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
10namespace v8 {
11namespace internal {
12
13template<typename T, unsigned L>
14SamplingCircularQueue<T, L>::SamplingCircularQueue()
15    : enqueue_pos_(buffer_),
16      dequeue_pos_(buffer_) {
17}
18
19
20template<typename T, unsigned L>
21SamplingCircularQueue<T, L>::~SamplingCircularQueue() {
22}
23
24
25template<typename T, unsigned L>
26T* 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
35template<typename T, unsigned L>
36void SamplingCircularQueue<T, L>::Remove() {
37  base::Release_Store(&dequeue_pos_->marker, kEmpty);
38  dequeue_pos_ = Next(dequeue_pos_);
39}
40
41
42template<typename T, unsigned L>
43T* 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
52template<typename T, unsigned L>
53void SamplingCircularQueue<T, L>::FinishEnqueue() {
54  base::Release_Store(&enqueue_pos_->marker, kFull);
55  enqueue_pos_ = Next(enqueue_pos_);
56}
57
58
59template<typename T, unsigned L>
60typename 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_
70