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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_current.h"
#include "base/bind.h"
#include "base/message_loop/message_loop.h"
#include "base/message_loop/message_pump_for_io.h"
#include "base/message_loop/message_pump_for_ui.h"
#include "base/no_destructor.h"
#include "base/threading/thread_local.h"
namespace base {
namespace {
base::ThreadLocalPointer<MessageLoop>* GetTLSMessageLoop() {
static NoDestructor<ThreadLocalPointer<MessageLoop>> lazy_tls_ptr;
return lazy_tls_ptr.get();
}
} // namespace
//------------------------------------------------------------------------------
// MessageLoopCurrent
// static
MessageLoopCurrent MessageLoopCurrent::Get() {
return MessageLoopCurrent(GetTLSMessageLoop()->Get());
}
// static
bool MessageLoopCurrent::IsSet() {
return !!GetTLSMessageLoop()->Get();
}
void MessageLoopCurrent::AddDestructionObserver(
DestructionObserver* destruction_observer) {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
current_->destruction_observers_.AddObserver(destruction_observer);
}
void MessageLoopCurrent::RemoveDestructionObserver(
DestructionObserver* destruction_observer) {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
current_->destruction_observers_.RemoveObserver(destruction_observer);
}
const scoped_refptr<SingleThreadTaskRunner>& MessageLoopCurrent::task_runner()
const {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
return current_->task_runner();
}
void MessageLoopCurrent::SetTaskRunner(
scoped_refptr<SingleThreadTaskRunner> task_runner) {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
current_->SetTaskRunner(std::move(task_runner));
}
bool MessageLoopCurrent::IsIdleForTesting() {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
return current_->IsIdleForTesting();
}
void MessageLoopCurrent::AddTaskObserver(TaskObserver* task_observer) {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
current_->AddTaskObserver(task_observer);
}
void MessageLoopCurrent::RemoveTaskObserver(TaskObserver* task_observer) {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
current_->RemoveTaskObserver(task_observer);
}
void MessageLoopCurrent::SetNestableTasksAllowed(bool allowed) {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
if (allowed) {
// Kick the native pump just in case we enter a OS-driven nested message
// loop that does not go through RunLoop::Run().
current_->pump_->ScheduleWork();
}
current_->task_execution_allowed_ = allowed;
}
bool MessageLoopCurrent::NestableTasksAllowed() const {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
return current_->task_execution_allowed_;
}
MessageLoopCurrent::ScopedNestableTaskAllower::ScopedNestableTaskAllower()
: loop_(GetTLSMessageLoop()->Get()),
old_state_(loop_->NestableTasksAllowed()) {
loop_->SetNestableTasksAllowed(true);
}
MessageLoopCurrent::ScopedNestableTaskAllower::~ScopedNestableTaskAllower() {
loop_->SetNestableTasksAllowed(old_state_);
}
// static
void MessageLoopCurrent::BindToCurrentThreadInternal(MessageLoop* current) {
DCHECK(!GetTLSMessageLoop()->Get())
<< "Can't register a second MessageLoop on the same thread.";
GetTLSMessageLoop()->Set(current);
}
// static
void MessageLoopCurrent::UnbindFromCurrentThreadInternal(MessageLoop* current) {
DCHECK_EQ(current, GetTLSMessageLoop()->Get());
GetTLSMessageLoop()->Set(nullptr);
}
bool MessageLoopCurrent::IsBoundToCurrentThreadInternal(
MessageLoop* message_loop) {
return GetTLSMessageLoop()->Get() == message_loop;
}
#if !defined(OS_NACL) && !defined(OS_ANDROID)
//------------------------------------------------------------------------------
// MessageLoopCurrentForUI
// static
MessageLoopCurrentForUI MessageLoopCurrentForUI::Get() {
