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295f920116
I wrote a script to do this which is attached to the bug. TBR=abarth@chromium.org BUG=435361 Review URL: https://codereview.chromium.org/736373003
48 lines
1.1 KiB
C++
48 lines
1.1 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef SKY_ENGINE_WTF_DOUBLEBUFFEREDDEQUE_H_
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#define SKY_ENGINE_WTF_DOUBLEBUFFEREDDEQUE_H_
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#include "sky/engine/wtf/Deque.h"
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#include "sky/engine/wtf/Noncopyable.h"
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namespace WTF {
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// A helper class for managing double buffered deques, typically where the client locks when appending or swapping.
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template <typename T> class DoubleBufferedDeque {
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WTF_MAKE_NONCOPYABLE(DoubleBufferedDeque);
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public:
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DoubleBufferedDeque()
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: m_activeIndex(0) { }
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void append(const T& value)
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{
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m_queue[m_activeIndex].append(value);
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}
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bool isEmpty() const
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{
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return m_queue[m_activeIndex].isEmpty();
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}
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Deque<T>& swapBuffers()
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{
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int oldIndex = m_activeIndex;
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m_activeIndex ^= 1;
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ASSERT(m_queue[m_activeIndex].isEmpty());
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return m_queue[oldIndex];
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}
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private:
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Deque<T> m_queue[2];
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int m_activeIndex;
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};
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} // namespace WTF
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using WTF::DoubleBufferedDeque;
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#endif // SKY_ENGINE_WTF_DOUBLEBUFFEREDDEQUE_H_
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