blob: 5931ca47573e4c7f9cba5bdc74d8824a102fc26d [file] [log] [blame]
/*
* 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.
*/
#pragma once
#if ENABLE(ASYNC_SCROLLING)
#include <functional>
#include <wtf/Condition.h>
#include <wtf/Forward.h>
#include <wtf/Function.h>
#include <wtf/Lock.h>
#include <wtf/Noncopyable.h>
#include <wtf/Threading.h>
#include <wtf/Vector.h>
#if PLATFORM(COCOA)
#include <wtf/RetainPtr.h>
#else
#include <wtf/RunLoop.h>
#endif
namespace WebCore {
class ScrollingThread {
WTF_MAKE_NONCOPYABLE(ScrollingThread);
public:
static bool isCurrentThread();
WEBCORE_EXPORT static void dispatch(Function<void ()>&&);
// Will dispatch the given function on the main thread once all pending functions
// on the scrolling thread have finished executing. Used for synchronization purposes.
WEBCORE_EXPORT static void dispatchBarrier(Function<void ()>&&);
private:
friend NeverDestroyed<ScrollingThread>;
ScrollingThread();
static ScrollingThread& singleton();
void createThreadIfNeeded();
void dispatchFunctionsFromScrollingThread();
void initializeRunLoop();
void wakeUpRunLoop();
#if PLATFORM(COCOA)
static void threadRunLoopSourceCallback(void* scrollingThread);
void threadRunLoopSourceCallback();
#endif
RefPtr<Thread> m_thread;
Condition m_initializeRunLoopConditionVariable;
Lock m_initializeRunLoopMutex;
Lock m_functionsMutex;
Vector<Function<void ()>> m_functions;
#if PLATFORM(COCOA)
// FIXME: We should use WebCore::RunLoop here.
RetainPtr<CFRunLoopRef> m_threadRunLoop;
RetainPtr<CFRunLoopSourceRef> m_threadRunLoopSource;
#else
RunLoop* m_runLoop { nullptr };
#endif
};
} // namespace WebCore
#endif // ENABLE(ASYNC_SCROLLING)