InternalThreadPool.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * vim: set ts=8 sts=2 et sw=2 tw=80:

 * 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/. */

/*

 * An internal thread pool, used for the shell and when

 * JS::SetHelperThreadTaskCallback not called.

*/

#ifndef vm_InternalThreadPool_h

#define vm_InternalThreadPool_h

#include "js/AllocPolicy.h"

#include "js/UniquePtr.h"

#include "js/Vector.h"

#include "threading/ConditionVariable.h"

#include "threading/ProtectedData.h"

namespace JS {

class HelperThreadTask;

};

namespace js {

class AutoLockHelperThreadState;

class HelperThread;

using JS::HelperThreadTask;

using HelperThreadVector =

    Vector<UniquePtr<HelperThread>, 0, SystemAllocPolicy>;

using HelperTaskVector = Vector<HelperThreadTask*, 0, SystemAllocPolicy>;

class InternalThreadPool {

 public:

  static bool Initialize(size_t threadCount, AutoLockHelperThreadState& lock);

  static void ShutDown(AutoLockHelperThreadState& lock);

  static bool IsInitialized() { return Instance; }

  static InternalThreadPool& Get();

  bool ensureThreadCount(size_t threadCount, AutoLockHelperThreadState& lock);

  size_t threadCount(const AutoLockHelperThreadState& lock);

  size_t sizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf,

                             const AutoLockHelperThreadState& lock) const;

 private:

  static void DispatchTask(HelperThreadTask* task);

  void dispatchOrQueueTask(HelperThreadTask* task);

  void maybeDispatchQueuedTask();

  void shutDown(AutoLockHelperThreadState& lock);

  HelperThreadVector& threads(const AutoLockHelperThreadState& lock);

  const HelperThreadVector& threads(

      const AutoLockHelperThreadState& lock) const;

  void setThreadFree(uint32_t threadId);

  void clearThreadFree(uint32_t threadId);

  friend class HelperThread;

  static InternalThreadPool* Instance;

  HelperThreadLockData<HelperThreadVector> threads_;

  HelperThreadLockData<bool> terminating;

  HelperThreadLockData<uint32_t> freeThreadSet;

};

}  // namespace js

#endif /* vm_InternalThreadPool_h */