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/*
* Copyright (C) 2013 Google 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
* 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 "core/dom/MainThreadTaskRunner.h"
#include "core/dom/Document.h"
#include "core/dom/ExecutionContextTask.h"
#include "wtf/Assertions.h"
namespace WebCore {
struct PerformTaskContext {
WTF_MAKE_NONCOPYABLE(PerformTaskContext); WTF_MAKE_FAST_ALLOCATED;
public:
PerformTaskContext(WeakPtr<MainThreadTaskRunner> runner, PassOwnPtr<ExecutionContextTask> task)
: m_runner(runner)
, m_task(task)
{
}
WeakPtr<MainThreadTaskRunner> m_runner;
OwnPtr<ExecutionContextTask> m_task;
static void didReceiveTask(void* untypedContext);
};
void PerformTaskContext::didReceiveTask(void* untypedContext)
{
ASSERT(isMainThread());
OwnPtr<PerformTaskContext> self = adoptPtr(static_cast<PerformTaskContext*>(untypedContext));
ASSERT(self);
MainThreadTaskRunner* runner = self->m_runner.get();
if (!runner)
return;
runner->perform(self->m_task.release());
}
MainThreadTaskRunner::MainThreadTaskRunner(ExecutionContext* context)
: m_context(context)
, m_weakFactory(this)
, m_pendingTasksTimer(this, &MainThreadTaskRunner::pendingTasksTimerFired)
, m_suspended(false)
{
}
MainThreadTaskRunner::~MainThreadTaskRunner()
{
}
void MainThreadTaskRunner::postTask(PassOwnPtr<ExecutionContextTask> task)
{
callOnMainThread(PerformTaskContext::didReceiveTask, new PerformTaskContext(m_weakFactory.createWeakPtr(), task));
}
void MainThreadTaskRunner::perform(PassOwnPtr<ExecutionContextTask> task)
{
if (m_context->tasksNeedSuspension() || !m_pendingTasks.isEmpty()) {
m_pendingTasks.append(task);
return;
}
task->performTask(m_context);
}
void MainThreadTaskRunner::suspend()
{
ASSERT(!m_suspended);
m_pendingTasksTimer.stop();
m_suspended = true;
}
void MainThreadTaskRunner::resume()
{
ASSERT(m_suspended);
if (!m_pendingTasks.isEmpty())
m_pendingTasksTimer.startOneShot(0, FROM_HERE);
m_suspended = false;
}
void MainThreadTaskRunner::pendingTasksTimerFired(Timer<MainThreadTaskRunner>*)
{
while (!m_pendingTasks.isEmpty()) {
OwnPtr<ExecutionContextTask> task = m_pendingTasks[0].release();
m_pendingTasks.remove(0);
task->performTask(m_context);
}
}
} // namespace
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