#define SEMAPHORE_NAME "abcdefghijklmnopqrstwxyz01234567890_"
++#define AUTH_FORMAT(tmpl) "foo " tmpl "=%s bar"
++#define ENVIRONMENT_CLEAR() SetEnvironmentVariable("MAKEFLAGS", NULL)
++#define ENVIRONMENT_INIT(v) SetEnvironmentVariable("MAKEFLAGS", v)
++#else
++#define AUTH_FORMAT(tmpl) "foo " tmpl "=%d,%d bar"
+ #define ENVIRONMENT_CLEAR() unsetenv("MAKEFLAGS")
+-#define ENVIRONMENT_INIT(v) setenv("MAKEFLAGS", v, true);
++#define ENVIRONMENT_INIT(v) setenv("MAKEFLAGS", v, true)
+ #endif
+
+ namespace {
+@@ -32,43 +44,60 @@ const double kLoadAverageDefault = -1.23456789;
+ struct TokenPoolTest : public testing::Test {
+ double load_avg_;
+ TokenPool *tokens_;
+-#ifndef _WIN32
+ char buf_[1024];
++#ifdef _WIN32
++ const char *semaphore_name_;
++ HANDLE semaphore_;
++#else
+ int fds_[2];
+ #endif
+
+ virtual void SetUp() {
+ load_avg_ = kLoadAverageDefault;
+ tokens_ = NULL;
+-#ifndef _WIN32
+ ENVIRONMENT_CLEAR();
++#ifdef _WIN32
++ semaphore_name_ = SEMAPHORE_NAME;
++ if ((semaphore_ = CreateSemaphore(0, 0, 2, SEMAPHORE_NAME)) == NULL)
++#else
+ if (pipe(fds_) < 0)
+- ASSERT_TRUE(false);
+ #endif
++ ASSERT_TRUE(false);
+ }
+
+- void CreatePool(const char *format, bool ignore_jobserver) {
+-#ifndef _WIN32
++ void CreatePool(const char *format, bool ignore_jobserver = false) {
+ if (format) {
+- sprintf(buf_, format, fds_[0], fds_[1]);
++ sprintf(buf_, format,
++#ifdef _WIN32
++ semaphore_name_
++#else
++ fds_[0], fds_[1]
++#endif
++ );
+ ENVIRONMENT_INIT(buf_);
+ }
+-#endif
+- tokens_ = TokenPool::Get(ignore_jobserver, false, load_avg_);
++ if ((tokens_ = TokenPool::Get()) != NULL) {
++ if (!tokens_->Setup(ignore_jobserver, false, load_avg_)) {
++ delete tokens_;
++ tokens_ = NULL;
++ }
++ }
+ }
+
+ void CreateDefaultPool() {
+- CreatePool("foo --jobserver-auth=%d,%d bar", false);
++ CreatePool(AUTH_FORMAT("--jobserver-auth"));
+ }
+
+ virtual void TearDown() {
+ if (tokens_)
+ delete tokens_;
+-#ifndef _WIN32
++#ifdef _WIN32
++ CloseHandle(semaphore_);
++#else
+ close(fds_[0]);
+ close(fds_[1]);
+- ENVIRONMENT_CLEAR();
+ #endif
++ ENVIRONMENT_CLEAR();
+ }
+ };
+
+@@ -82,10 +111,9 @@ TEST_F(TokenPoolTest, NoTokenPool) {
+ EXPECT_EQ(kLoadAverageDefault, load_avg_);
+ }
+
+-#ifndef _WIN32
+ TEST_F(TokenPoolTest, SuccessfulOldSetup) {
+ // GNUmake <= 4.1
+- CreatePool("foo --jobserver-fds=%d,%d bar", false);
++ CreatePool(AUTH_FORMAT("--jobserver-fds"));
+
+ EXPECT_NE(NULL, tokens_);
+ EXPECT_EQ(kLoadAverageDefault, load_avg_);
+@@ -100,19 +128,37 @@ TEST_F(TokenPoolTest, SuccessfulNewSetup) {
+ }
+
+ TEST_F(TokenPoolTest, IgnoreWithJN) {
+- CreatePool("foo --jobserver-auth=%d,%d bar", true);
++ CreatePool(AUTH_FORMAT("--jobserver-auth"), true);
+
+ EXPECT_EQ(NULL, tokens_);
+ EXPECT_EQ(kLoadAverageDefault, load_avg_);
+ }
+
+ TEST_F(TokenPoolTest, HonorLN) {
+- CreatePool("foo -l9 --jobserver-auth=%d,%d bar", false);
++ CreatePool(AUTH_FORMAT("-l9 --jobserver-auth"));
+
+ EXPECT_NE(NULL, tokens_);
+ EXPECT_EQ(9.0, load_avg_);
+ }
+
++#ifdef _WIN32
