Index: content/renderer/shared_memory_seqlock_reader.h |
diff --git a/content/renderer/shared_memory_seqlock_reader.h b/content/renderer/shared_memory_seqlock_reader.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..9b268e3db00331a93b80c15aaff87547d0edd0d4 |
--- /dev/null |
+++ b/content/renderer/shared_memory_seqlock_reader.h |
@@ -0,0 +1,47 @@ |
+// Copyright (c) 2013 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef CONTENT_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ |
+#define CONTENT_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ |
+ |
+#include "shared_memory_seqlock_reader_base.h" |
+ |
+namespace content { |
+ |
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.
|
+// Template argument Data should be a pod-like structure only containing |
+// data fields, such that it is copyable by memcpy method. |
+template<typename Data> |
+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
|
+ public: |
+ SharedMemorySeqLockReader() : buffer_(0) { } |
+ virtual ~SharedMemorySeqLockReader() { } |
+ |
+ bool GetLatestData(Data* data) { |
+ DCHECK(buffer_); |
+ DCHECK(sizeof(*data) == sizeof(*temp_buffer_)); |
+ return FetchFromBuffer(data, temp_buffer_.get(), &buffer_->data, |
+ sizeof(*temp_buffer_)); |
+ } |
+ |
+ bool Initialize(base::SharedMemoryHandle shared_memory_handle) { |
+ SharedMemorySeqLockBufferBase* memory = InitializeSharedMemory( |
+ shared_memory_handle, sizeof(SharedMemorySeqLockBuffer<Data>)); |
+ if (memory) { |
+ buffer_ = static_cast<SharedMemorySeqLockBuffer<Data>*>(memory); |
+ temp_buffer_.reset(new Data); |
+ return true; |
+ } |
+ return false; |
+ } |
+ |
+ private: |
+ SharedMemorySeqLockBuffer<Data>* buffer_; |
+ scoped_ptr<Data> temp_buffer_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(SharedMemorySeqLockReader); |
+}; |
+ |
+} // namespace content |
+ |
+#endif // CONTENT_RENDERER_SHARED_MEMORY_SEQLOCK_READER_H_ |