Index: content/common/shared_memory_seqlock_buffer.h |
diff --git a/content/common/shared_memory_seqlock_buffer.h b/content/common/shared_memory_seqlock_buffer.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..e6ba187715e9a1de179a4318b3ed553d2c0cc6e2 |
--- /dev/null |
+++ b/content/common/shared_memory_seqlock_buffer.h |
@@ -0,0 +1,30 @@ |
+// 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_COMMON_SHARED_MEMORY_SEQLOCK_BUFFER_H_ |
+#define CONTENT_COMMON_SHARED_MEMORY_SEQLOCK_BUFFER_H_ |
+ |
+#include "content/common/gamepad_seqlock.h" |
+ |
+namespace content { |
+ |
+// This structure is stored in shared memory that's shared between the browser |
+// which does the hardware polling, and the consumers of the device motion |
+// data, i.e. the renderers. The performance characteristics are that |
+// we want low latency (so would like to avoid explicit communication via IPC |
+// between producer and consumer) and relatively large data size. |
+// |
+// Writer and reader operate on the same buffer assuming contention is low, and |
+// contention is detected by using the associated SeqLock. |
+ |
+template<class Data> |
+struct SharedMemorySeqLockBuffer { |
+ GamepadSeqLock sequence; |
darin (slow to review)
2013/06/17 20:23:44
nit: seems like GamepadSeqLock needs to be renamed
timvolodine
2013/06/18 16:44:31
Done.
renamed to OneWriterSeqLock.
|
+ Data buffer; |
darin (slow to review)
2013/06/17 20:23:44
nit: maybe "buffer" should be named "data" to matc
timvolodine
2013/06/18 16:44:31
absolutely agree, Done.
|
+ bool is_ready_for_read; |
+}; |
+ |
+} // namespace content |
+ |
+#endif // CONTENT_COMMON_SHARED_MEMORY_SEQLOCK_BUFFER_H_ |