content/common/shared_memory_seqlock_buffer.h

   1 // Copyright 2013 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_SHARED_MEMORY_SEQLOCK_BUFFER_H_
   6 #define CONTENT_COMMON_SHARED_MEMORY_SEQLOCK_BUFFER_H_
   7
   8 #include "content/common/one_writer_seqlock.h"
   9
  10 namespace content {
  11
  12 // This structure is stored in shared memory that's shared between the browser
  13 // which does the hardware polling, and the consumers of the data,
  14 // i.e. the renderers. The performance characteristics are that
  15 // we want low latency (so would like to avoid explicit communication via IPC
  16 // between producer and consumer) and relatively large data size.
  17 //
  18 // Writer and reader operate on the same buffer assuming contention is low, and
  19 // contention is detected by using the associated SeqLock.
  20
  21 template<class Data>
  22 class SharedMemorySeqLockBuffer {
  23  public:
  24   OneWriterSeqLock seqlock;
  25   Data data;
  26 };
  27
  28 }  // namespace content
  29
  30 #endif  // CONTENT_COMMON_SHARED_MEMORY_SEQLOCK_BUFFER_H_