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// Copyright 2018 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/message_loop/message_loop.h"
#include <utility>
#include "base/bind.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/message_loop/message_pump_default.h"
#include "base/message_loop/message_pump_for_io.h"
#include "base/message_loop/message_pump_for_ui.h"
#include "base/optional.h"
#include "base/run_loop.h"
#include "base/task/sequence_manager/sequence_manager.h"
#include "base/task/sequence_manager/sequence_manager_impl.h"
#include "base/task/sequence_manager/task_queue.h"
#include "build/build_config.h"
#if defined(OS_MACOSX)
#include "base/message_loop/message_pump_mac.h"
#endif
namespace base {
MessageLoop::MessageLoop(MessagePumpType type) : MessageLoop(type, nullptr) {
// For TYPE_CUSTOM you must either use
// MessageLoop(std::unique_ptr<MessagePump> pump) or
// MessageLoop::CreateUnbound()
DCHECK_NE(type_, MessagePumpType::CUSTOM);
BindToCurrentThread();
}
MessageLoop::MessageLoop(std::unique_ptr<MessagePump> pump)
: MessageLoop(MessagePumpType::CUSTOM, std::move(pump)) {
BindToCurrentThread();
}
MessageLoop::~MessageLoop() {
// Clean up any unprocessed tasks, but take care: deleting a task could
// result in the addition of more tasks (e.g., via DeleteSoon). This is taken
// care by the queue as it will prevent further tasks from being posted to its
// associated TaskRunner instances.
default_task_queue_->ShutdownTaskQueue();
// If |pump_| is non-null, this message loop has been bound and should be the
// current one on this thread. Otherwise, this loop is being destructed before
// it was bound to a thread, so a different message loop (or no loop at all)
// may be current.
DCHECK((pump_ && IsBoundToCurrentThread()) ||
(!pump_ && !IsBoundToCurrentThread()));
// iOS just attaches to the loop, it doesn't Run it.
// TODO(stuartmorgan): Consider wiring up a Detach().
#if !defined(OS_IOS)
// There should be no active RunLoops on this thread, unless this MessageLoop
// isn't bound to the current thread (see other condition at the top of this
// method).
DCHECK((!pump_ && !IsBoundToCurrentThread()) ||
!RunLoop::IsRunningOnCurrentThread());
#endif // !defined(OS_IOS)
}
bool MessageLoop::IsType(MessagePumpType type) const {
return type_ == type;
}
// TODO(gab): Migrate TaskObservers to RunLoop as part of separating concerns
// between MessageLoop and RunLoop and making MessageLoop a swappable
// implementation detail. http://crbug.com/703346
void MessageLoop::AddTaskObserver(TaskObserver* task_observer) {
DCHECK_CALLED_ON_VALID_THREAD(bound_thread_checker_);
sequence_manager_->AddTaskObserver(task_observer);
}
void MessageLoop::RemoveTaskObserver(TaskObserver* task_observer) {
DCHECK_CALLED_ON_VALID_THREAD(bound_thread_checker_);
sequence_manager_->RemoveTaskObserver(task_observer);
}
bool MessageLoop::IsBoundToCurrentThread() const {
return sequence_manager_->IsBoundToCurrentThread();
}
bool MessageLoop::IsIdleForTesting() {
return sequence_manager_->IsIdleForTesting();
}
//------------------------------------------------------------------------------
// static
std::unique_ptr<MessageLoop> MessageLoop::CreateUnbound(MessagePumpType type) {
return WrapUnique(new MessageLoop(type, nullptr));
}
// static
std::unique_ptr<MessageLoop> MessageLoop::CreateUnbound(
std::unique_ptr<MessagePump> custom_pump) {
return WrapUnique(
new MessageLoop(MessagePumpType::CUSTOM, std::move(custom_pump)));
}
MessageLoop::MessageLoop(MessagePumpType type,
std::unique_ptr<MessagePump> custom_pump)
: sequence_manager_(
sequence_manager::internal::SequenceManagerImpl::CreateUnbound(
sequence_manager::SequenceManager::Settings::Builder()
.SetMessagePumpType(type)
.Build())),
default_task_queue_(CreateDefaultTaskQueue()),
type_(type),
custom_pump_(std::move(custom_pump)) {
// Bound in BindToCurrentThread();
DETACH_FROM_THREAD(bound_thread_checker_);
}
scoped_refptr<sequence_manager::TaskQueue>
MessageLoop::CreateDefaultTaskQueue() {
auto default_task_queue = sequence_manager_->CreateTaskQueue(
sequence_manager::TaskQueue::Spec("default_tq"));
sequence_manager_->SetTaskRunner(default_task_queue->task_runner());
return default_task_queue;
}
void MessageLoop::BindToCurrentThread() {
DCHECK_CALLED_ON_VALID_THREAD(bound_thread_checker_);
thread_id_ = PlatformThread::CurrentId();
DCHECK(!pump_);
std::unique_ptr<MessagePump> pump = CreateMessagePump();
pump_ = pump.get();
DCHECK(!MessageLoopCurrent::IsSet())
<< "should only have one message loop per thread";
sequence_manager_->BindToCurrentThread(std::move(pump));
}
std::unique_ptr<MessagePump> MessageLoop::CreateMessagePump() {
if (custom_pump_) {
return std::move(custom_pump_);
} else {
return MessagePump::Create(type_);
}
}
void MessageLoop::SetTimerSlack(TimerSlack timer_slack) {
sequence_manager_->SetTimerSlack(timer_slack);
}
scoped_refptr<SingleThreadTaskRunner> MessageLoop::task_runner() const {
return sequence_manager_->GetTaskRunner();
}
void MessageLoop::SetTaskRunner(
scoped_refptr<SingleThreadTaskRunner> task_runner) {
DCHECK(task_runner);
sequence_manager_->SetTaskRunner(task_runner);
}
#if !defined(OS_NACL)
//------------------------------------------------------------------------------
// MessageLoopForUI
MessageLoopForUI::MessageLoopForUI(MessagePumpType type) : MessageLoop(type) {
#if defined(OS_ANDROID)
DCHECK(type == MessagePumpType::UI || type == MessagePumpType::JAVA);
#else
DCHECK_EQ(type, MessagePumpType::UI);
#endif
}
#if defined(OS_IOS)
void MessageLoopForUI::Attach() {
sequence_manager_->AttachToMessagePump();
}
#endif // defined(OS_IOS)
#if defined(OS_ANDROID)
void MessageLoopForUI::Abort() {
static_cast<MessagePumpForUI*>(pump_)->Abort();
}
bool MessageLoopForUI::IsAborted() {
return static_cast<MessagePumpForUI*>(pump_)->IsAborted();
}
void MessageLoopForUI::QuitWhenIdle(base::OnceClosure callback) {
static_cast<MessagePumpForUI*>(pump_)->QuitWhenIdle(std::move(callback));
}
#endif // defined(OS_ANDROID)
#if defined(OS_WIN)
void MessageLoopForUI::EnableWmQuit() {
static_cast<MessagePumpForUI*>(pump_)->EnableWmQuit();
}
#endif // defined(OS_WIN)
#endif // !defined(OS_NACL)
} // namespace base
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