V8 API Reference, 7.2.502.16 (for Deno 0.2.4)
circular-queue-inl.h
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_PROFILER_CIRCULAR_QUEUE_INL_H_
6 #define V8_PROFILER_CIRCULAR_QUEUE_INL_H_
7 
8 #include "src/profiler/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 template <typename T, unsigned L>
20 SamplingCircularQueue<T, L>::~SamplingCircularQueue() = default;
21 
22 template<typename T, unsigned L>
23 T* SamplingCircularQueue<T, L>::Peek() {
24  base::SeqCst_MemoryFence();
25  if (base::Acquire_Load(&dequeue_pos_->marker) == kFull) {
26  return &dequeue_pos_->record;
27  }
28  return nullptr;
29 }
30 
31 
32 template<typename T, unsigned L>
33 void SamplingCircularQueue<T, L>::Remove() {
34  base::Release_Store(&dequeue_pos_->marker, kEmpty);
35  dequeue_pos_ = Next(dequeue_pos_);
36 }
37 
38 
39 template<typename T, unsigned L>
40 T* SamplingCircularQueue<T, L>::StartEnqueue() {
41  base::SeqCst_MemoryFence();
42  if (base::Acquire_Load(&enqueue_pos_->marker) == kEmpty) {
43  return &enqueue_pos_->record;
44  }
45  return nullptr;
46 }
47 
48 
49 template<typename T, unsigned L>
50 void SamplingCircularQueue<T, L>::FinishEnqueue() {
51  base::Release_Store(&enqueue_pos_->marker, kFull);
52  enqueue_pos_ = Next(enqueue_pos_);
53 }
54 
55 
56 template<typename T, unsigned L>
57 typename SamplingCircularQueue<T, L>::Entry* SamplingCircularQueue<T, L>::Next(
58  Entry* entry) {
59  Entry* next = entry + 1;
60  if (next == &buffer_[L]) return buffer_;
61  return next;
62 }
63 
64 } // namespace internal
65 } // namespace v8
66 
67 #endif // V8_PROFILER_CIRCULAR_QUEUE_INL_H_
Definition: libplatform.h:13