1// Copyright 2015 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_LOCKED_QUEUE_H_
6#define V8_LOCKED_QUEUE_H_
7
8#include "src/allocation.h"
9#include "src/base/platform/platform.h"
10
11namespace v8 {
12namespace internal {
13
14// Simple lock-based unbounded size queue (multi producer; multi consumer) based
15// on "Simple, Fast, and Practical Non-Blocking and Blocking Concurrent Queue
16// Algorithms" by M. Scott and M. Michael.
17// See:
18// https://www.cs.rochester.edu/research/synchronization/pseudocode/queues.html
19template <typename Record>
20class LockedQueue final {
21 public:
22 inline LockedQueue();
23 inline ~LockedQueue();
24 inline void Enqueue(const Record& record);
25 inline bool Dequeue(Record* record);
26 inline bool IsEmpty() const;
27 inline bool Peek(Record* record) const;
28
29 private:
30 struct Node;
31
32 mutable base::Mutex head_mutex_;
33 base::Mutex tail_mutex_;
34 Node* head_;
35 Node* tail_;
36
37 DISALLOW_COPY_AND_ASSIGN(LockedQueue);
38};
39
40} // namespace internal
41} // namespace v8
42
43#endif // V8_LOCKED_QUEUE_H_
44