Index: content/renderer/shared_memory_seqlock_reader.cc |
diff --git a/content/renderer/shared_memory_seqlock_reader.cc b/content/renderer/shared_memory_seqlock_reader.cc |
deleted file mode 100644 |
index 2727aa52f99fd015c5c9d51a9cf026c8040d4d9b..0000000000000000000000000000000000000000 |
--- a/content/renderer/shared_memory_seqlock_reader.cc |
+++ /dev/null |
@@ -1,60 +0,0 @@ |
-// Copyright 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. |
- |
-#include "content/renderer/shared_memory_seqlock_reader.h" |
- |
-namespace content { |
-namespace internal { |
- |
-SharedMemorySeqLockReaderBase::SharedMemorySeqLockReaderBase() { } |
- |
-SharedMemorySeqLockReaderBase::~SharedMemorySeqLockReaderBase() { } |
- |
-void* |
-SharedMemorySeqLockReaderBase::InitializeSharedMemory( |
- base::SharedMemoryHandle shared_memory_handle, size_t buffer_size) { |
- renderer_shared_memory_handle_ = shared_memory_handle; |
- if (!base::SharedMemory::IsHandleValid(renderer_shared_memory_handle_)) |
- return 0; |
- renderer_shared_memory_.reset(new base::SharedMemory( |
- renderer_shared_memory_handle_, true)); |
- |
- return (renderer_shared_memory_->Map(buffer_size)) |
- ? renderer_shared_memory_->memory() |
- : 0; |
-} |
- |
-bool SharedMemorySeqLockReaderBase::FetchFromBuffer( |
- content::OneWriterSeqLock* seqlock, void* final, void* temp, void* from, |
- size_t size) { |
- |
- if (!base::SharedMemory::IsHandleValid(renderer_shared_memory_handle_)) |
- return false; |
- |
- // Only try to read this many times before failing to avoid waiting here |
- // very long in case of contention with the writer. |
- int contention_count = -1; |
- base::subtle::Atomic32 version; |
- do { |
- version = seqlock->ReadBegin(); |
- memcpy(temp, from, size); |
- ++contention_count; |
- if (contention_count == kMaximumContentionCount) |
- break; |
- } while (seqlock->ReadRetry(version)); |
- |
- if (contention_count >= kMaximumContentionCount) { |
- // We failed to successfully read, presumably because the hardware |
- // thread was taking unusually long. Don't copy the data to the output |
- // buffer, and simply leave what was there before. |
- return false; |
- } |
- |
- // New data was read successfully, copy it into the output buffer. |
- memcpy(final, temp, size); |
- return true; |
-} |
- |
-} // namespace internal |
-} // namespace content |