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1 // Copyright 2011 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_CIRCULAR_QUEUE_INL_H_ | |
6 #define V8_CIRCULAR_QUEUE_INL_H_ | |
7 | |
8 #include "src/circular-queue.h" | |
9 | |
10 namespace v8 { | |
11 namespace internal { | |
12 | |
13 template<typename T, unsigned L> | |
14 SamplingCircularQueue<T, L>::SamplingCircularQueue() | |
15 : enqueue_pos_(buffer_), | |
16 dequeue_pos_(buffer_) { | |
17 } | |
18 | |
19 | |
20 template<typename T, unsigned L> | |
21 SamplingCircularQueue<T, L>::~SamplingCircularQueue() { | |
22 } | |
23 | |
24 | |
25 template<typename T, unsigned L> | |
26 T* SamplingCircularQueue<T, L>::Peek() { | |
27 base::MemoryBarrier(); | |
28 if (base::Acquire_Load(&dequeue_pos_->marker) == kFull) { | |
29 return &dequeue_pos_->record; | |
30 } | |
31 return NULL; | |
32 } | |
33 | |
34 | |
35 template<typename T, unsigned L> | |
36 void SamplingCircularQueue<T, L>::Remove() { | |
37 base::Release_Store(&dequeue_pos_->marker, kEmpty); | |
38 dequeue_pos_ = Next(dequeue_pos_); | |
39 } | |
40 | |
41 | |
42 template<typename T, unsigned L> | |
43 T* SamplingCircularQueue<T, L>::StartEnqueue() { | |
44 base::MemoryBarrier(); | |
45 if (base::Acquire_Load(&enqueue_pos_->marker) == kEmpty) { | |
46 return &enqueue_pos_->record; | |
47 } | |
48 return NULL; | |
49 } | |
50 | |
51 | |
52 template<typename T, unsigned L> | |
53 void SamplingCircularQueue<T, L>::FinishEnqueue() { | |
54 base::Release_Store(&enqueue_pos_->marker, kFull); | |
55 enqueue_pos_ = Next(enqueue_pos_); | |
56 } | |
57 | |
58 | |
59 template<typename T, unsigned L> | |
60 typename SamplingCircularQueue<T, L>::Entry* SamplingCircularQueue<T, L>::Next( | |
61 Entry* entry) { | |
62 Entry* next = entry + 1; | |
63 if (next == &buffer_[L]) return buffer_; | |
64 return next; | |
65 } | |
66 | |
67 } } // namespace v8::internal | |
68 | |
69 #endif // V8_CIRCULAR_QUEUE_INL_H_ | |
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