++TEST_F(TokenPoolTest, SemaphoreNotFound) {
++ semaphore_name_ = SEMAPHORE_NAME "_foobar";
++ CreateDefaultPool();
++
++ EXPECT_EQ(NULL, tokens_);
++ EXPECT_EQ(kLoadAverageDefault, load_avg_);
++}
++
++TEST_F(TokenPoolTest, TokenIsAvailable) {
++ CreateDefaultPool();
++
++ ASSERT_NE(NULL, tokens_);
++ EXPECT_EQ(kLoadAverageDefault, load_avg_);
++
++ EXPECT_TRUE(tokens_->TokenIsAvailable((ULONG_PTR)tokens_));
++}
++#else
+ TEST_F(TokenPoolTest, MonitorFD) {
+ CreateDefaultPool();
+
+@@ -121,6 +167,7 @@ TEST_F(TokenPoolTest, MonitorFD) {
+
+ EXPECT_EQ(fds_[0], tokens_->GetMonitorFd());
+ }
++#endif
+
+ TEST_F(TokenPoolTest, ImplicitToken) {
+ CreateDefaultPool();
+@@ -147,7 +194,13 @@ TEST_F(TokenPoolTest, TwoTokens) {
+ EXPECT_FALSE(tokens_->Acquire());
+
+ // jobserver offers 2nd token
++#ifdef _WIN32
++ LONG previous;
++ ASSERT_TRUE(ReleaseSemaphore(semaphore_, 1, &previous));
++ ASSERT_EQ(0, previous);
++#else
+ ASSERT_EQ(1u, write(fds_[1], "T", 1));
++#endif
+ EXPECT_TRUE(tokens_->Acquire());
+ tokens_->Reserve();
+ EXPECT_FALSE(tokens_->Acquire());
+@@ -160,8 +213,14 @@ TEST_F(TokenPoolTest, TwoTokens) {
+ tokens_->Release();
+ EXPECT_TRUE(tokens_->Acquire());
+
+- // there must be one token in the pipe
++ // there must be one token available
++#ifdef _WIN32
++ EXPECT_EQ(WAIT_OBJECT_0, WaitForSingleObject(semaphore_, 0));
++ EXPECT_TRUE(ReleaseSemaphore(semaphore_, 1, &previous));
++ EXPECT_EQ(0, previous);
++#else
+ EXPECT_EQ(1u, read(fds_[0], buf_, sizeof(buf_)));
++#endif
+
+ // implicit token
+ EXPECT_TRUE(tokens_->Acquire());
+@@ -179,7 +238,13 @@ TEST_F(TokenPoolTest, Clear) {
+ EXPECT_FALSE(tokens_->Acquire());
+
+ // jobserver offers 2nd & 3rd token
++#ifdef _WIN32
++ LONG previous;
++ ASSERT_TRUE(ReleaseSemaphore(semaphore_, 2, &previous));
++ ASSERT_EQ(0, previous);
++#else
+ ASSERT_EQ(2u, write(fds_[1], "TT", 2));
++#endif
+ EXPECT_TRUE(tokens_->Acquire());
+ tokens_->Reserve();
+ EXPECT_TRUE(tokens_->Acquire());
+@@ -189,10 +254,16 @@ TEST_F(TokenPoolTest, Clear) {
+ tokens_->Clear();
+ EXPECT_TRUE(tokens_->Acquire());
+
+- // there must be two tokens in the pipe
++ // there must be two tokens available
++#ifdef _WIN32
++ EXPECT_EQ(WAIT_OBJECT_0, WaitForSingleObject(semaphore_, 0));
++ EXPECT_EQ(WAIT_OBJECT_0, WaitForSingleObject(semaphore_, 0));
++ EXPECT_TRUE(ReleaseSemaphore(semaphore_, 2, &previous));
++ EXPECT_EQ(0, previous);
++#else
+ EXPECT_EQ(2u, read(fds_[0], buf_, sizeof(buf_)));
++#endif
+
+ // implicit token
+ EXPECT_TRUE(tokens_->Acquire());
+ }
+-#endif
+
+From 2b9c81c0ec1226d8795e7725529f13be41eaa385 Mon Sep 17 00:00:00 2001
+From: Stefan Becker <chemobejk@gmail.com>
+Date: Fri, 14 Dec 2018 13:27:11 +0200
+Subject: [PATCH 11/11] Prepare PR for merging - part II
+
+- remove unnecessary "struct" from TokenPool
+- add PAPCFUNC cast to QueryUserAPC()
+- remove hard-coded MAKEFLAGS string from win32
+- remove useless build test CompleteNoWork
+- rename TokenPoolTest to TestTokenPool
+- add tokenpool modules to CMake build
