blob: c3efad159503afbd8b1586bf50cf97054f409f49 [file] [log] [blame]
// Copyright 2006-2008 The Chromium Authors
// 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_pump_default.h"
#include "base/auto_reset.h"
#include "base/logging.h"
#include "base/synchronization/waitable_event.h"
#include "build/build_config.h"
#if BUILDFLAG(IS_APPLE)
#include <mach/thread_policy.h>
#include "base/apple/mach_logging.h"
#include "base/apple/scoped_mach_port.h"
#include "base/apple/scoped_nsautorelease_pool.h"
#include "base/threading/threading_features.h"
#endif
namespace base {
MessagePumpDefault::MessagePumpDefault()
: keep_running_(true),
event_(WaitableEvent::ResetPolicy::AUTOMATIC,
WaitableEvent::InitialState::NOT_SIGNALED) {
event_.declare_only_used_while_idle();
}
MessagePumpDefault::~MessagePumpDefault() = default;
void MessagePumpDefault::Run(Delegate* delegate) {
AutoReset<bool> auto_reset_keep_running(&keep_running_, true);
for (;;) {
#if BUILDFLAG(IS_APPLE)
apple::ScopedNSAutoreleasePool autorelease_pool;
#endif
Delegate::NextWorkInfo next_work_info = delegate->DoWork();
bool has_more_immediate_work = next_work_info.is_immediate();
if (!keep_running_)
break;
if (has_more_immediate_work)
continue;
has_more_immediate_work = delegate->DoIdleWork();
if (!keep_running_)
break;
if (has_more_immediate_work)
continue;
if (next_work_info.delayed_run_time.is_max()) {
event_.Wait();
} else {
event_.TimedWait(next_work_info.remaining_delay());
}
// Since event_ is auto-reset, we don't need to do anything special here
// other than service each delegate method.
}
}
void MessagePumpDefault::Quit() {
keep_running_ = false;
}
void MessagePumpDefault::ScheduleWork() {
// Since this can be called on any thread, we need to ensure that our Run
// loop wakes up.
event_.Signal();
}
void MessagePumpDefault::ScheduleDelayedWork(
const Delegate::NextWorkInfo& next_work_info) {
// Since this is always called from the same thread as Run(), there is nothing
// to do as the loop is already running. It will wait in Run() with the
// correct timeout when it's out of immediate tasks.
// TODO(gab): Consider removing ScheduleDelayedWork() when all pumps function
// this way (bit.ly/merge-message-pump-do-work).
}
} // namespace base