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      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 1.
     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  private:
     39   friend class base::RefCountedThreadSafe<SyncPointManager>;
     40   typedef std::vector<base::Closure> ClosureList;
     41   typedef base::hash_map<uint32, ClosureList > SyncPointMap;
     42 
     43   ~SyncPointManager();
     44 
     45   base::ThreadChecker thread_checker_;
     46 
     47   // Protects the 2 fields below. Note: callbacks shouldn't be called with this
     48   // held.
     49   base::Lock lock_;
     50   SyncPointMap sync_point_map_;
     51   uint32 next_sync_point_;
     52 
     53   DISALLOW_COPY_AND_ASSIGN(SyncPointManager);
     54 };
     55 
     56 }  // namespace content
     57 
     58 #endif  // CONTENT_COMMON_GPU_SYNC_POINT_MANAGER_H_
     59