+- remove unused no-op TokenPool implementation
+- fix errors flagged by codespell & clang-tidy
+- address review comments from
+
+https://github.com/ninja-build/ninja/pull/1140#pullrequestreview-195195803
+https://github.com/ninja-build/ninja/pull/1140#pullrequestreview-185089255
+https://github.com/ninja-build/ninja/pull/1140#issuecomment-473898963
+https://github.com/ninja-build/ninja/pull/1140#issuecomment-596624610
+---
+ CMakeLists.txt | 8 ++++-
+ src/build.cc | 2 +-
+ src/build_test.cc | 12 +------
+ src/subprocess-posix.cc | 4 +--
+ src/subprocess-win32.cc | 2 +-
+ src/subprocess.h | 2 +-
+ src/subprocess_test.cc | 26 +++++++-------
+ src/tokenpool-gnu-make-posix.cc | 21 +++++------
+ src/tokenpool-gnu-make-win32.cc | 36 ++++++++++---------
+ src/tokenpool-gnu-make.cc | 63 +++++++++++++++++----------------
+ src/tokenpool-gnu-make.h | 6 ++--
+ src/tokenpool-none.cc | 22 ------------
+ src/tokenpool.h | 2 +-
+ src/tokenpool_test.cc | 8 ++---
+ 14 files changed, 94 insertions(+), 120 deletions(-)
+ delete mode 100644 src/tokenpool-none.cc
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 57ae548f5b..e2876fe413 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -112,6 +112,7 @@ add_library(libninja OBJECT
+ src/state.cc
+ src/status.cc
+ src/string_piece_util.cc
++ src/tokenpool-gnu-make.cc
+ src/util.cc
+ src/version.cc
+ )
+@@ -123,9 +124,13 @@ if(WIN32)
+ src/msvc_helper_main-win32.cc
+ src/getopt.c
+ src/minidump-win32.cc
++ src/tokenpool-gnu-make-win32.cc
+ )
+ else()
+- target_sources(libninja PRIVATE src/subprocess-posix.cc)
++ target_sources(libninja PRIVATE
++ src/subprocess-posix.cc
++ src/tokenpool-gnu-make-posix.cc
++ )
+ if(CMAKE_SYSTEM_NAME STREQUAL "OS400" OR CMAKE_SYSTEM_NAME STREQUAL "AIX")
+ target_sources(libninja PRIVATE src/getopt.c)
+ endif()
+@@ -204,6 +209,7 @@ if(BUILD_TESTING)
+ src/string_piece_util_test.cc
+ src/subprocess_test.cc
+ src/test.cc
++ src/tokenpool_test.cc
+ src/util_test.cc
+ )
+ if(WIN32)
+diff --git a/src/build.cc b/src/build.cc
+index 20c3bdc2a0..854df08c2a 100644
+--- a/src/build.cc
++++ b/src/build.cc
+@@ -467,7 +467,7 @@ struct RealCommandRunner : public CommandRunner {
+ // copy of config_.max_load_average; can be modified by TokenPool setup
+ double max_load_average_;
+ SubprocessSet subprocs_;
+- TokenPool *tokens_;
++ TokenPool* tokens_;
+ map<const Subprocess*, Edge*> subproc_to_edge_;
+ };
+
+diff --git a/src/build_test.cc b/src/build_test.cc
+index dd41dfbe1d..8901c9518f 100644
+--- a/src/build_test.cc
++++ b/src/build_test.cc
+@@ -4098,7 +4098,7 @@ struct BuildTokenTest : public BuildTest {
+ void ExpectWaitForCommand(int count, ...);
+
+ private:
+- void EnqueueBooleans(vector<bool>& booleans, int count, va_list ao);
++ void EnqueueBooleans(vector<bool>& booleans, int count, va_list ap);
+ };
+
+ void BuildTokenTest::SetUp() {
+@@ -4144,16 +4144,6 @@ void BuildTokenTest::EnqueueBooleans(vector<bool>& booleans, int count, va_list
+ }
+ }
+
