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/synchronization/lock.h"
  14 #include "base/threading/thread_checker.h"
  15 #include "gpu/gpu_export.h"
  16
  17 namespace gpu {
  18
  19 // This class manages the sync points, which allow cross-channel
  20 // synchronization.
  21 class GPU_EXPORT SyncPointManager
  22     : public base::RefCountedThreadSafe<SyncPointManager> {
  23  public:
  24   SyncPointManager();
  25
  26   // Generates a sync point, returning its ID. This can me called on any thread.
  27   // IDs start at a random number. Never return 0.
  28   uint32 GenerateSyncPoint();
  29
  30   // Retires a sync point. This will call all the registered callbacks for this
  31   // sync point. This can only be called on the main thread.
  32   void RetireSyncPoint(uint32 sync_point);
  33
  34   // Adds a callback to the sync point. The callback will be called when the
  35   // sync point is retired, or immediately (from within that function) if the
  36   // sync point was already retired (or not created yet). This can only be
  37   // called on the main thread.
  38   void AddSyncPointCallback(uint32 sync_point, const base::Closure& callback);
  39
  40   bool IsSyncPointRetired(uint32 sync_point);
  41
  42  private:
  43   friend class base::RefCountedThreadSafe<SyncPointManager>;
  44   typedef std::vector<base::Closure> ClosureList;
  45   typedef base::hash_map<uint32, ClosureList> SyncPointMap;
  46
  47   ~SyncPointManager();
  48
  49   base::ThreadChecker thread_checker_;
  50
  51   // Protects the 2 fields below. Note: callbacks shouldn't be called with this
  52   // held.
  53   base::Lock lock_;
  54   SyncPointMap sync_point_map_;
  55   uint32 next_sync_point_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(SyncPointManager);
  58 };
  59
  60 }  // namespace gpu
  61
  62 #endif  // GPU_COMMAND_BUFFER_SERVICE_SYNC_POINT_MANAGER_H_