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Unified Diff: base/threading/thread.cc

Issue 1647803004: Move base to DEPS (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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Index: base/threading/thread.cc
diff --git a/base/threading/thread.cc b/base/threading/thread.cc
deleted file mode 100644
index 9c4535b59eb4361ba503691f497dbd9bdd97cc5f..0000000000000000000000000000000000000000
--- a/base/threading/thread.cc
+++ /dev/null
@@ -1,270 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/threading/thread.h"
-
-#include "base/bind.h"
-#include "base/lazy_instance.h"
-#include "base/location.h"
-#include "base/synchronization/waitable_event.h"
-#include "base/third_party/dynamic_annotations/dynamic_annotations.h"
-#include "base/threading/thread_id_name_manager.h"
-#include "base/threading/thread_local.h"
-#include "base/threading/thread_restrictions.h"
-
-#if defined(OS_WIN)
-#include "base/win/scoped_com_initializer.h"
-#endif
-
-namespace base {
-
-namespace {
-
-// We use this thread-local variable to record whether or not a thread exited
-// because its Stop method was called. This allows us to catch cases where
-// MessageLoop::QuitWhenIdle() is called directly, which is unexpected when
-// using a Thread to setup and run a MessageLoop.
-base::LazyInstance<base::ThreadLocalBoolean> lazy_tls_bool =
- LAZY_INSTANCE_INITIALIZER;
-
-} // namespace
-
-// This is used to trigger the message loop to exit.
-void ThreadQuitHelper() {
- MessageLoop::current()->QuitWhenIdle();
- Thread::SetThreadWasQuitProperly(true);
-}
-
-Thread::Options::Options()
- : message_loop_type(MessageLoop::TYPE_DEFAULT),
- timer_slack(TIMER_SLACK_NONE),
- stack_size(0),
- priority(ThreadPriority::NORMAL) {
-}
-
-Thread::Options::Options(MessageLoop::Type type,
- size_t size)
- : message_loop_type(type),
- timer_slack(TIMER_SLACK_NONE),
- stack_size(size),
- priority(ThreadPriority::NORMAL) {
-}
-
-Thread::Options::~Options() {
-}
-
-Thread::Thread(const std::string& name)
- :
-#if defined(OS_WIN)
- com_status_(NONE),
-#endif
- stopping_(false),
- running_(false),
- thread_(0),
- message_loop_(nullptr),
- message_loop_timer_slack_(TIMER_SLACK_NONE),
- name_(name) {
-}
-
-Thread::~Thread() {
- Stop();
-}
-
-bool Thread::Start() {
- Options options;
-#if defined(OS_WIN)
- if (com_status_ == STA)
- options.message_loop_type = MessageLoop::TYPE_UI;
-#endif
- return StartWithOptions(options);
-}
-
-bool Thread::StartWithOptions(const Options& options) {
- DCHECK(!message_loop_);
-#if defined(OS_WIN)
- DCHECK((com_status_ != STA) ||
- (options.message_loop_type == MessageLoop::TYPE_UI));
-#endif
-
- SetThreadWasQuitProperly(false);
-
- MessageLoop::Type type = options.message_loop_type;
- if (!options.message_pump_factory.is_null())
- type = MessageLoop::TYPE_CUSTOM;
-
- message_loop_timer_slack_ = options.timer_slack;
- scoped_ptr<MessageLoop> message_loop =
- MessageLoop::CreateUnbound(type, options.message_pump_factory);
- message_loop_ = message_loop.get();
- start_event_.reset(new WaitableEvent(false, false));
-
- // Hold the thread_lock_ while starting a new thread, so that we can make sure
- // that thread_ is populated before the newly created thread accesses it.
- {
- AutoLock lock(thread_lock_);
- bool created;
- if (options.priority == ThreadPriority::NORMAL) {
- created = PlatformThread::Create(options.stack_size, this, &thread_);
- } else {
- created = PlatformThread::CreateWithPriority(options.stack_size, this,
- &thread_, options.priority);
- }
- if (!created) {
- DLOG(ERROR) << "failed to create thread";
- message_loop_ = nullptr;
- start_event_.reset();
- return false;
- }
- }
-
- // The ownership of message_loop is managemed by the newly created thread
- // within the ThreadMain.
