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// 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 "remoting/base/auto_thread.h"
#include "base/bind.h"
#include "base/lazy_instance.h"
#include "base/third_party/dynamic_annotations/dynamic_annotations.h"
#include "base/threading/thread_local.h"
#include "base/threading/thread_restrictions.h"
#include "base/synchronization/waitable_event.h"
#include "remoting/base/auto_thread_task_runner.h"
namespace remoting {
// Used to pass data to ThreadMain. This structure is allocated on the stack
// from within StartWithType.
struct AutoThread::StartupData {
MessageLoop::Type loop_type;
// Used to receive the AutoThreadTaskRunner for the thread.
scoped_refptr<AutoThreadTaskRunner> task_runner;
// Used to synchronize thread startup.
base::WaitableEvent event;
explicit StartupData(MessageLoop::Type type)
: loop_type(type),
event(false, false) {}
};
// static
scoped_refptr<AutoThreadTaskRunner> AutoThread::CreateWithType(
const char* name,
scoped_refptr<AutoThreadTaskRunner> joiner,
MessageLoop::Type type) {
AutoThread* thread = new AutoThread(name, joiner);
scoped_refptr<AutoThreadTaskRunner> task_runner = thread->StartWithType(type);
if (task_runner.get()) {
return task_runner;
} else {
delete thread;
return NULL;
}
}
// static
scoped_refptr<AutoThreadTaskRunner> AutoThread::Create(
const char* name, scoped_refptr<AutoThreadTaskRunner> joiner) {
return CreateWithType(name, joiner, MessageLoop::TYPE_DEFAULT);
}
AutoThread::AutoThread(const char* name)
: startup_data_(NULL),
thread_(0),
name_(name),
was_quit_properly_(false) {
}
AutoThread::AutoThread(const char* name, AutoThreadTaskRunner* joiner)
: startup_data_(NULL),
thread_(0),
name_(name),
was_quit_properly_(false),
joiner_(joiner) {
}
AutoThread::~AutoThread() {
DCHECK(!startup_data_);
// Wait for the thread to exit.
if (thread_) {
base::PlatformThread::Join(thread_);
}
}
scoped_refptr<AutoThreadTaskRunner>
AutoThread::StartWithType(MessageLoop::Type type) {
DCHECK(!thread_);
StartupData startup_data(type);
startup_data_ = &startup_data;
if (!base::PlatformThread::Create(0, this, &thread_)) {
DLOG(ERROR) << "failed to create thread";
startup_data_ = NULL;
return NULL;
}
// Wait for the thread to start and initialize message_loop_
// TODO(wez): Since at this point we know the MessageLoop _will_ run, and
// the thread lifetime is controlled by the AutoThreadTaskRunner, we would
// ideally return the AutoThreadTaskRunner to the caller without waiting for
// the thread to signal us.
base::ThreadRestrictions::ScopedAllowWait allow_wait;
startup_data.event.Wait();
// set it to NULL so we don't keep a pointer to some object on the stack.
startup_data_ = NULL;
DCHECK(startup_data.task_runner.get());
return startup_data.task_runner;
}
scoped_refptr<AutoThreadTaskRunner> AutoThread::Start() {
return StartWithType(MessageLoop::TYPE_DEFAULT);
}
void AutoThread::QuitThread(
scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
if (!task_runner->BelongsToCurrentThread()) {
task_runner->PostTask(FROM_HERE, base::Bind(&AutoThread::QuitThread,
base::Unretained(this),
task_runner));
return;
}
MessageLoop::current()->Quit();
was_quit_properly_ = true;
if (joiner_) {
joiner_->PostTask(FROM_HERE, base::Bind(&AutoThread::JoinAndDeleteThread,
base::Unretained(this)));
}
}
void AutoThread::JoinAndDeleteThread() {
delete this;
}
void AutoThread::ThreadMain() {
// The message loop for this thread.
MessageLoop message_loop(startup_data_->loop_type);
// Complete the initialization of our AutoThread object.
base::PlatformThread::SetName(name_.c_str());
ANNOTATE_THREAD_NAME(name_.c_str()); // Tell the name to race detector.
message_loop.set_thread_name(name_);
// Return an AutoThreadTaskRunner that will cleanly quit this thread when
// no more references to it remain.
startup_data_->task_runner =
new AutoThreadTaskRunner(message_loop.message_loop_proxy(),
base::Bind(&AutoThread::QuitThread,
base::Unretained(this),
message_loop.message_loop_proxy()));
startup_data_->event.Signal();
// startup_data_ can't be touched anymore since the starting thread is now
// unlocked.
message_loop.Run();
// Assert that MessageLoop::Quit was called by AutoThread::QuitThread.
DCHECK(was_quit_properly_);
}
} // namespace base
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