Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 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_ |
| 6 | #define V8_LOCKED_QUEUE_ |
| 7 | |
| 8 | #include "src/allocation.h" |
| 9 | #include "src/base/platform/platform.h" |
| 10 | |
| 11 | namespace v8 { |
| 12 | namespace 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 |
| 19 | template <typename Record> |
| 20 | class LockedQueue final BASE_EMBEDDED { |
| 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_ |