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// Copyright (c) 2006-2008 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_pump_default.h"
#include "base/logging.h"
#include "base/threading/thread_restrictions.h"
#if defined(OS_MACOSX)
#include "base/mac/scoped_nsautorelease_pool.h"
#endif
namespace base {
MessagePumpDefault::MessagePumpDefault()
: keep_running_(true),
event_(false, false) {
}
void MessagePumpDefault::Run(Delegate* delegate) {
DCHECK(keep_running_) << "Quit must have been called outside of Run!";
for (;;) {
#if defined(OS_MACOSX)
mac::ScopedNSAutoreleasePool autorelease_pool;
#endif
bool did_work = delegate->DoWork();
if (!keep_running_)
break;
did_work |= delegate->DoDelayedWork(&delayed_work_time_);
if (!keep_running_)
break;
if (did_work)
continue;
did_work = delegate->DoIdleWork();
if (!keep_running_)
break;
if (did_work)
continue;
base::ThreadRestrictions::ScopedAllowWait allow_wait;
if (delayed_work_time_.is_null()) {
event_.Wait();
} else {
TimeDelta delay = delayed_work_time_ - TimeTicks::Now();
if (delay > TimeDelta()) {
event_.TimedWait(delay);
} else {
// It looks like delayed_work_time_ indicates a time in the past, so we
// need to call DoDelayedWork now.
delayed_work_time_ = TimeTicks();
}
}
// Since event_ is auto-reset, we don't need to do anything special here
// other than service each delegate method.
}
keep_running_ = true;
}
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 TimeTicks& delayed_work_time) {
// We know that we can't be blocked on Wait right now since this method can
// only be called on the same thread as Run, so we only need to update our
// record of how long to sleep when we do sleep.
delayed_work_time_ = delayed_work_time;
}
} // namespace base
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