+-TEST_F(BuildTokenTest, CompleteNoWork) {
+- // plan should not execute anything
+- string err;
+-
+- EXPECT_TRUE(builder_.Build(&err));
+- EXPECT_EQ("", err);
+-
+- EXPECT_EQ(0u, token_command_runner_.commands_ran_.size());
+-}
+-
+ TEST_F(BuildTokenTest, DoNotAquireToken) {
+ // plan should execute one command
+ string err;
+diff --git a/src/subprocess-posix.cc b/src/subprocess-posix.cc
+index 74451b0be2..31839276c4 100644
+--- a/src/subprocess-posix.cc
++++ b/src/subprocess-posix.cc
+@@ -250,7 +250,7 @@ Subprocess *SubprocessSet::Add(const string& command, bool use_console) {
+ }
+
+ #ifdef USE_PPOLL
+-bool SubprocessSet::DoWork(struct TokenPool* tokens) {
++bool SubprocessSet::DoWork(TokenPool* tokens) {
+ vector<pollfd> fds;
+ nfds_t nfds = 0;
+
+@@ -315,7 +315,7 @@ bool SubprocessSet::DoWork(struct TokenPool* tokens) {
+ }
+
+ #else // !defined(USE_PPOLL)
+-bool SubprocessSet::DoWork(struct TokenPool* tokens) {
++bool SubprocessSet::DoWork(TokenPool* tokens) {
+ fd_set set;
+ int nfds = 0;
+ FD_ZERO(&set);
+diff --git a/src/subprocess-win32.cc b/src/subprocess-win32.cc
+index ce3e2c20a4..2926e9a221 100644
+--- a/src/subprocess-win32.cc
++++ b/src/subprocess-win32.cc
+@@ -252,7 +252,7 @@ Subprocess *SubprocessSet::Add(const string& command, bool use_console) {
+ return subprocess;
+ }
+
+-bool SubprocessSet::DoWork(struct TokenPool* tokens) {
++bool SubprocessSet::DoWork(TokenPool* tokens) {
+ DWORD bytes_read;
+ Subprocess* subproc;
+ OVERLAPPED* overlapped;
+diff --git a/src/subprocess.h b/src/subprocess.h
+index 9ea67ea477..1ec78171e8 100644
+--- a/src/subprocess.h
++++ b/src/subprocess.h
+@@ -86,7 +86,7 @@ struct SubprocessSet {
+ ~SubprocessSet();
+
+ Subprocess* Add(const std::string& command, bool use_console = false);
+- bool DoWork(struct TokenPool* tokens);
++ bool DoWork(TokenPool* tokens);
+ Subprocess* NextFinished();
+ void Clear();
+
+diff --git a/src/subprocess_test.cc b/src/subprocess_test.cc
+index f625963462..7b146f31be 100644
+--- a/src/subprocess_test.cc
++++ b/src/subprocess_test.cc
+@@ -35,7 +35,7 @@ const char* kSimpleCommand = "cmd /c dir \\";
+ const char* kSimpleCommand = "ls /";
+ #endif
+
+-struct TokenPoolTest : public TokenPool {
++struct TestTokenPool : public TokenPool {
+ bool Acquire() { return false; }
+ void Reserve() {}
+ void Release() {}
+@@ -58,7 +58,7 @@ struct TokenPoolTest : public TokenPool {
+
+ struct SubprocessTest : public testing::Test {
+ SubprocessSet subprocs_;
+- TokenPoolTest tokens_;
++ TestTokenPool tokens_;
+ };
+
+ } // anonymous namespace
+@@ -73,7 +73,7 @@ TEST_F(SubprocessTest, BadCommandStderr) {
+ // Pretend we discovered that stderr was ready for writing.
+ subprocs_.DoWork(NULL);
+ }
+- ASSERT_EQ(false, subprocs_.IsTokenAvailable());
++ ASSERT_FALSE(subprocs_.IsTokenAvailable());
+
+ EXPECT_EQ(ExitFailure, subproc->Finish());
+ EXPECT_NE("", subproc->GetOutput());
+@@ -89,7 +89,7 @@ TEST_F(SubprocessTest, NoSuchCommand) {
+ // Pretend we discovered that stderr was ready for writing.
