ScrollingThread.cpp [plain text]
#include "config.h"
#include "ScrollingThread.h"
#if ENABLE(ASYNC_SCROLLING)
#include <mutex>
#include <wtf/MainThread.h>
#include <wtf/NeverDestroyed.h>
namespace WebCore {
ScrollingThread::ScrollingThread()
: m_threadIdentifier(0)
{
}
bool ScrollingThread::isCurrentThread()
{
auto threadIdentifier = ScrollingThread::singleton().m_threadIdentifier;
return threadIdentifier && currentThread() == threadIdentifier;
}
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_threadIdentifier)
return;
{
std::unique_lock<Lock> lock(m_initializeRunLoopMutex);
m_threadIdentifier = createThread(threadCallback, this, "WebCore: Scrolling");
#if PLATFORM(COCOA)
m_initializeRunLoopConditionVariable.wait(lock, [this]{ return m_threadRunLoop; });
#endif
}
}
void ScrollingThread::threadCallback(void* scrollingThread)
{
WTF::setCurrentThreadIsUserInteractive();
static_cast<ScrollingThread*>(scrollingThread)->threadBody();
}
void ScrollingThread::threadBody()
{
initializeRunLoop();
}
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();
}
}
#endif // ENABLE(ASYNC_SCROLLING)