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// Copyright 2010 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_UNBOUND_QUEUE_
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#define V8_UNBOUND_QUEUE_
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namespace v8 {
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namespace internal {
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// Lock-free unbound queue for small records. Intended for
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// transferring small records between a Single producer and a Single
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// consumer. Doesn't have restrictions on the number of queued
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// elements, so producer never blocks. Implemented after Herb
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// Sutter's article:
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// http://www.ddj.com/high-performance-computing/210604448
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template<typename Record>
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class UnboundQueue BASE_EMBEDDED {
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public:
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inline UnboundQueue();
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inline ~UnboundQueue();
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INLINE(void Dequeue(Record* rec));
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INLINE(void Enqueue(const Record& rec));
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INLINE(bool IsEmpty()) { return divider_ == last_; }
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INLINE(Record* Peek());
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private:
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INLINE(void DeleteFirst());
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struct Node;
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Node* first_;
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AtomicWord divider_; // Node*
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AtomicWord last_; // Node*
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DISALLOW_COPY_AND_ASSIGN(UnboundQueue);
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};
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} } // namespace v8::internal
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#endif // V8_UNBOUND_QUEUE_
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