The Tor Browser: comparison ipc/chromium/src/base/thread.cc

--1:000000000000
+:c28757964ed6
+// Copyright (c) 2006-2009 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/thread.h"
+#include "base/lazy_instance.h"
+#include "base/string_util.h"
+#include "base/thread_local.h"
+#include "base/waitable_event.h"
+#include "GeckoProfiler.h"
+#include "mozilla/IOInterposer.h"
+#ifdef MOZ_TASK_TRACER
+#include "GeckoTaskTracer.h"
+#endif
+namespace base {
+// This task is used to trigger the message loop to exit.
+class ThreadQuitTask : public Task {
+public:
+virtual void Run() {
+MessageLoop::current()->Quit();
+Thread::SetThreadWasQuitProperly(true);
+}
+};
+// Used to pass data to ThreadMain.  This structure is allocated on the stack
+// from within StartWithOptions.
+struct Thread::StartupData {
+// We get away with a const reference here because of how we are allocated.
+const Thread::Options& options;
+// Used to synchronize thread startup.
+WaitableEvent event;
+explicit StartupData(const Options& opt)
+: options(opt),
+event(false, false) {}
+};
+Thread::Thread(const char *name)
+: startup_data_(NULL),
+thread_(0),
+message_loop_(NULL),
+thread_id_(0),
+name_(name) {
+}
+Thread::~Thread() {
+Stop();
+}
+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::Quit() is called directly, which is unexpected when using a
+// Thread to setup and run a MessageLoop.
+base::LazyInstance<base::ThreadLocalBoolean> lazy_tls_bool(
+base::LINKER_INITIALIZED);
+}  // namespace
+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;
+}
+bool Thread::Start() {
+return StartWithOptions(Options());
+}
+bool Thread::StartWithOptions(const Options& options) {
+DCHECK(!message_loop_);
+SetThreadWasQuitProperly(false);
+StartupData startup_data(options);
+startup_data_ = &startup_data;
+if (!PlatformThread::Create(options.stack_size, this, &thread_)) {
+DLOG(ERROR) << "failed to create thread";
+startup_data_ = NULL;  // Record that we failed to start.
+return false;
+}
+// Wait for the thread to start and initialize message_loop_
+startup_data.event.Wait();
+DCHECK(message_loop_);
+return true;
+}
+void Thread::Stop() {
+if (!thread_was_started())
+return;
+// We should only be called on the same thread that started us.
+DCHECK_NE(thread_id_, PlatformThread::CurrentId());
+// StopSoon may have already been called.
+if (message_loop_)
+message_loop_->PostTask(FROM_HERE, new ThreadQuitTask());
+// Wait for the thread to exit.  It should already have terminated but make
+// sure this assumption is valid.
+//
+// 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 can't receive messages anymore.
+message_loop_ = NULL;
+// The thread no longer needs to be joined.
+startup_data_ = NULL;
+}
+void Thread::StopSoon() {
+if (!message_loop_)
+return;
+// We should only be called on the same thread that started us.
+DCHECK_NE(thread_id_, PlatformThread::CurrentId());
+// We had better have a message loop at this point!  If we do not, then it
+// most likely means that the thread terminated unexpectedly, probably due
+// to someone calling Quit() on our message loop directly.
+DCHECK(message_loop_);
+message_loop_->PostTask(FROM_HERE, new ThreadQuitTask());
+}
+void Thread::ThreadMain() {
+char aLocal;
+profiler_register_thread(name_.c_str(), &aLocal);
+mozilla::IOInterposer::RegisterCurrentThread();
+// The message loop for this thread.
+MessageLoop message_loop(startup_data_->options.message_loop_type);
+// Complete the initialization of our Thread object.
+thread_id_ = PlatformThread::CurrentId();
+PlatformThread::SetName(name_.c_str());
+message_loop.set_thread_name(name_);
+message_loop.set_hang_timeouts(startup_data_->options.transient_hang_timeout,
+startup_data_->options.permanent_hang_timeout);
+message_loop_ = &message_loop;
+// Let the thread do extra initialization.
+// Let's do this before signaling we are started.
+Init();
+startup_data_->event.Signal();
+// startup_data_ can't be touched anymore since the starting thread is now
+// unlocked.
+message_loop.Run();
+// Let the thread do extra cleanup.
+CleanUp();
+// Assert that MessageLoop::Quit was called by ThreadQuitTask.
+DCHECK(GetThreadWasQuitProperly());
+mozilla::IOInterposer::UnregisterCurrentThread();
+profiler_unregister_thread();
+#ifdef MOZ_TASK_TRACER
+mozilla::tasktracer::FreeTraceInfo();
+#endif
+// We can't receive messages anymore.
+message_loop_ = NULL;
+thread_id_ = 0;
+}
+}  // namespace base

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comparison: ipc/chromium/src/base/thread.cc

ipc/chromium/src/base/thread.cc