+ subprocs_.DoWork(NULL);
+ }
+- ASSERT_EQ(false, subprocs_.IsTokenAvailable());
++ ASSERT_FALSE(subprocs_.IsTokenAvailable());
+
+ EXPECT_EQ(ExitFailure, subproc->Finish());
+ EXPECT_NE("", subproc->GetOutput());
+@@ -109,7 +109,7 @@ TEST_F(SubprocessTest, InterruptChild) {
+ while (!subproc->Done()) {
+ subprocs_.DoWork(NULL);
+ }
+- ASSERT_EQ(false, subprocs_.IsTokenAvailable());
++ ASSERT_FALSE(subprocs_.IsTokenAvailable());
+
+ EXPECT_EQ(ExitInterrupted, subproc->Finish());
+ }
+@@ -135,7 +135,7 @@ TEST_F(SubprocessTest, InterruptChildWithSigTerm) {
+ while (!subproc->Done()) {
+ subprocs_.DoWork(NULL);
+ }
+- ASSERT_EQ(false, subprocs_.IsTokenAvailable());
++ ASSERT_FALSE(subprocs_.IsTokenAvailable());
+
+ EXPECT_EQ(ExitInterrupted, subproc->Finish());
+ }
+@@ -161,7 +161,7 @@ TEST_F(SubprocessTest, InterruptChildWithSigHup) {
+ while (!subproc->Done()) {
+ subprocs_.DoWork(NULL);
+ }
+- ASSERT_EQ(false, subprocs_.IsTokenAvailable());
++ ASSERT_FALSE(subprocs_.IsTokenAvailable());
+
+ EXPECT_EQ(ExitInterrupted, subproc->Finish());
+ }
+@@ -190,7 +190,7 @@ TEST_F(SubprocessTest, Console) {
+ while (!subproc->Done()) {
+ subprocs_.DoWork(NULL);
+ }
+- ASSERT_EQ(false, subprocs_.IsTokenAvailable());
++ ASSERT_FALSE(subprocs_.IsTokenAvailable());
+
+ EXPECT_EQ(ExitSuccess, subproc->Finish());
+ }
+@@ -206,7 +206,7 @@ TEST_F(SubprocessTest, SetWithSingle) {
+ while (!subproc->Done()) {
+ subprocs_.DoWork(NULL);
+ }
+- ASSERT_EQ(false, subprocs_.IsTokenAvailable());
++ ASSERT_FALSE(subprocs_.IsTokenAvailable());
+ ASSERT_EQ(ExitSuccess, subproc->Finish());
+ ASSERT_NE("", subproc->GetOutput());
+
+@@ -243,7 +243,7 @@ TEST_F(SubprocessTest, SetWithMulti) {
+ ASSERT_GT(subprocs_.running_.size(), 0u);
+ subprocs_.DoWork(NULL);
+ }
+- ASSERT_EQ(false, subprocs_.IsTokenAvailable());
++ ASSERT_FALSE(subprocs_.IsTokenAvailable());
+ ASSERT_EQ(0u, subprocs_.running_.size());
+ ASSERT_EQ(3u, subprocs_.finished_.size());
+
+@@ -278,7 +278,7 @@ TEST_F(SubprocessTest, SetWithLots) {
+ subprocs_.ResetTokenAvailable();
+ while (!subprocs_.running_.empty())
+ subprocs_.DoWork(NULL);
+- ASSERT_EQ(false, subprocs_.IsTokenAvailable());
++ ASSERT_FALSE(subprocs_.IsTokenAvailable());
+ for (size_t i = 0; i < procs.size(); ++i) {
+ ASSERT_EQ(ExitSuccess, procs[i]->Finish());
+ ASSERT_NE("", procs[i]->GetOutput());
+@@ -298,7 +298,7 @@ TEST_F(SubprocessTest, ReadStdin) {
+ while (!subproc->Done()) {
+ subprocs_.DoWork(NULL);
+ }
+- ASSERT_EQ(false, subprocs_.IsTokenAvailable());
++ ASSERT_FALSE(subprocs_.IsTokenAvailable());
+ ASSERT_EQ(ExitSuccess, subproc->Finish());
+ ASSERT_EQ(1u, subprocs_.finished_.size());
+ }
+@@ -322,7 +322,7 @@ TEST_F(SubprocessTest, TokenAvailable) {
+ subprocs_.DoWork(&tokens_);
+ #ifdef _WIN32
+ tokens_._token_available = false;
+- // we need to loop here as we have no conrol where the token
++ // we need to loop here as we have no control where the token
+ // I/O completion post ends up in the queue
+ while (!subproc->Done() && !subprocs_.IsTokenAvailable()) {
+ subprocs_.DoWork(&tokens_);
+diff --git a/src/tokenpool-gnu-make-posix.cc b/src/tokenpool-gnu-make-posix.cc
+index 70d84bfff7..353bda226a 100644
