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