| /* |
| * 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() |
| { |
| } |
| |
| bool ScrollingThread::isCurrentThread() |
| { |
| return ScrollingThread::singleton().m_thread == &Thread::current(); |
| } |
| |
| void ScrollingThread::dispatch(Function<void ()>&& function) |
| { |
| auto& scrollingThread = ScrollingThread::singleton(); |
| scrollingThread.createThreadIfNeeded(); |
| |
| { |
| std::lock_guard<Lock> lock(scrollingThread.m_functionsMutex); |
| scrollingThread.m_functions.append(WTFMove(function)); |
| } |
| |
| scrollingThread.wakeUpRunLoop(); |
| } |
| |
| void ScrollingThread::dispatchBarrier(Function<void ()>&& function) |
| { |
| dispatch([function = WTFMove(function)]() mutable { |
| callOnMainThread(WTFMove(function)); |
| }); |
| } |
| |
| ScrollingThread& ScrollingThread::singleton() |
| { |
| static NeverDestroyed<ScrollingThread> scrollingThread; |
| |
| return scrollingThread; |
| } |
| |
| void ScrollingThread::createThreadIfNeeded() |
| { |
| if (m_thread) |
| return; |
| |
| // Wait for the thread to initialize the run loop. |
| { |
| std::unique_lock<Lock> lock(m_initializeRunLoopMutex); |
| |
| m_thread = Thread::create("WebCore: Scrolling", [this] { |
| WTF::Thread::setCurrentThreadIsUserInteractive(); |
| initializeRunLoop(); |
| }); |
| |
| #if PLATFORM(COCOA) |
| m_initializeRunLoopConditionVariable.wait(lock, [this]{ return m_threadRunLoop; }); |
| #endif |
| } |
| } |
| |
| void ScrollingThread::dispatchFunctionsFromScrollingThread() |
| { |
| ASSERT(isCurrentThread()); |
| |
| Vector<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) |