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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_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ | 5 #ifndef CONTENT_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ |
| 6 #define CONTENT_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ | 6 #define CONTENT_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ |
| 7 | 7 |
| 8 #include "base/logging.h" | 8 #include "base/logging.h" |
| 9 #include "base/memory/scoped_ptr.h" | 9 #include "base/memory/scoped_ptr.h" |
| 10 #include "base/memory/shared_memory.h" | 10 #include "base/memory/shared_memory.h" |
| 11 #include "content/common/shared_memory_seqlock_buffer.h" | 11 #include "content/common/shared_memory_seqlock_buffer.h" |
| 12 | 12 |
| 13 namespace content { | |
| 14 namespace internal { | 13 namespace internal { |
| 15 | 14 |
| 16 class SharedMemorySeqLockReaderBase { | 15 class SharedMemorySeqLockReaderBase { |
| 17 protected: | 16 protected: |
| 18 SharedMemorySeqLockReaderBase(); | 17 SharedMemorySeqLockReaderBase(); |
| 19 virtual ~SharedMemorySeqLockReaderBase(); | 18 virtual ~SharedMemorySeqLockReaderBase(); |
| 20 | 19 |
| 21 void* InitializeSharedMemory( | 20 void* InitializeSharedMemory( |
| 22 base::SharedMemoryHandle shared_memory_handle, | 21 base::SharedMemoryHandle shared_memory_handle, |
| 23 size_t buffer_size); | 22 size_t buffer_size); |
| 24 | 23 |
| 25 bool FetchFromBuffer(content::OneWriterSeqLock* seqlock, void* final, | 24 bool FetchFromBuffer(content::OneWriterSeqLock* seqlock, void* final, |
| 26 void* temp, void* from, size_t size); | 25 void* temp, void* from, size_t size); |
| 27 | 26 |
| 28 static const int kMaximumContentionCount = 10; | 27 static const int kMaximumContentionCount = 10; |
| 29 base::SharedMemoryHandle renderer_shared_memory_handle_; | 28 base::SharedMemoryHandle renderer_shared_memory_handle_; |
| 30 scoped_ptr<base::SharedMemory> renderer_shared_memory_; | 29 scoped_ptr<base::SharedMemory> renderer_shared_memory_; |
| 31 }; | 30 }; |
| 32 | 31 |
| 33 } // namespace internal | 32 } // namespace internal |
| 34 | 33 |
| 34 namespace content { |
| 35 |
| 35 // Template argument Data should be a pod-like structure only containing | 36 // Template argument Data should be a pod-like structure only containing |
| 36 // data fields, such that it is copyable by memcpy method. | 37 // data fields, such that it is copyable by memcpy method. |
| 37 template<typename Data> | 38 template<typename Data> |
| 38 class SharedMemorySeqLockReader | 39 class SharedMemorySeqLockReader |
| 39 : private internal::SharedMemorySeqLockReaderBase { | 40 : private internal::SharedMemorySeqLockReaderBase { |
| 40 public: | 41 public: |
| 41 SharedMemorySeqLockReader() : buffer_(0) { } | 42 SharedMemorySeqLockReader() : buffer_(0) { } |
| 42 virtual ~SharedMemorySeqLockReader() { } | 43 virtual ~SharedMemorySeqLockReader() { } |
| 43 | 44 |
| 44 bool GetLatestData(Data* data) { | 45 bool GetLatestData(Data* data) { |
| (...skipping 16 matching lines...) Expand all Loading... |
| 61 private: | 62 private: |
| 62 SharedMemorySeqLockBuffer<Data>* buffer_; | 63 SharedMemorySeqLockBuffer<Data>* buffer_; |
| 63 scoped_ptr<Data> temp_buffer_; | 64 scoped_ptr<Data> temp_buffer_; |
| 64 | 65 |
| 65 DISALLOW_COPY_AND_ASSIGN(SharedMemorySeqLockReader); | 66 DISALLOW_COPY_AND_ASSIGN(SharedMemorySeqLockReader); |
| 66 }; | 67 }; |
| 67 | 68 |
| 68 } // namespace content | 69 } // namespace content |
| 69 | 70 |
| 70 #endif // CONTENT_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ | 71 #endif // CONTENT_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ |
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