CompositeProcessFencesHolderMap.h

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/* 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 MOZILLA_GFX_CompositeProcessFencesHolderMap_H

#define MOZILLA_GFX_CompositeProcessFencesHolderMap_H

#include <vector>

#include "mozilla/Monitor.h"

#include "mozilla/StaticPtr.h"

#include "mozilla/gfx/FileHandleWrapper.h"

#include "mozilla/layers/LayersTypes.h"

namespace mozilla {

namespace layers {

class Fence;

/**

 * A class to manage Fence that is shared in Composite process.

*/

class CompositeProcessFencesHolderMap {

 public:

  static void Init();

  static void Shutdown();

  static CompositeProcessFencesHolderMap* Get() { return sInstance; }

  CompositeProcessFencesHolderMap() = default;

  ~CompositeProcessFencesHolderMap() = default;

  void Register(const CompositeProcessFencesHolderId aHolderId);

  void RegisterReference(const CompositeProcessFencesHolderId aHolderId);

  void Unregister(const CompositeProcessFencesHolderId aHolderId);

  void SetWriteFence(const CompositeProcessFencesHolderId aHolderId,

                     RefPtr<Fence> aWriteFence);

  void SetReadFence(const CompositeProcessFencesHolderId aHolderId,

                    RefPtr<Fence> aReadFence);

  RefPtr<Fence> GetWriteFence(const CompositeProcessFencesHolderId aHolderId);

  std::vector<RefPtr<Fence>> TakeAllFencesAndForget(

      const CompositeProcessFencesHolderId aHolderId);

 private:

  struct FencesHolder {

    FencesHolder() = default;

    RefPtr<Fence> mWriteFence;

    std::vector<RefPtr<Fence>> mReadFences;

    uint32_t mOwners = 1;

};

  mutable Monitor mMonitor{"CompositeProcessFencesHolderMap::mMonitor"};

  std::unordered_map<CompositeProcessFencesHolderId, UniquePtr<FencesHolder>,

                     CompositeProcessFencesHolderId::HashFn>

      mFencesHolderById MOZ_GUARDED_BY(mMonitor);

  static StaticAutoPtr<CompositeProcessFencesHolderMap> sInstance;

};

}  // namespace layers

}  // namespace mozilla

#endif /* MOZILLA_GFX_CompositeProcessFencesHolderMap_H */