/* * 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] { WTF::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)