+--- a/src/tokenpool-gnu-make-posix.cc
++++ b/src/tokenpool-gnu-make-posix.cc
+@@ -32,8 +32,8 @@ struct GNUmakeTokenPoolPosix : public GNUmakeTokenPool {
+
+ virtual int GetMonitorFd();
+
+- virtual const char *GetEnv(const char *name) { return getenv(name); };
+- virtual bool ParseAuth(const char *jobserver);
++ virtual const char* GetEnv(const char* name) { return getenv(name); };
++ virtual bool ParseAuth(const char* jobserver);
+ virtual bool AcquireToken();
+ virtual bool ReturnToken();
+
+@@ -64,9 +64,7 @@ bool GNUmakeTokenPoolPosix::CheckFd(int fd) {
+ if (fd < 0)
+ return false;
+ int ret = fcntl(fd, F_GETFD);
+- if (ret < 0)
+- return false;
+- return true;
++ return ret >= 0;
+ }
+
+ int GNUmakeTokenPoolPosix::dup_rfd_ = -1;
+@@ -82,14 +80,13 @@ bool GNUmakeTokenPoolPosix::SetAlarmHandler() {
+ act.sa_handler = CloseDupRfd;
+ if (sigaction(SIGALRM, &act, &old_act_) < 0) {
+ perror("sigaction:");
+- return(false);
+- } else {
+- restore_ = true;
+- return(true);
++ return false;
+ }
++ restore_ = true;
++ return true;
+ }
+
+-bool GNUmakeTokenPoolPosix::ParseAuth(const char *jobserver) {
++bool GNUmakeTokenPoolPosix::ParseAuth(const char* jobserver) {
+ int rfd = -1;
+ int wfd = -1;
+ if ((sscanf(jobserver, "%*[^=]=%d,%d", &rfd, &wfd) == 2) &&
+@@ -195,9 +192,9 @@ bool GNUmakeTokenPoolPosix::ReturnToken() {
+ }
+
+ int GNUmakeTokenPoolPosix::GetMonitorFd() {
+- return(rfd_);
++ return rfd_;
+ }
+
+-struct TokenPool *TokenPool::Get() {
++TokenPool* TokenPool::Get() {
+ return new GNUmakeTokenPoolPosix;
+ }
+diff --git a/src/tokenpool-gnu-make-win32.cc b/src/tokenpool-gnu-make-win32.cc
+index 2719f2c1fc..b2bb52fadb 100644
+--- a/src/tokenpool-gnu-make-win32.cc
++++ b/src/tokenpool-gnu-make-win32.cc
+@@ -14,7 +14,8 @@
+
+ #include "tokenpool-gnu-make.h"
+
+-// always include first to make sure other headers do the correct thing...
++// Always include this first.
++// Otherwise the other system headers don't work correctly under Win32
+ #include <windows.h>
+
+ #include <ctype.h>
+@@ -32,8 +33,8 @@ struct GNUmakeTokenPoolWin32 : public GNUmakeTokenPool {
+ virtual void WaitForTokenAvailability(HANDLE ioport);
+ virtual bool TokenIsAvailable(ULONG_PTR key);
+
+- virtual const char *GetEnv(const char *name);
+- virtual bool ParseAuth(const char *jobserver);
++ virtual const char* GetEnv(const char* name);
++ virtual bool ParseAuth(const char* jobserver);
+ virtual bool AcquireToken();
+ virtual bool ReturnToken();
+
+@@ -98,19 +99,19 @@ GNUmakeTokenPoolWin32::~GNUmakeTokenPoolWin32() {
+ }
+ }
+
+-const char *GNUmakeTokenPoolWin32::GetEnv(const char *name) {
++const char* GNUmakeTokenPoolWin32::GetEnv(const char* name) {
+ // getenv() does not work correctly together with tokenpool_tests.cc
+ static char buffer[MAX_PATH + 1];
+- if (GetEnvironmentVariable("MAKEFLAGS", buffer, sizeof(buffer)) == 0)
++ if (GetEnvironmentVariable(name, buffer, sizeof(buffer)) == 0)
+ return NULL;
+- return(buffer);
++ return buffer;
+ }
+
+-bool GNUmakeTokenPoolWin32::ParseAuth(const char *jobserver) {
++bool GNUmakeTokenPoolWin32::ParseAuth(const char* jobserver) {
+ // match "--jobserver-auth=gmake_semaphore_<INTEGER>..."
