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// Copyright 2015 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_UTILS_LOCKED_QUEUE_H_
#define V8_UTILS_LOCKED_QUEUE_H_
#include "src/base/platform/platform.h"
#include "src/utils/allocation.h"
namespace v8 {
namespace internal {
// Simple lock-based unbounded size queue (multi producer; multi consumer) based
// on "Simple, Fast, and Practical Non-Blocking and Blocking Concurrent Queue
// Algorithms" by M. Scott and M. Michael.
// See:
// https://www.cs.rochester.edu/research/synchronization/pseudocode/queues.html
template <typename Record>
class LockedQueue final {
public:
inline LockedQueue();
LockedQueue(const LockedQueue&) = delete;
LockedQueue& operator=(const LockedQueue&) = delete;
inline ~LockedQueue();
inline void Enqueue(Record record);
inline bool Dequeue(Record* record);
inline bool IsEmpty() const;
inline bool Peek(Record* record) const;
private:
struct Node;
mutable base::Mutex head_mutex_;
base::Mutex tail_mutex_;
Node* head_;
Node* tail_;
};
} // namespace internal
} // namespace v8
#endif // V8_UTILS_LOCKED_QUEUE_H_
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