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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 COMPONENTS_SHARED_MEMORY_SEQLOCK_SHARED_MEMORY_SEQLOCK_READER_H_ |
6 #define CONTENT_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ | 6 #define COMPONENTS_SHARED_MEMORY_SEQLOCK_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 "components/shared_memory_seqlock/shared_memory_seqlock_buffer.h" |
12 | 12 |
13 namespace content { | 13 namespace shared_memory_seqlock { |
14 namespace internal { | 14 namespace internal { |
15 | 15 |
16 class SharedMemorySeqLockReaderBase { | 16 class SharedMemorySeqLockReaderBase { |
17 protected: | 17 protected: |
18 SharedMemorySeqLockReaderBase(); | 18 SharedMemorySeqLockReaderBase(); |
19 virtual ~SharedMemorySeqLockReaderBase(); | 19 virtual ~SharedMemorySeqLockReaderBase(); |
20 | 20 |
21 void* InitializeSharedMemory( | 21 void* InitializeSharedMemory(base::SharedMemoryHandle shared_memory_handle, |
22 base::SharedMemoryHandle shared_memory_handle, | 22 size_t buffer_size); |
23 size_t buffer_size); | |
24 | 23 |
25 bool FetchFromBuffer(content::OneWriterSeqLock* seqlock, void* final, | 24 bool FetchFromBuffer(shared_memory_seqlock::OneWriterSeqLock* seqlock, |
26 void* temp, void* from, size_t size); | 25 void* final, |
| 26 void* temp, |
| 27 void* from, |
| 28 size_t size); |
27 | 29 |
28 static const int kMaximumContentionCount = 10; | 30 static const int kMaximumContentionCount = 10; |
29 base::SharedMemoryHandle renderer_shared_memory_handle_; | 31 base::SharedMemoryHandle renderer_shared_memory_handle_; |
30 scoped_ptr<base::SharedMemory> renderer_shared_memory_; | 32 scoped_ptr<base::SharedMemory> renderer_shared_memory_; |
31 }; | 33 }; |
32 | 34 |
33 } // namespace internal | 35 } // namespace internal |
34 | 36 |
35 // Template argument Data should be a pod-like structure only containing | 37 // Template argument Data should be a pod-like structure only containing |
36 // data fields, such that it is copyable by memcpy method. | 38 // data fields, such that it is copyable by memcpy method. |
37 template<typename Data> | 39 template <typename Data> |
38 class SharedMemorySeqLockReader | 40 class SharedMemorySeqLockReader |
39 : private internal::SharedMemorySeqLockReaderBase { | 41 : private internal::SharedMemorySeqLockReaderBase { |
40 public: | 42 public: |
41 SharedMemorySeqLockReader() : buffer_(0) { } | 43 SharedMemorySeqLockReader() : buffer_(0) {} |
42 virtual ~SharedMemorySeqLockReader() { } | 44 virtual ~SharedMemorySeqLockReader() {} |
43 | 45 |
44 bool GetLatestData(Data* data) { | 46 bool GetLatestData(Data* data) { |
45 DCHECK(buffer_); | 47 DCHECK(buffer_); |
46 DCHECK(sizeof(*data) == sizeof(*temp_buffer_)); | 48 DCHECK(sizeof(*data) == sizeof(*temp_buffer_)); |
47 return FetchFromBuffer(&buffer_->seqlock, data, temp_buffer_.get(), | 49 return FetchFromBuffer(&buffer_->seqlock, data, temp_buffer_.get(), |
48 &buffer_->data, sizeof(*temp_buffer_)); | 50 &buffer_->data, sizeof(*temp_buffer_)); |
49 } | 51 } |
50 | 52 |
51 bool Initialize(base::SharedMemoryHandle shared_memory_handle) { | 53 bool Initialize(base::SharedMemoryHandle shared_memory_handle) { |
52 if (void* memory = InitializeSharedMemory( | 54 if (void* memory = InitializeSharedMemory( |
53 shared_memory_handle, sizeof(SharedMemorySeqLockBuffer<Data>))) { | 55 shared_memory_handle, sizeof(SharedMemorySeqLockBuffer<Data>))) { |
54 buffer_ = static_cast<SharedMemorySeqLockBuffer<Data>*>(memory); | 56 buffer_ = static_cast<SharedMemorySeqLockBuffer<Data>*>(memory); |
55 temp_buffer_.reset(new Data); | 57 temp_buffer_.reset(new Data); |
56 return true; | 58 return true; |
57 } | 59 } |
58 return false; | 60 return false; |
59 } | 61 } |
60 | 62 |
61 private: | 63 private: |
62 SharedMemorySeqLockBuffer<Data>* buffer_; | 64 SharedMemorySeqLockBuffer<Data>* buffer_; |
63 scoped_ptr<Data> temp_buffer_; | 65 scoped_ptr<Data> temp_buffer_; |
64 | 66 |
65 DISALLOW_COPY_AND_ASSIGN(SharedMemorySeqLockReader); | 67 DISALLOW_COPY_AND_ASSIGN(SharedMemorySeqLockReader); |
66 }; | 68 }; |
67 | 69 |
68 } // namespace content | 70 } // namespace shared_memory_seqlock |
69 | 71 |
70 #endif // CONTENT_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ | 72 #endif // COMPONENTS_SHARED_MEMORY_SEQLOCK_SHARED_MEMORY_SEQLOCK_READER_H_ |
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