GMPSharedMemManager.h

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/* -*- Mode: C++; tab-width: 2; 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/. */

#ifndef GMPSharedMemManager_h_

#define GMPSharedMemManager_h_

#include "mozilla/ipc/Shmem.h"

#include "nsTArray.h"

namespace mozilla::gmp {

enum class GMPSharedMemClass { Decoded, Encoded };

class GMPSharedMemManager {

 public:

  GMPSharedMemManager() = default;

  virtual ~GMPSharedMemManager();

  bool MgrTakeShmem(GMPSharedMemClass aClass, ipc::Shmem* aMem);

  bool MgrTakeShmem(GMPSharedMemClass aClass, size_t aSize, ipc::Shmem* aMem);

  void MgrGiveShmem(GMPSharedMemClass aClass, ipc::Shmem&& aMem);

  void MgrPurgeShmems();

  virtual bool MgrAllocShmem(size_t aSize, ipc::Shmem* aMem) { return false; }

  virtual void MgrDeallocShmem(ipc::Shmem& aMem) = 0;

 protected:

  virtual bool MgrIsOnOwningThread() const = 0;

  static constexpr size_t kMaxPools = 2;

 private:

  void PurgeSmallerShmem(nsTArray<ipc::Shmem>& aPool, size_t aSize);

  static constexpr size_t kMaxPoolLength = 16;

  AutoTArray<ipc::Shmem, kMaxPoolLength> mPool[kMaxPools];

};

}  // namespace mozilla::gmp

#endif  // GMPSharedMemManager_h_