#include "config.h"
#include "WorkQueue.h"
#include <WebCore/NotImplemented.h>
#include <wtf/Threading.h>
inline WorkQueue::WorkItemWin::WorkItemWin(const Function<void()>& function, WorkQueue* queue)
: m_function(function)
, m_queue(queue)
{
}
PassRefPtr<WorkQueue::WorkItemWin> WorkQueue::WorkItemWin::create(const Function<void()>& function, WorkQueue* queue)
{
return adoptRef(new WorkItemWin(function, queue));
}
WorkQueue::WorkItemWin::~WorkItemWin()
{
}
inline WorkQueue::HandleWorkItem::HandleWorkItem(HANDLE handle, const Function<void()>& function, WorkQueue* queue)
: WorkItemWin(function, queue)
, m_handle(handle)
, m_waitHandle(0)
{
ASSERT_ARG(handle, handle);
}
PassRefPtr<WorkQueue::HandleWorkItem> WorkQueue::HandleWorkItem::createByAdoptingHandle(HANDLE handle, const Function<void()>& function, WorkQueue* queue)
{
return adoptRef(new HandleWorkItem(handle, function, queue));
}
WorkQueue::HandleWorkItem::~HandleWorkItem()
{
::CloseHandle(m_handle);
}
void WorkQueue::handleCallback(void* context, BOOLEAN timerOrWaitFired)
{
ASSERT_ARG(context, context);
ASSERT_ARG(timerOrWaitFired, !timerOrWaitFired);
WorkItemWin* item = static_cast<WorkItemWin*>(context);
WorkQueue* queue = item->queue();
{
MutexLocker lock(queue->m_workItemQueueLock);
queue->m_workItemQueue.append(item);
if (!queue->tryRegisterAsWorkThread()) {
return;
}
}
queue->performWorkOnRegisteredWorkThread();
}
void WorkQueue::registerHandle(HANDLE handle, const Function<void()>& function)
{
RefPtr<HandleWorkItem> handleItem = HandleWorkItem::createByAdoptingHandle(handle, function, this);
{
MutexLocker lock(m_handlesLock);
ASSERT_ARG(handle, !m_handles.contains(handle));
m_handles.set(handle, handleItem);
}
HANDLE waitHandle;
if (!::RegisterWaitForSingleObject(&waitHandle, handle, handleCallback, handleItem.get(), INFINITE, WT_EXECUTEDEFAULT)) {
DWORD error = ::GetLastError();
ASSERT_NOT_REACHED();
}
handleItem->setWaitHandle(waitHandle);
}
void WorkQueue::unregisterAndCloseHandle(HANDLE handle)
{
RefPtr<HandleWorkItem> item;
{
MutexLocker locker(m_handlesLock);
ASSERT_ARG(handle, m_handles.contains(handle));
item = m_handles.take(handle);
}
unregisterWaitAndDestroyItemSoon(item.release());
}
DWORD WorkQueue::workThreadCallback(void* context)
{
ASSERT_ARG(context, context);
WorkQueue* queue = static_cast<WorkQueue*>(context);
if (!queue->tryRegisterAsWorkThread())
return 0;
queue->performWorkOnRegisteredWorkThread();
return 0;
}
void WorkQueue::performWorkOnRegisteredWorkThread()
{
ASSERT(m_isWorkThreadRegistered);
bool isValid = true;
m_workItemQueueLock.lock();
while (isValid && !m_workItemQueue.isEmpty()) {
Vector<RefPtr<WorkItemWin> > workItemQueue;
m_workItemQueue.swap(workItemQueue);
m_workItemQueueLock.unlock();
for (size_t i = 0; i < workItemQueue.size(); ++i) {
MutexLocker locker(m_isValidMutex);
isValid = m_isValid;
if (!isValid)
break;
workItemQueue[i]->function()();
}
m_workItemQueueLock.lock();
}
unregisterAsWorkThread();
m_workItemQueueLock.unlock();
}
void WorkQueue::platformInitialize(const char* name)
{
m_isWorkThreadRegistered = 0;
m_timerQueue = ::CreateTimerQueue();
ASSERT_WITH_MESSAGE(m_timerQueue, "::CreateTimerQueue failed with error %lu", ::GetLastError());
}
bool WorkQueue::tryRegisterAsWorkThread()
{
LONG result = ::InterlockedCompareExchange(&m_isWorkThreadRegistered, 1, 0);
ASSERT(!result || result == 1);
return !result;
}
void WorkQueue::unregisterAsWorkThread()
{
LONG result = ::InterlockedCompareExchange(&m_isWorkThreadRegistered, 0, 1);
ASSERT_UNUSED(result, result == 1);
}
void WorkQueue::platformInvalidate()
{
#if !ASSERT_DISABLED
MutexLocker lock(m_handlesLock);
ASSERT(m_handles.isEmpty());
#endif
::DeleteTimerQueueEx(m_timerQueue, 0);
}
void WorkQueue::dispatch(const Function<void()>& function)
{
MutexLocker locker(m_workItemQueueLock);
m_workItemQueue.append(WorkItemWin::create(function, this));
if (!m_isWorkThreadRegistered)
::QueueUserWorkItem(workThreadCallback, this, WT_EXECUTEDEFAULT);
}
struct TimerContext : public ThreadSafeRefCounted<TimerContext> {
static PassRefPtr<TimerContext> create() { return adoptRef(new TimerContext); }
WorkQueue* queue;
Function<void()> function;
Mutex timerMutex;
HANDLE timer;
private:
TimerContext() : queue(0), timer(0) { }
};
void WorkQueue::timerCallback(void* context, BOOLEAN timerOrWaitFired)
{
ASSERT_ARG(context, context);
ASSERT_UNUSED(timerOrWaitFired, timerOrWaitFired);
RefPtr<TimerContext> timerContext = adoptRef(static_cast<TimerContext*>(context));
timerContext->queue->dispatch(timerContext->function);
MutexLocker lock(timerContext->timerMutex);
ASSERT(timerContext->timer);
ASSERT(timerContext->queue->m_timerQueue);
if (!::DeleteTimerQueueTimer(timerContext->queue->m_timerQueue, timerContext->timer, 0))
ASSERT_WITH_MESSAGE(false, "::DeleteTimerQueueTimer failed with error %lu", ::GetLastError());
}
void WorkQueue::dispatchAfterDelay(const Function<void()>& function, double delay)
{
ASSERT(m_timerQueue);
RefPtr<TimerContext> context = TimerContext::create();
context->queue = this;
context->function = function;
{
MutexLocker lock(context->timerMutex);
if (!::CreateTimerQueueTimer(&context->timer, m_timerQueue, timerCallback, context.get(), delay * 1000, 0, WT_EXECUTEINTIMERTHREAD)) {
ASSERT_WITH_MESSAGE(false, "::CreateTimerQueueTimer failed with error %lu", ::GetLastError());
return;
}
}
context.release().leakRef();
}
void WorkQueue::unregisterWaitAndDestroyItemSoon(PassRefPtr<HandleWorkItem> item)
{
::QueueUserWorkItem(unregisterWaitAndDestroyItemCallback, item.leakRef(), WT_EXECUTEDEFAULT);
}
DWORD WINAPI WorkQueue::unregisterWaitAndDestroyItemCallback(void* context)
{
ASSERT_ARG(context, context);
RefPtr<HandleWorkItem> item = adoptRef(static_cast<HandleWorkItem*>(context));
if (!::UnregisterWaitEx(item->waitHandle(), INVALID_HANDLE_VALUE)) {
DWORD error = ::GetLastError();
ASSERT_NOT_REACHED();
}
return 0;
}