gpu/command_buffer/service/sync_point_manager.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef GPU_COMMAND_BUFFER_SERVICE_SYNC_POINT_MANAGER_H_
   6 #define GPU_COMMAND_BUFFER_SERVICE_SYNC_POINT_MANAGER_H_
   7
   8 #include <vector>
   9
  10 #include "base/callback.h"
  11 #include "base/containers/hash_tables.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/synchronization/lock.h"
  15 #include "gpu/gpu_export.h"
  16
  17 namespace base {
  18 class SequenceChecker;
  19 }
  20
  21 namespace gpu {
  22
  23 // This class manages the sync points, which allow cross-channel
  24 // synchronization.
  25 class GPU_EXPORT SyncPointManager
  26     : public base::RefCountedThreadSafe<SyncPointManager> {
  27  public:
  28   // InProcessCommandBuffer allows threaded calls since it can call into
  29   // SyncPointManager from client threads, or from multiple service threads
  30   // used in Android WebView.
  31   static SyncPointManager* Create(bool allow_threaded_calls);
  32
  33   // Generates a sync point, returning its ID. This can me called on any thread.
  34   // IDs start at a random number. Never return 0.
  35   uint32 GenerateSyncPoint();
  36
  37   // Retires a sync point. This will call all the registered callbacks for this
  38   // sync point. This can only be called on the main thread.
  39   void RetireSyncPoint(uint32 sync_point);
  40
  41   // Adds a callback to the sync point. The callback will be called when the
  42   // sync point is retired, or immediately (from within that function) if the
  43   // sync point was already retired (or not created yet). This can only be
  44   // called on the main thread.
  45   void AddSyncPointCallback(uint32 sync_point, const base::Closure& callback);
  46
  47   bool IsSyncPointRetired(uint32 sync_point);
  48
  49  private:
  50   friend class base::RefCountedThreadSafe<SyncPointManager>;
  51   typedef std::vector<base::Closure> ClosureList;
  52   typedef base::hash_map<uint32, ClosureList> SyncPointMap;
  53
  54   explicit SyncPointManager(bool allow_threaded_calls);
  55   ~SyncPointManager();
  56   void CheckSequencedThread();
  57
  58   scoped_ptr<base::SequenceChecker> sequence_checker_;
  59
  60   // Protects the 2 fields below. Note: callbacks shouldn't be called with this
  61   // held.
  62   base::Lock lock_;
  63   SyncPointMap sync_point_map_;
  64   uint32 next_sync_point_;
  65
  66   DISALLOW_COPY_AND_ASSIGN(SyncPointManager);
  67 };
  68
  69 }  // namespace gpu
  70
  71 #endif  // GPU_COMMAND_BUFFER_SERVICE_SYNC_POINT_MANAGER_H_