зеркало из https://github.com/mozilla/gecko-dev.git
143 строки
2.7 KiB
C++
143 строки
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef WIN32
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#ifndef MOZILLA_GFX_TASKSCHEDULER_POSIX_H_
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#define MOZILLA_GFX_TASKSCHEDULER_POSIX_H_
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#include <string>
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#include <vector>
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#include <list>
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#include <pthread.h>
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#include <stdint.h>
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#include <stdio.h>
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#include "mozilla/RefPtr.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/gfx/CriticalSection.h"
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#include "mozilla/RefCounted.h"
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namespace mozilla {
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namespace gfx {
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class Job;
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class PosixCondVar;
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class WorkerThread;
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// posix platforms only!
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class PosixCondVar {
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public:
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PosixCondVar() {
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DebugOnly<int> err = pthread_cond_init(&mCond, nullptr);
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MOZ_ASSERT(!err);
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}
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~PosixCondVar() {
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DebugOnly<int> err = pthread_cond_destroy(&mCond);
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MOZ_ASSERT(!err);
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}
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void Wait(CriticalSection* aMutex) {
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DebugOnly<int> err = pthread_cond_wait(&mCond, &aMutex->mMutex);
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MOZ_ASSERT(!err);
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}
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void Broadcast() {
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DebugOnly<int> err = pthread_cond_broadcast(&mCond);
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MOZ_ASSERT(!err);
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}
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protected:
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pthread_cond_t mCond;
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};
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/// A simple and naive multithreaded task queue
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///
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/// The public interface of this class must remain identical to its equivalent
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/// in JobScheduler_win32.h
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class MultiThreadedJobQueue {
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public:
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enum AccessType {
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BLOCKING,
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NON_BLOCKING
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};
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// Producer thread
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MultiThreadedJobQueue();
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// Producer thread
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~MultiThreadedJobQueue();
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// Worker threads
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bool WaitForJob(Job*& aOutJob);
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// Any thread
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bool PopJob(Job*& aOutJob, AccessType aAccess);
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// Any threads
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void SubmitJob(Job* aJob);
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// Producer thread
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void ShutDown();
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// Any thread
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size_t NumJobs();
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// Any thread
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bool IsEmpty();
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// Producer thread
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void RegisterThread();
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// Worker threads
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void UnregisterThread();
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protected:
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std::list<Job*> mJobs;
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CriticalSection mMutex;
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PosixCondVar mAvailableCondvar;
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PosixCondVar mShutdownCondvar;
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int32_t mThreadsCount;
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bool mShuttingDown;
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friend class WorkerThread;
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};
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/// An object that a thread can synchronously wait on.
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/// Usually set by a SetEventJob.
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class EventObject : public external::AtomicRefCounted<EventObject>
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{
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public:
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MOZ_DECLARE_REFCOUNTED_TYPENAME(EventObject)
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EventObject();
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~EventObject();
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/// Synchronously wait until the event is set.
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void Wait();
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/// Return true if the event is set, without blocking.
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bool Peak();
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/// Set the event.
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void Set();
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protected:
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CriticalSection mMutex;
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PosixCondVar mCond;
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bool mIsSet;
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};
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} // namespace
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} // namespace
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#include "JobScheduler.h"
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#endif
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#endif
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