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1 // Copyright (c) 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_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ | |
6 #define CONTENT_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ | |
7 | |
8 #include "shared_memory_seqlock_reader_base.h" | |
9 | |
10 namespace content { | |
11 | |
darin (slow to review)
2013/06/24 23:40:34
nit: it is common to put the *Base class here insi
timvolodine
2013/06/25 03:36:07
Done.
| |
12 // Template argument Data should be a pod-like structure only containing | |
13 // data fields, such that it is copyable by memcpy method. | |
14 template<typename Data> | |
15 class SharedMemorySeqLockReader : private SharedMemorySeqLockReaderBase { | |
scottmg
2013/06/24 23:24:38
was the intention that this be the generic reader?
timvolodine
2013/06/25 03:36:07
The new reader class largely implements the origin
| |
16 public: | |
17 SharedMemorySeqLockReader() : buffer_(0) { } | |
18 virtual ~SharedMemorySeqLockReader() { } | |
19 | |
20 bool GetLatestData(Data* data) { | |
21 DCHECK(buffer_); | |
22 DCHECK(sizeof(*data) == sizeof(*temp_buffer_)); | |
23 return FetchFromBuffer(data, temp_buffer_.get(), &buffer_->data, | |
24 sizeof(*temp_buffer_)); | |
25 } | |
26 | |
27 bool Initialize(base::SharedMemoryHandle shared_memory_handle) { | |
28 SharedMemorySeqLockBufferBase* memory = InitializeSharedMemory( | |
29 shared_memory_handle, sizeof(SharedMemorySeqLockBuffer<Data>)); | |
30 if (memory) { | |
31 buffer_ = static_cast<SharedMemorySeqLockBuffer<Data>*>(memory); | |
32 temp_buffer_.reset(new Data); | |
33 return true; | |
34 } | |
35 return false; | |
36 } | |
37 | |
38 private: | |
39 SharedMemorySeqLockBuffer<Data>* buffer_; | |
40 scoped_ptr<Data> temp_buffer_; | |
41 | |
42 DISALLOW_COPY_AND_ASSIGN(SharedMemorySeqLockReader); | |
43 }; | |
44 | |
45 } // namespace content | |
46 | |
47 #endif // CONTENT_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ | |
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