+- const char *start = strchr(jobserver, '=');
++ const char* start = strchr(jobserver, '=');
+ if (start) {
+- const char *end = start;
++ const char* end = start;
+ unsigned int len;
+ char c, *auth;
+
+@@ -119,14 +120,15 @@ bool GNUmakeTokenPoolWin32::ParseAuth(const char *jobserver) {
+ break;
+ len = end - start; // includes string terminator in count
+
+- if ((len > 1) && ((auth = (char *)malloc(len)) != NULL)) {
++ if ((len > 1) && ((auth = (char*)malloc(len)) != NULL)) {
+ strncpy(auth, start + 1, len - 1);
+ auth[len - 1] = '\0';
+
+- if ((semaphore_jobserver_ = OpenSemaphore(SEMAPHORE_ALL_ACCESS, /* Semaphore access setting */
+- FALSE, /* Child processes DON'T inherit */
+- auth /* Semaphore name */
+- )) != NULL) {
++ if ((semaphore_jobserver_ =
++ OpenSemaphore(SEMAPHORE_ALL_ACCESS, /* Semaphore access setting */
++ FALSE, /* Child processes DON'T inherit */
++ auth /* Semaphore name */
++ )) != NULL) {
+ free(auth);
+ return true;
+ }
+@@ -171,7 +173,7 @@ DWORD GNUmakeTokenPoolWin32::SemaphoreThread() {
+ }
+
+ DWORD WINAPI GNUmakeTokenPoolWin32::SemaphoreThreadWrapper(LPVOID param) {
+- GNUmakeTokenPoolWin32 *This = (GNUmakeTokenPoolWin32 *) param;
++ GNUmakeTokenPoolWin32* This = (GNUmakeTokenPoolWin32*) param;
+ return This->SemaphoreThread();
+ }
+
+@@ -216,7 +218,7 @@ void GNUmakeTokenPoolWin32::WaitForTokenAvailability(HANDLE ioport) {
+
+ bool GNUmakeTokenPoolWin32::TokenIsAvailable(ULONG_PTR key) {
+ // alert child thread to break wait on token semaphore
+- QueueUserAPC(&NoopAPCFunc, child_, (ULONG_PTR)NULL);
++ QueueUserAPC((PAPCFUNC)&NoopAPCFunc, child_, (ULONG_PTR)NULL);
+
+ // return true when GetQueuedCompletionStatus() returned our key
+ return key == (ULONG_PTR) this;
+@@ -232,6 +234,6 @@ void GNUmakeTokenPoolWin32::WaitForObject(HANDLE object) {
+ Win32Fatal("WaitForSingleObject");
+ }
+
+-struct TokenPool *TokenPool::Get() {
++TokenPool* TokenPool::Get() {
+ return new GNUmakeTokenPoolWin32;
+ }
+diff --git a/src/tokenpool-gnu-make.cc b/src/tokenpool-gnu-make.cc
+index 92ff611721..60e0552924 100644
+--- a/src/tokenpool-gnu-make.cc
++++ b/src/tokenpool-gnu-make.cc
+@@ -31,36 +31,37 @@ GNUmakeTokenPool::~GNUmakeTokenPool() {
+ bool GNUmakeTokenPool::Setup(bool ignore,
+ bool verbose,
+ double& max_load_average) {
+- const char *value = GetEnv("MAKEFLAGS");
+- if (value) {
+- // GNU make <= 4.1
+- const char *jobserver = strstr(value, "--jobserver-fds=");
++ const char* value = GetEnv("MAKEFLAGS");
++ if (!value)
++ return false;
++
++ // GNU make <= 4.1
++ const char* jobserver = strstr(value, "--jobserver-fds=");
++ if (!jobserver)
+ // GNU make => 4.2
+- if (!jobserver)
+- jobserver = strstr(value, "--jobserver-auth=");
+- if (jobserver) {
+- LinePrinter printer;
+-
+- if (ignore) {
+- printer.PrintOnNewLine("ninja: warning: -jN forced on command line; ignoring GNU make jobserver.\n");
+- } else {
+- if (ParseAuth(jobserver)) {
+- const char *l_arg = strstr(value, " -l");
+- int load_limit = -1;
+-
+- if (verbose) {
+- printer.PrintOnNewLine("ninja: using GNU make jobserver.\n");
+- }
+-
+- // translate GNU make -lN to ninja -lN
+- if (l_arg &&
+- (sscanf(l_arg + 3, "%d ", &load_limit) == 1) &&
+- (load_limit > 0)) {
+- max_load_average = load_limit;
+- }
+-
+- return true;
++ jobserver = strstr(value, "--jobserver-auth=");
++ if (jobserver) {
++ LinePrinter printer;
++
++ if (ignore) {
++ printer.PrintOnNewLine("ninja: warning: -jN forced on command line; ignoring GNU make jobserver.\n");
++ } else {
++ if (ParseAuth(jobserver)) {
++ const char* l_arg = strstr(value, " -l");
++ int load_limit = -1;
++
++ if (verbose) {
++ printer.PrintOnNewLine("ninja: using GNU make jobserver.\n");
++ }
++
