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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "JobScheduler.h"
#include "mozilla/gfx/Logging.h"
using namespace std;
namespace mozilla {
namespace gfx {
DWORD __stdcall ThreadCallback(void* threadData);
class WorkerThreadWin32 : public WorkerThread {
public:
explicit WorkerThreadWin32(MultiThreadedJobQueue* aJobQueue)
: WorkerThread(aJobQueue)
{
mThread = ::CreateThread(nullptr, 0, ThreadCallback, static_cast<WorkerThread*>(this), 0, nullptr);
}
~WorkerThreadWin32()
{
::WaitForSingleObject(mThread, INFINITE);
::CloseHandle(mThread);
}
protected:
HANDLE mThread;
};
DWORD __stdcall ThreadCallback(void* threadData)
{
WorkerThread* thread = static_cast<WorkerThread*>(threadData);
thread->Run();
return 0;
}
WorkerThread*
WorkerThread::Create(MultiThreadedJobQueue* aJobQueue)
{
return new WorkerThreadWin32(aJobQueue);
}
bool
MultiThreadedJobQueue::PopJob(Job*& aOutJob, AccessType aAccess)
{
for (;;) {
while (aAccess == BLOCKING && mJobs.empty()) {
{
CriticalSectionAutoEnter lock(&mSection);
if (mShuttingDown) {
return false;
}
}
HANDLE handles[] = { mAvailableEvent, mShutdownEvent };
::WaitForMultipleObjects(2, handles, FALSE, INFINITE);
}
CriticalSectionAutoEnter lock(&mSection);
if (mShuttingDown) {
return false;
}
if (mJobs.empty()) {
if (aAccess == NON_BLOCKING) {
return false;
}
continue;
}
Job* task = mJobs.front();
MOZ_ASSERT(task);
mJobs.pop_front();
if (mJobs.empty()) {
::ResetEvent(mAvailableEvent);
}
aOutJob = task;
return true;
}
}
void
MultiThreadedJobQueue::SubmitJob(Job* aJob)
{
MOZ_ASSERT(aJob);
CriticalSectionAutoEnter lock(&mSection);
mJobs.push_back(aJob);
::SetEvent(mAvailableEvent);
}
void
MultiThreadedJobQueue::ShutDown()
{
{
CriticalSectionAutoEnter lock(&mSection);
mShuttingDown = true;
}
while (mThreadsCount) {
::SetEvent(mAvailableEvent);
::WaitForSingleObject(mShutdownEvent, INFINITE);
}
}
size_t
MultiThreadedJobQueue::NumJobs()
{
CriticalSectionAutoEnter lock(&mSection);
return mJobs.size();
}
bool
MultiThreadedJobQueue::IsEmpty()
{
CriticalSectionAutoEnter lock(&mSection);
return mJobs.empty();
}
void
MultiThreadedJobQueue::RegisterThread()
{
mThreadsCount += 1;
}
void
MultiThreadedJobQueue::UnregisterThread()
{
mSection.Enter();
mThreadsCount -= 1;
bool finishShutdown = mThreadsCount == 0;
mSection.Leave();
if (finishShutdown) {
// Can't touch mSection or any other member from now on because this object
// may get deleted on the main thread after mShutdownEvent is set.
::SetEvent(mShutdownEvent);
}
}
} // namespace
} // namespace
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