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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.
*/
#include "config.h"
#include "ScrollingThread.h"
#if ENABLE(THREADED_SCROLLING)
#include <wtf/MainThread.h>
namespace WebCore {
ScrollingThread::ScrollingThread()
: m_threadIdentifier(0)
{
}
bool ScrollingThread::isCurrentThread()
{
if (!shared().m_threadIdentifier)
return false;
return currentThread() == shared().m_threadIdentifier;
}
void ScrollingThread::dispatch(const Function<void()>& function)
{
shared().createThreadIfNeeded();
{
MutexLocker locker(shared().m_functionsMutex);
shared().m_functions.append(function);
}
shared().wakeUpRunLoop();
}
static void callFunctionOnMainThread(const Function<void()>* function)
{
callOnMainThread(*function);
delete function;
}
void ScrollingThread::dispatchBarrier(const Function<void()>& function)
{
dispatch(bind(callFunctionOnMainThread, new Function<void()>(function)));
}
ScrollingThread& ScrollingThread::shared()
{
DEFINE_STATIC_LOCAL(ScrollingThread, scrollingThread, ());
return scrollingThread;
}
void ScrollingThread::createThreadIfNeeded()
{
if (m_threadIdentifier)
return;
// Wait for the thread to initialize the run loop.
{
MutexLocker locker(m_initializeRunLoopConditionMutex);
m_threadIdentifier = createThread(threadCallback, this, "WebCore: Scrolling");
#if PLATFORM(MAC)
while (!m_threadRunLoop)
m_initializeRunLoopCondition.wait(m_initializeRunLoopConditionMutex);
#endif
}
}
void ScrollingThread::threadCallback(void* scrollingThread)
{
static_cast<ScrollingThread*>(scrollingThread)->threadBody();
}
void ScrollingThread::threadBody()
{
initializeRunLoop();
}
void ScrollingThread::dispatchFunctionsFromScrollingThread()
{
ASSERT(isCurrentThread());
Vector<Function<void()> > functions;
{
MutexLocker locker(m_functionsMutex);
m_functions.swap(functions);
}
for (size_t i = 0; i < functions.size(); ++i)
functions[i]();
}
} // namespace WebCore
#endif // ENABLE(THREADED_SCROLLING)