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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CONTENT_COMMON_SHARED_MEMORY_SEQLOCK_BUFFER_H_ | 5 #ifndef DEVICE_GENERIC_SENSOR_SHARED_MEMORY_SEQLOCK_BUFFER_H_ |
6 #define CONTENT_COMMON_SHARED_MEMORY_SEQLOCK_BUFFER_H_ | 6 #define DEVICE_GENERIC_SENSOR_SHARED_MEMORY_SEQLOCK_BUFFER_H_ |
7 | 7 |
8 #include "content/common/one_writer_seqlock.h" | 8 #include "device/generic_sensor/one_writer_seqlock.h" |
9 | 9 |
10 namespace content { | 10 namespace device { |
11 | 11 |
12 // This structure is stored in shared memory that's shared between the browser | 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, | 13 // which does the hardware polling, and the consumers of the data, |
14 // i.e. the renderers. The performance characteristics are that | 14 // i.e. the renderers. The performance characteristics are that |
15 // we want low latency (so would like to avoid explicit communication via IPC | 15 // we want low latency (so would like to avoid explicit communication via IPC |
16 // between producer and consumer) and relatively large data size. | 16 // between producer and consumer) and relatively large data size. |
17 // | 17 // |
18 // Writer and reader operate on the same buffer assuming contention is low, and | 18 // Writer and reader operate on the same buffer assuming contention is low, and |
19 // contention is detected by using the associated SeqLock. | 19 // contention is detected by using the associated SeqLock. |
20 | 20 |
21 template<class Data> | 21 template <class Data> |
22 class SharedMemorySeqLockBuffer { | 22 class SharedMemorySeqLockBuffer { |
23 public: | 23 public: |
24 OneWriterSeqLock seqlock; | 24 OneWriterSeqLock seqlock; |
25 Data data; | 25 Data data; |
26 }; | 26 }; |
27 | 27 |
28 } // namespace content | 28 } // namespace content |
29 | 29 |
30 #endif // CONTENT_COMMON_SHARED_MEMORY_SEQLOCK_BUFFER_H_ | 30 #endif // DEVICE_GENERIC_SENSOR_SHARED_MEMORY_SEQLOCK_BUFFER_H_ |
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