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// Copyright 2010 the V8 project 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 V8_PROFILER_UNBOUND_QUEUE_H_
#define V8_PROFILER_UNBOUND_QUEUE_H_
#include "src/allocation.h"
#include "src/base/atomicops.h"
namespace v8 {
namespace internal {
// Lock-free unbound queue for small records. Intended for
// transferring small records between a Single producer and a Single
// consumer. Doesn't have restrictions on the number of queued
// elements, so producer never blocks. Implemented after Herb
// Sutter's article:
// http://www.ddj.com/high-performance-computing/210604448
template<typename Record>
class UnboundQueue BASE_EMBEDDED {
public:
inline UnboundQueue();
inline ~UnboundQueue();
V8_INLINE bool Dequeue(Record* rec);
V8_INLINE void Enqueue(const Record& rec);
V8_INLINE bool IsEmpty() const;
V8_INLINE Record* Peek() const;
private:
V8_INLINE void DeleteFirst();
struct Node;
Node* first_;
base::AtomicWord divider_; // Node*
base::AtomicWord last_; // Node*
DISALLOW_COPY_AND_ASSIGN(UnboundQueue);
};
} // namespace internal
} // namespace v8
#endif // V8_PROFILER_UNBOUND_QUEUE_H_
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