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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 #include "content/renderer/shared_memory_seqlock_reader.h" | 5 #include "device/sensors/public/cpp/shared_memory_seqlock_reader.h" |
| 6 | 6 |
| 7 namespace content { | 7 namespace device { |
| 8 namespace internal { | 8 namespace internal { |
| 9 | 9 |
| 10 SharedMemorySeqLockReaderBase::SharedMemorySeqLockReaderBase() { } | 10 SharedMemorySeqLockReaderBase::SharedMemorySeqLockReaderBase() {} |
| 11 | 11 |
| 12 SharedMemorySeqLockReaderBase::~SharedMemorySeqLockReaderBase() { } | 12 SharedMemorySeqLockReaderBase::~SharedMemorySeqLockReaderBase() {} |
| 13 | 13 |
| 14 void* | 14 void* SharedMemorySeqLockReaderBase::InitializeSharedMemory( |
| 15 SharedMemorySeqLockReaderBase::InitializeSharedMemory( | 15 base::SharedMemoryHandle shared_memory_handle, |
| 16 base::SharedMemoryHandle shared_memory_handle, size_t buffer_size) { | 16 size_t buffer_size) { |
| 17 renderer_shared_memory_handle_ = shared_memory_handle; | 17 renderer_shared_memory_handle_ = shared_memory_handle; |
| 18 if (!base::SharedMemory::IsHandleValid(renderer_shared_memory_handle_)) | 18 if (!base::SharedMemory::IsHandleValid(renderer_shared_memory_handle_)) |
| 19 return 0; | 19 return 0; |
| 20 renderer_shared_memory_.reset(new base::SharedMemory( | 20 renderer_shared_memory_.reset( |
| 21 renderer_shared_memory_handle_, true)); | 21 new base::SharedMemory(renderer_shared_memory_handle_, true)); |
| 22 | 22 |
| 23 return (renderer_shared_memory_->Map(buffer_size)) | 23 return (renderer_shared_memory_->Map(buffer_size)) |
| 24 ? renderer_shared_memory_->memory() | 24 ? renderer_shared_memory_->memory() |
| 25 : 0; | 25 : 0; |
| 26 } | 26 } |
| 27 | 27 |
| 28 bool SharedMemorySeqLockReaderBase::FetchFromBuffer( | 28 bool SharedMemorySeqLockReaderBase::FetchFromBuffer( |
| 29 device::OneWriterSeqLock* seqlock, | 29 device::OneWriterSeqLock* seqlock, |
| 30 void* final, | 30 void* final, |
| 31 void* temp, | 31 void* temp, |
| 32 void* from, | 32 void* from, |
| 33 size_t size) { | 33 size_t size) { |
| 34 if (!base::SharedMemory::IsHandleValid(renderer_shared_memory_handle_)) | 34 if (!base::SharedMemory::IsHandleValid(renderer_shared_memory_handle_)) |
| 35 return false; | 35 return false; |
| (...skipping 16 matching lines...) Expand all Loading... |
| 52 // buffer, and simply leave what was there before. | 52 // buffer, and simply leave what was there before. |
| 53 return false; | 53 return false; |
| 54 } | 54 } |
| 55 | 55 |
| 56 // New data was read successfully, copy it into the output buffer. | 56 // New data was read successfully, copy it into the output buffer. |
| 57 memcpy(final, temp, size); | 57 memcpy(final, temp, size); |
| 58 return true; | 58 return true; |
| 59 } | 59 } |
| 60 | 60 |
| 61 } // namespace internal | 61 } // namespace internal |
| 62 } // namespace content | 62 } // namespace device |
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