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Side by Side Diff: content/renderer/shared_memory_seqlock_reader.h

Issue 676953005: Revert of Replace Chrome IPC with Mojo IPC for querying BatteryStatus service (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years, 1 month ago
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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
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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