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85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
// Copyright 2006-2008 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/message_loop/message_pump_default.h"
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#include "base/auto_reset.h"
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#include "base/logging.h"
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#include "base/synchronization/waitable_event.h"
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#include "build/build_config.h"
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#if BUILDFLAG(IS_APPLE)
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#include <mach/thread_policy.h>
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#include "base/apple/mach_logging.h"
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#include "base/apple/scoped_mach_port.h"
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#include "base/apple/scoped_nsautorelease_pool.h"
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#include "base/threading/threading_features.h"
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#endif
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namespace base {
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MessagePumpDefault::MessagePumpDefault()
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: keep_running_(true),
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event_(WaitableEvent::ResetPolicy::AUTOMATIC,
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WaitableEvent::InitialState::NOT_SIGNALED) {
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event_.declare_only_used_while_idle();
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}
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MessagePumpDefault::~MessagePumpDefault() = default;
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void MessagePumpDefault::Run(Delegate* delegate) {
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AutoReset<bool> auto_reset_keep_running(&keep_running_, true);
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for (;;) {
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#if BUILDFLAG(IS_APPLE)
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apple::ScopedNSAutoreleasePool autorelease_pool;
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#endif
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Delegate::NextWorkInfo next_work_info = delegate->DoWork();
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bool has_more_immediate_work = next_work_info.is_immediate();
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if (!keep_running_) {
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break;
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}
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if (has_more_immediate_work) {
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continue;
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}
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delegate->DoIdleWork();
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if (!keep_running_) {
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break;
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}
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if (next_work_info.delayed_run_time.is_max()) {
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event_.Wait();
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} else {
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event_.TimedWait(next_work_info.remaining_delay());
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}
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// Since event_ is auto-reset, we don't need to do anything special here
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// other than service each delegate method.
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}
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}
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void MessagePumpDefault::Quit() {
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keep_running_ = false;
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}
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void MessagePumpDefault::ScheduleWork() {
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// Since this can be called on any thread, we need to ensure that our Run
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// loop wakes up.
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event_.Signal();
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}
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void MessagePumpDefault::ScheduleDelayedWork(
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const Delegate::NextWorkInfo& next_work_info) {
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// Since this is always called from the same thread as Run(), there is nothing
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// to do as the loop is already running. It will wait in Run() with the
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// correct timeout when it's out of immediate tasks.
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// TODO(gab): Consider removing ScheduleDelayedWork() when all pumps function
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// this way (bit.ly/merge-message-pump-do-work).
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}
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} // namespace base
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