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/*
* Copyright (C) 2017 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 <wtf/CrossThreadTaskHandler.h>
#include <wtf/AutodrainedPool.h>
namespace WTF {
CrossThreadTaskHandler::CrossThreadTaskHandler(ASCIILiteral threadName, AutodrainedPoolForRunLoop useAutodrainedPool)
: m_useAutodrainedPool(useAutodrainedPool)
{
ASSERT(isMainThread());
Locker<Lock> locker(m_taskThreadCreationLock);
Thread::create(threadName, [this] {
taskRunLoop();
if (m_completionCallback)
m_completionCallback();
})->detach();
}
CrossThreadTaskHandler::~CrossThreadTaskHandler()
{
ASSERT(isMainThread());
}
void CrossThreadTaskHandler::postTask(CrossThreadTask&& task)
{
m_taskQueue.append(WTFMove(task));
}
void CrossThreadTaskHandler::postTaskReply(CrossThreadTask&& task)
{
m_taskReplyQueue.append(WTFMove(task));
Locker locker { m_mainThreadReplyLock };
if (m_mainThreadReplyScheduled)
return;
m_mainThreadReplyScheduled = true;
callOnMainThread([this] {
handleTaskRepliesOnMainThread();
});
}
void CrossThreadTaskHandler::taskRunLoop()
{
ASSERT(!isMainThread());
{
Locker<Lock> locker(m_taskThreadCreationLock);
}
while (auto task = m_taskQueue.waitForMessage()) {
std::unique_ptr<AutodrainedPool> autodrainedPool = (m_useAutodrainedPool == AutodrainedPoolForRunLoop::Use) ? makeUnique<AutodrainedPool>() : nullptr;
task.performTask();
}
}
void CrossThreadTaskHandler::handleTaskRepliesOnMainThread()
{
{
Locker locker { m_mainThreadReplyLock };
m_mainThreadReplyScheduled = false;
}
while (auto task = m_taskReplyQueue.tryGetMessage())
task->performTask();
}
void CrossThreadTaskHandler::setCompletionCallback(Function<void ()>&& completionCallback)
{
m_completionCallback = WTFMove(completionCallback);
}
void CrossThreadTaskHandler::kill()
{
m_taskQueue.kill();
m_taskReplyQueue.kill();
}
} // namespace WTF
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