- ignore_result(message_loop.release());
-
- DCHECK(message_loop_);
- return true;
-}
-
-bool Thread::StartAndWaitForTesting() {
- bool result = Start();
- if (!result)
- return false;
- WaitUntilThreadStarted();
- return true;
-}
-
-bool Thread::WaitUntilThreadStarted() {
- if (!start_event_)
- return false;
- base::ThreadRestrictions::ScopedAllowWait allow_wait;
- start_event_->Wait();
- return true;
-}
-
-void Thread::Stop() {
- if (!start_event_)
- return;
-
- StopSoon();
-
- // Wait for the thread to exit.
- //
- // TODO(darin): Unfortunately, we need to keep message_loop_ around until
- // the thread exits. Some consumers are abusing the API. Make them stop.
- //
- PlatformThread::Join(thread_);
-
- // The thread should NULL message_loop_ on exit.
- DCHECK(!message_loop_);
-
- // The thread no longer needs to be joined.
- start_event_.reset();
-
- stopping_ = false;
-}
-
-void Thread::StopSoon() {
- // We should only be called on the same thread that started us.
-
- DCHECK_NE(thread_id(), PlatformThread::CurrentId());
-
- if (stopping_ || !message_loop_)
- return;
-
- stopping_ = true;
- task_runner()->PostTask(FROM_HERE, base::Bind(&ThreadQuitHelper));
-}
-
-PlatformThreadId Thread::thread_id() const {
- AutoLock lock(thread_lock_);
- return thread_.id();
-}
-
-bool Thread::IsRunning() const {
- // If the thread's already started (i.e. message_loop_ is non-null) and
- // not yet requested to stop (i.e. stopping_ is false) we can just return
- // true. (Note that stopping_ is touched only on the same thread that
- // starts / started the new thread so we need no locking here.)
- if (message_loop_ && !stopping_)
- return true;
- // Otherwise check the running_ flag, which is set to true by the new thread
- // only while it is inside Run().
- AutoLock lock(running_lock_);
- return running_;
-}
-
-void Thread::Run(MessageLoop* message_loop) {
- message_loop->Run();
-}
-
-void Thread::SetThreadWasQuitProperly(bool flag) {
- lazy_tls_bool.Pointer()->Set(flag);
-}
-
-bool Thread::GetThreadWasQuitProperly() {
- bool quit_properly = true;
-#ifndef NDEBUG
- quit_properly = lazy_tls_bool.Pointer()->Get();
-#endif
- return quit_properly;
-}
-
-void Thread::ThreadMain() {
- // Complete the initialization of our Thread object.
- PlatformThread::SetName(name_.c_str());
- ANNOTATE_THREAD_NAME(name_.c_str()); // Tell the name to race detector.
-
- // Lazily initialize the message_loop so that it can run on this thread.
- DCHECK(message_loop_);
- scoped_ptr<MessageLoop> message_loop(message_loop_);
- message_loop_->BindToCurrentThread();
- message_loop_->set_thread_name(name_);
- message_loop_->SetTimerSlack(message_loop_timer_slack_);
-
-#if defined(OS_WIN)
- scoped_ptr<win::ScopedCOMInitializer> com_initializer;
- if (com_status_ != NONE) {
- com_initializer.reset((com_status_ == STA) ?
- new win::ScopedCOMInitializer() :
- new win::ScopedCOMInitializer(win::ScopedCOMInitializer::kMTA));
- }
-#endif
-
- // Make sure the thread_id() returns current thread.
- // (This internally acquires lock against PlatformThread::Create)
- DCHECK_EQ(thread_id(), PlatformThread::CurrentId());
-
- // Let the thread do extra initialization.
- Init();
-
- {
- AutoLock lock(running_lock_);
- running_ = true;
- }
-
- start_event_->Signal();
-
- Run(message_loop_);
-
- {
- AutoLock lock(running_lock_);
- running_ = false;
- }
-
- // Let the thread do extra cleanup.
- CleanUp();
-
-#if defined(OS_WIN)
- com_initializer.reset();
-#endif
-
- // Assert that MessageLoop::Quit was called by ThreadQuitHelper.
- DCHECK(GetThreadWasQuitProperly());
-
- // We can't receive messages anymore.
- // (The message loop is destructed at the end of this block)
- message_loop_ = NULL;
-}
-
-} // namespace base
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