gpu: Thread-safe command buffer state lookup.

gpu/command_buffer/client/gpu_control.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_H_
 #define GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 75 matching lines @@
   // need to be flushed before they can be shared with other contexts across
   // channels. Subclasses should implement these functions and take care of
   // figuring out when a fence sync has been flushed. The difference between
   // IsFenceSyncFlushed and IsFenceSyncFlushReceived, one is testing is the
   // client has issued the flush, and the other is testing if the service
   // has received the flush.
   virtual uint64_t GenerateFenceSyncRelease() = 0;
   virtual bool IsFenceSyncRelease(uint64_t release) = 0;
   virtual bool IsFenceSyncFlushed(uint64_t release) = 0;
   virtual bool IsFenceSyncFlushReceived(uint64_t release) = 0;
+  virtual bool IsFenceSyncReleased(uint64_t release) = 0;

[sunnyps, 2016/12/02 02:52:03]

Need a better name for this...

This is the only truly "fast" thread-safe method in CommandBufferProxyImpl.
Maybe the name should reflect that?

 
   // Runs |callback| when sync token is signalled.
   virtual void SignalSyncToken(const SyncToken& sync_token,
                                const base::Closure& callback) = 0;
 
   // Under some circumstances a sync token may be used which has not been
   // verified to have been flushed. For example, fence syncs queued on the
   // same channel as the wait command guarantee that the fence sync will
   // be enqueued first so does not need to be flushed.
   virtual bool CanWaitUnverifiedSyncToken(const SyncToken* sync_token) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GpuControl);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_H_