++ // translate GNU make -lN to ninja -lN
++ if (l_arg &&
++ (sscanf(l_arg + 3, "%d ", &load_limit) == 1) &&
++ (load_limit > 0)) {
++ max_load_average = load_limit;
+ }
++
++ return true;
+ }
+ }
+ }
+@@ -76,10 +77,10 @@ bool GNUmakeTokenPool::Acquire() {
+ // token acquired
+ available_++;
+ return true;
+- } else {
+- // no token available
+- return false;
+ }
++
++ // no token available
++ return false;
+ }
+
+ void GNUmakeTokenPool::Reserve() {
+diff --git a/src/tokenpool-gnu-make.h b/src/tokenpool-gnu-make.h
+index d3852088e2..c94cca5e2d 100644
+--- a/src/tokenpool-gnu-make.h
++++ b/src/tokenpool-gnu-make.h
+@@ -17,7 +17,7 @@
+ // interface to GNU make token pool
+ struct GNUmakeTokenPool : public TokenPool {
+ GNUmakeTokenPool();
+- virtual ~GNUmakeTokenPool();
++ ~GNUmakeTokenPool();
+
+ // token pool implementation
+ virtual bool Acquire();
+@@ -27,8 +27,8 @@ struct GNUmakeTokenPool : public TokenPool {
+ virtual bool Setup(bool ignore, bool verbose, double& max_load_average);
+
+ // platform specific implementation
+- virtual const char *GetEnv(const char *name) = 0;
+- virtual bool ParseAuth(const char *jobserver) = 0;
++ virtual const char* GetEnv(const char* name) = 0;
++ virtual bool ParseAuth(const char* jobserver) = 0;
+ virtual bool AcquireToken() = 0;
+ virtual bool ReturnToken() = 0;
+
+diff --git a/src/tokenpool-none.cc b/src/tokenpool-none.cc
+deleted file mode 100644
+index 613d16882d..0000000000
+--- a/src/tokenpool-none.cc
++++ /dev/null
+@@ -1,22 +0,0 @@
+-// Copyright 2016-2018 Google Inc. All Rights Reserved.
+-//
+-// Licensed under the Apache License, Version 2.0 (the "License");
+-// you may not use this file except in compliance with the License.
+-// You may obtain a copy of the License at
+-//
+-// http://www.apache.org/licenses/LICENSE-2.0
+-//
+-// Unless required by applicable law or agreed to in writing, software
+-// distributed under the License is distributed on an "AS IS" BASIS,
+-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-// See the License for the specific language governing permissions and
+-// limitations under the License.
+-
+-#include "tokenpool.h"
+-
+-#include <stdlib.h>
+-
+-// No-op TokenPool implementation
+-struct TokenPool *TokenPool::Get() {
+- return NULL;
+-}
+diff --git a/src/tokenpool.h b/src/tokenpool.h
+index 1be8e1d5ce..931c22754d 100644
+--- a/src/tokenpool.h
++++ b/src/tokenpool.h
+@@ -38,5 +38,5 @@ struct TokenPool {
+ #endif
+
+ // returns NULL if token pool is not available
+- static struct TokenPool *Get();
++ static TokenPool* Get();
+ };
+diff --git a/src/tokenpool_test.cc b/src/tokenpool_test.cc
+index 8d4fd7d33a..8d3061cb30 100644
+--- a/src/tokenpool_test.cc
++++ b/src/tokenpool_test.cc
+@@ -43,10 +43,10 @@ const double kLoadAverageDefault = -1.23456789;
+
+ struct TokenPoolTest : public testing::Test {
+ double load_avg_;
+- TokenPool *tokens_;
++ TokenPool* tokens_;
+ char buf_[1024];
+ #ifdef _WIN32
+- const char *semaphore_name_;
++ const char* semaphore_name_;
+ HANDLE semaphore_;
+ #else
+ int fds_[2];
+@@ -65,7 +65,7 @@ struct TokenPoolTest : public testing::Test {
+ ASSERT_TRUE(false);
+ }
+
+- void CreatePool(const char *format, bool ignore_jobserver = false) {
++ void CreatePool(const char* format, bool ignore_jobserver = false) {
+ if (format) {
+ sprintf(buf_, format,
+ #ifdef _WIN32
+@@ -209,7 +209,7 @@ TEST_F(TokenPoolTest, TwoTokens) {
+ tokens_->Release();
+ EXPECT_TRUE(tokens_->Acquire());
+
+- // release implict token - must return 2nd token back to jobserver
++ // release implicit token - must return 2nd token back to jobserver
+ tokens_->Release();
+ EXPECT_TRUE(tokens_->Acquire());
+
projects / openwrt / openwrt.git / commitdiff