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/*
* Copyright (C) 2012, 2015 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 "ScrollingThread.h"
#if ENABLE(ASYNC_SCROLLING)
#include <mutex>
#include <wtf/MainThread.h>
#include <wtf/NeverDestroyed.h>
namespace WebCore {
ScrollingThread::ScrollingThread()
: m_threadIdentifier(0)
{
}
bool ScrollingThread::isCurrentThread()
{
auto threadIdentifier = ScrollingThread::singleton().m_threadIdentifier;
return threadIdentifier && currentThread() == threadIdentifier;
}
void ScrollingThread::dispatch(std::function<void ()> function)
{
auto& scrollingThread = ScrollingThread::singleton();
scrollingThread.createThreadIfNeeded();
{
std::lock_guard<Lock> lock(scrollingThread.m_functionsMutex);
scrollingThread.m_functions.append(function);
}
scrollingThread.wakeUpRunLoop();
}
void ScrollingThread::dispatchBarrier(std::function<void ()> function)
{
dispatch([function]() mutable {
callOnMainThread(WTFMove(function));
});
}
ScrollingThread& ScrollingThread::singleton()
{
static NeverDestroyed<ScrollingThread> scrollingThread;
return scrollingThread;
}
void ScrollingThread::createThreadIfNeeded()
{
if (m_threadIdentifier)
return;
// Wait for the thread to initialize the run loop.
{
std::unique_lock<Lock> lock(m_initializeRunLoopMutex);
m_threadIdentifier = createThread(threadCallback, this, "WebCore: Scrolling");
#if PLATFORM(COCOA)
m_initializeRunLoopConditionVariable.wait(lock, [this]{ return m_threadRunLoop; });
#endif
}
}
void ScrollingThread::threadCallback(void* scrollingThread)
{
WTF::setCurrentThreadIsUserInteractive();
static_cast<ScrollingThread*>(scrollingThread)->threadBody();
}
void ScrollingThread::threadBody()
{
initializeRunLoop();
}
void ScrollingThread::dispatchFunctionsFromScrollingThread()
{
ASSERT(isCurrentThread());
Vector<std::function<void ()>> functions;
{
std::lock_guard<Lock> lock(m_functionsMutex);
functions = WTFMove(m_functions);
}
for (auto& function : functions)
function();
}
} // namespace WebCore
#endif // ENABLE(ASYNC_SCROLLING)
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