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/*
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "GenericTaskQueue.h"
#include <wtf/MainThread.h>
#include <wtf/NeverDestroyed.h>
namespace WebCore {
TaskDispatcher<Timer>::TaskDispatcher()
: m_weakPtrFactory(this)
{
}
void TaskDispatcher<Timer>::postTask(Function<void()>&& function)
{
m_pendingTasks.append(WTFMove(function));
pendingDispatchers().append(m_weakPtrFactory.createWeakPtr());
if (!sharedTimer().isActive())
sharedTimer().startOneShot(0);
}
Timer& TaskDispatcher<Timer>::sharedTimer()
{
ASSERT(isMainThread());
static NeverDestroyed<Timer> timer(TaskDispatcher<Timer>::sharedTimerFired);
return timer.get();
}
void TaskDispatcher<Timer>::sharedTimerFired()
{
ASSERT(!sharedTimer().isActive());
ASSERT(!pendingDispatchers().isEmpty());
// Copy the pending events first because we don't want to process synchronously the new events
// queued by the JS events handlers that are executed in the loop below.
Deque<WeakPtr<TaskDispatcher<Timer>>> queuedDispatchers = WTFMove(pendingDispatchers());
while (!queuedDispatchers.isEmpty()) {
WeakPtr<TaskDispatcher<Timer>> dispatcher = queuedDispatchers.takeFirst();
if (!dispatcher)
continue;
dispatcher->dispatchOneTask();
}
}
Deque<WeakPtr<TaskDispatcher<Timer>>>& TaskDispatcher<Timer>::pendingDispatchers()
{
ASSERT(isMainThread());
static NeverDestroyed<Deque<WeakPtr<TaskDispatcher<Timer>>>> dispatchers;
return dispatchers.get();
}
void TaskDispatcher<Timer>::dispatchOneTask()
{
ASSERT(!m_pendingTasks.isEmpty());
auto task = m_pendingTasks.takeFirst();
task();
}
}
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