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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(SCROLLING_THREAD)
#include <mutex>
#include <wtf/MainThread.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/threads/BinarySemaphore.h>
namespace WebCore {
ScrollingThread& ScrollingThread::singleton()
{
static LazyNeverDestroyed<ScrollingThread> scrollingThread;
static std::once_flag onceFlag;
std::call_once(onceFlag, [] {
scrollingThread.construct();
});
return scrollingThread;
}
ScrollingThread::ScrollingThread()
{
BinarySemaphore semaphore;
m_thread = Thread::create("WebCore: Scrolling", [this, &semaphore] {
Thread::setCurrentThreadIsUserInteractive();
m_runLoop = &RunLoop::current();
semaphore.signal();
m_runLoop->run();
});
semaphore.wait();
}
bool ScrollingThread::isCurrentThread()
{
return ScrollingThread::singleton().m_thread == &Thread::current();
}
void ScrollingThread::dispatch(Function<void ()>&& function)
{
ScrollingThread::singleton().runLoop().dispatch(WTFMove(function));
}
void ScrollingThread::dispatchBarrier(Function<void ()>&& function)
{
dispatch([function = WTFMove(function)]() mutable {
callOnMainThread(WTFMove(function));
});
}
} // namespace WebCore
#endif // ENABLE(SCROLLING_THREAD)