gpu: Thread-safe command buffer state lookup.

gpu/command_buffer/client/cmd_buffer_helper.h

Index: gpu/command_buffer/client/cmd_buffer_helper.h
diff --git a/gpu/command_buffer/client/cmd_buffer_helper.h b/gpu/command_buffer/client/cmd_buffer_helper.h
index 0c0edddfd7bab70bcf9d026f5db2f93f99593a23..4313d4d2c07740d8a8f467bb6b2948c24c48f873 100644
--- a/gpu/command_buffer/client/cmd_buffer_helper.h
+++ b/gpu/command_buffer/client/cmd_buffer_helper.h
@@ -181,10 +181,6 @@ class GPU_EXPORT CommandBufferHelper
 
   int32_t last_token_read() const { return command_buffer_->GetLastToken(); }
 
-  int32_t get_offset() const {
-    return command_buffer_->GetLastState().get_offset;
-  }
-
   // Common Commands
   void Noop(uint32_t skip_count) {
     cmd::Noop* cmd = GetImmediateCmdSpace<cmd::Noop>(
@@ -298,7 +294,7 @@ class GPU_EXPORT CommandBufferHelper
  private:
   // Returns the number of available entries (they may not be contiguous).
   int32_t AvailableEntries() {
-    return (get_offset() - put_ - 1 + total_entry_count_) % total_entry_count_;
+    return (last_get_ - put_ - 1 + total_entry_count_) % total_entry_count_;
   }
 
   void CalcImmediateEntries(int waiting_count);
@@ -325,6 +321,7 @@ class GPU_EXPORT CommandBufferHelper
   int32_t immediate_entry_count_;
   int32_t token_;
   int32_t put_;
+  int32_t last_get_;

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

bikeshed: cached_get_offset_?

[piman, 2016/12/02 19:21:48]

I like cached_get_offset_

[sunnyps, 2016/12/07 03:31:22]

Done.

   int32_t last_put_sent_;
   int32_t last_barrier_put_sent_;