MessageLoop* loop = GetTLSMessageLoop()->Get();
DCHECK(loop);
#if defined(OS_ANDROID)
DCHECK(loop->IsType(MessageLoop::TYPE_UI) ||
loop->IsType(MessageLoop::TYPE_JAVA));
#else // defined(OS_ANDROID)
DCHECK(loop->IsType(MessageLoop::TYPE_UI));
#endif // defined(OS_ANDROID)
auto* loop_for_ui = static_cast<MessageLoopForUI*>(loop);
return MessageLoopCurrentForUI(
loop_for_ui, static_cast<MessagePumpForUI*>(loop_for_ui->pump_.get()));
}
// static
bool MessageLoopCurrentForUI::IsSet() {
MessageLoop* loop = GetTLSMessageLoop()->Get();
return loop &&
#if defined(OS_ANDROID)
(loop->IsType(MessageLoop::TYPE_UI) ||
loop->IsType(MessageLoop::TYPE_JAVA));
#else // defined(OS_ANDROID)
loop->IsType(MessageLoop::TYPE_UI);
#endif // defined(OS_ANDROID)
}
#if defined(USE_OZONE) && !defined(OS_FUCHSIA) && !defined(OS_WIN)
bool MessageLoopCurrentForUI::WatchFileDescriptor(
int fd,
bool persistent,
MessagePumpForUI::Mode mode,
MessagePumpForUI::FdWatchController* controller,
MessagePumpForUI::FdWatcher* delegate) {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
return pump_->WatchFileDescriptor(fd, persistent, mode, controller, delegate);
}
#endif
#if defined(OS_IOS)
void MessageLoopCurrentForUI::Attach() {
static_cast<MessageLoopForUI*>(current_)->Attach();
}
#endif // defined(OS_IOS)
#if defined(OS_ANDROID)
void MessageLoopCurrentForUI::Abort() {
static_cast<MessageLoopForUI*>(current_)->Abort();
}
#endif // defined(OS_ANDROID)
#endif // !defined(OS_NACL) && !defined(OS_ANDROID)
//------------------------------------------------------------------------------
// MessageLoopCurrentForIO
// static
MessageLoopCurrentForIO MessageLoopCurrentForIO::Get() {
MessageLoop* loop = GetTLSMessageLoop()->Get();
DCHECK(loop);
DCHECK_EQ(MessageLoop::TYPE_IO, loop->type());
auto* loop_for_io = static_cast<MessageLoopForIO*>(loop);
return MessageLoopCurrentForIO(
loop_for_io, static_cast<MessagePumpForIO*>(loop_for_io->pump_.get()));
}
// static
bool MessageLoopCurrentForIO::IsSet() {
MessageLoop* loop = GetTLSMessageLoop()->Get();
return loop && loop->IsType(MessageLoop::TYPE_IO);
}
#if !defined(OS_NACL_SFI)
#if defined(OS_WIN)
HRESULT MessageLoopCurrentForIO::RegisterIOHandler(
HANDLE file,
MessagePumpForIO::IOHandler* handler) {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
return pump_->RegisterIOHandler(file, handler);
}
bool MessageLoopCurrentForIO::RegisterJobObject(
HANDLE job,
MessagePumpForIO::IOHandler* handler) {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
return pump_->RegisterJobObject(job, handler);
}
bool MessageLoopCurrentForIO::WaitForIOCompletion(
DWORD timeout,
MessagePumpForIO::IOHandler* filter) {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
return pump_->WaitForIOCompletion(timeout, filter);
}
#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
bool MessageLoopCurrentForIO::WatchFileDescriptor(
int fd,
bool persistent,
MessagePumpForIO::Mode mode,
MessagePumpForIO::FdWatchController* controller,
MessagePumpForIO::FdWatcher* delegate) {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
return pump_->WatchFileDescriptor(fd, persistent, mode, controller, delegate);
}
#endif // defined(OS_WIN)
#endif // !defined(OS_NACL_SFI)
#if defined(OS_FUCHSIA)
// Additional watch API for native platform resources.
bool MessageLoopCurrentForIO::WatchZxHandle(
zx_handle_t handle,
bool persistent,
zx_signals_t signals,
MessagePumpForIO::ZxHandleWatchController* controller,
MessagePumpForIO::ZxHandleWatcher* delegate) {
DCHECK_CALLED_ON_VALID_THREAD(current_->bound_thread_checker_);
return pump_->WatchZxHandle(handle, persistent, signals, controller,
delegate);
}
#endif
} // namespace base
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