Move OneWriterSeqLock and SharedMemorySeqLockBuffer from content/ to device/base/synchronization

base/synchronization/one_writer_seqlock.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
+// Copyright 2016 The Chromium Authors. All rights reserved.

[timvolodine, 2016/09/23 17:34:27]

pls keep the original creation date (also as in .h file)

 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/common/one_writer_seqlock.h"
+#include "base/synchronization/one_writer_seqlock.h"
 
-namespace content {
+namespace base {
 
-OneWriterSeqLock::OneWriterSeqLock()
-  : sequence_(0) {
-}
+OneWriterSeqLock::OneWriterSeqLock() : sequence_(0) {}
 
 base::subtle::Atomic32 OneWriterSeqLock::ReadBegin() {
   base::subtle::Atomic32 version;
   for (;;) {
     version = base::subtle::NoBarrier_Load(&sequence_);
 
     // If the counter is even, then the associated data might be in a
     // consistent state, so we can try to read.
     if ((version & 1) == 0)
       break;
@@ skipping 17 matching lines @@
   // -- Store fence, write membarrier
 }
 
 void OneWriterSeqLock::WriteEnd() {
   // Increment the sequence to an even number to indicate the completion of
   // a write update.
   // -- Store fence, write membarrier
   base::subtle::Barrier_AtomicIncrement(&sequence_, 1);
 }
 
-} // namespace content
+}  // namespace base