Index: content/common/shared_memory_seqlock_buffer.h |
diff --git a/content/common/shared_memory_seqlock_buffer.h b/content/common/shared_memory_seqlock_buffer.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..5ac559bcefbebe52eae5bc41682d170a85eecb19 |
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+++ b/content/common/shared_memory_seqlock_buffer.h |
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+// Copyright (c) 2013 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 CONTENT_COMMON_SHARED_MEMORY_SEQLOCK_BUFFER_H_ |
+#define CONTENT_COMMON_SHARED_MEMORY_SEQLOCK_BUFFER_H_ |
+ |
+#include "content/common/one_writer_seqlock.h" |
+ |
+namespace content { |
+ |
+// This structure is stored in shared memory that's shared between the browser |
+// which does the hardware polling, and the consumers of the data, |
+// i.e. the renderers. The performance characteristics are that |
+// we want low latency (so would like to avoid explicit communication via IPC |
+// between producer and consumer) and relatively large data size. |
+// |
+// Writer and reader operate on the same buffer assuming contention is low, and |
+// contention is detected by using the associated SeqLock. |
+ |
+template<class Data> |
+class SharedMemorySeqLockBuffer { |
+ public: |
+ OneWriterSeqLock seqlock; |
+ Data data; |
+}; |
+ |
+} // namespace content |
+ |
+#endif // CONTENT_COMMON_SHARED_MEMORY_SEQLOCK_BUFFER_H_ |