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/*
* Copyright (C) 2012 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.
*/
#ifndef ScrollingThread_h
#define ScrollingThread_h
#if ENABLE(THREADED_SCROLLING)
#include <wtf/Functional.h>
#include <wtf/Noncopyable.h>
#include <wtf/Threading.h>
#include <wtf/Vector.h>
#if PLATFORM(MAC)
#include <wtf/RetainPtr.h>
#endif
namespace WebCore {
class ScrollingThread {
WTF_MAKE_NONCOPYABLE(ScrollingThread);
public:
static bool isCurrentThread();
static void dispatch(const 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.
static void dispatchBarrier(const Function<void()>&);
private:
ScrollingThread();
static ScrollingThread& shared();
void createThreadIfNeeded();
static void threadCallback(void* scrollingThread);
void threadBody();
void dispatchFunctionsFromScrollingThread();
void initializeRunLoop();
void wakeUpRunLoop();
#if PLATFORM(MAC)
static void threadRunLoopSourceCallback(void* scrollingThread);
void threadRunLoopSourceCallback();
#endif
ThreadIdentifier m_threadIdentifier;
ThreadCondition m_initializeRunLoopCondition;
Mutex m_initializeRunLoopConditionMutex;
Mutex m_functionsMutex;
Vector<Function<void()> > m_functions;
#if PLATFORM(MAC)
// FIXME: We should use WebCore::RunLoop here.
RetainPtr<CFRunLoopRef> m_threadRunLoop;
RetainPtr<CFRunLoopSourceRef> m_threadRunLoopSource;
#endif
};
} // namespace WebCore
#endif // ENABLE(THREADED_SCROLLING)
#endif // ScrollingThread_h
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