tor-browser

The Tor Browser
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MediaSystemResourceManager.h (2163B)

      1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim:set ts=2 sw=2 sts=2 et cindent: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
      5 * You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #if !defined(MediaSystemResourceManager_h_)
      8 #  define MediaSystemResourceManager_h_
      9 
     10 #  include <queue>
     11 
     12 #  include "MediaSystemResourceTypes.h"
     13 #  include "mozilla/ReentrantMonitor.h"
     14 #  include "mozilla/StaticPtr.h"
     15 #  include "nsISupportsImpl.h"
     16 #  include "nsTHashMap.h"
     17 
     18 namespace mozilla {
     19 
     20 namespace media {
     21 class MediaSystemResourceManagerChild;
     22 }  // namespace media
     23 
     24 class MediaSystemResourceClient;
     25 class MediaSystemResourceReservationListener;
     26 class ReentrantMonitor;
     27 class TaskQueue;
     28 
     29 /**
     30 * Manage media system resource allocation requests within a process.
     31 */
     32 class MediaSystemResourceManager {
     33 public:
     34  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MediaSystemResourceManager)
     35 
     36  static MediaSystemResourceManager* Get();
     37  static void Init();
     38  static void Shutdown();
     39 
     40  void OnIpcClosed();
     41 
     42  void Register(MediaSystemResourceClient* aClient);
     43  void Unregister(MediaSystemResourceClient* aClient);
     44 
     45  bool SetListener(MediaSystemResourceClient* aClient,
     46                   MediaSystemResourceReservationListener* aListener);
     47 
     48  void Acquire(MediaSystemResourceClient* aClient);
     49  bool AcquireSyncNoWait(MediaSystemResourceClient* aClient);
     50  void ReleaseResource(MediaSystemResourceClient* aClient);
     51 
     52  void RecvResponse(uint32_t aId, bool aSuccess);
     53 
     54 private:
     55  MediaSystemResourceManager();
     56  virtual ~MediaSystemResourceManager();
     57 
     58  void OpenIPC();
     59  void CloseIPC();
     60  bool IsIpcClosed();
     61 
     62  void DoAcquire(uint32_t aId);
     63 
     64  void DoRelease(uint32_t aId);
     65 
     66  void HandleAcquireResult(uint32_t aId, bool aSuccess);
     67 
     68  ReentrantMonitor mReentrantMonitor MOZ_UNANNOTATED;
     69 
     70  bool mShutDown;
     71 
     72  media::MediaSystemResourceManagerChild* mChild;
     73 
     74  nsTHashMap<nsUint32HashKey, MediaSystemResourceClient*> mResourceClients;
     75 
     76  static StaticRefPtr<MediaSystemResourceManager> sSingleton;
     77 };
     78 
     79 }  // namespace mozilla
     80 
     81 #endif