V8 API Reference, 7.2.502.16 (for Deno 0.2.4)
locked-queue-inl.h
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_INL_H_
6 #define V8_LOCKED_QUEUE_INL_H_
7 
8 #include "src/base/atomic-utils.h"
9 #include "src/locked-queue.h"
10 
11 namespace v8 {
12 namespace internal {
13 
14 template <typename Record>
15 struct LockedQueue<Record>::Node : Malloced {
16  Node() : next(nullptr) {}
17  Record value;
19 };
20 
21 
22 template <typename Record>
24  head_ = new Node();
25  CHECK_NOT_NULL(head_);
26  tail_ = head_;
27 }
28 
29 
30 template <typename Record>
32  // Destroy all remaining nodes. Note that we do not destroy the actual values.
33  Node* old_node = nullptr;
34  Node* cur_node = head_;
35  while (cur_node != nullptr) {
36  old_node = cur_node;
37  cur_node = cur_node->next.Value();
38  delete old_node;
39  }
40 }
41 
42 
43 template <typename Record>
44 inline void LockedQueue<Record>::Enqueue(const Record& record) {
45  Node* n = new Node();
46  CHECK_NOT_NULL(n);
47  n->value = record;
48  {
49  base::MutexGuard guard(&tail_mutex_);
50  tail_->next.SetValue(n);
51  tail_ = n;
52  }
53 }
54 
55 
56 template <typename Record>
57 inline bool LockedQueue<Record>::Dequeue(Record* record) {
58  Node* old_head = nullptr;
59  {
60  base::MutexGuard guard(&head_mutex_);
61  old_head = head_;
62  Node* const next_node = head_->next.Value();
63  if (next_node == nullptr) return false;
64  *record = next_node->value;
65  head_ = next_node;
66  }
67  delete old_head;
68  return true;
69 }
70 
71 
72 template <typename Record>
73 inline bool LockedQueue<Record>::IsEmpty() const {
74  base::MutexGuard guard(&head_mutex_);
75  return head_->next.Value() == nullptr;
76 }
77 
78 
79 template <typename Record>
80 inline bool LockedQueue<Record>::Peek(Record* record) const {
81  base::MutexGuard guard(&head_mutex_);
82  Node* const next_node = head_->next.Value();
83  if (next_node == nullptr) return false;
84  *record = next_node->value;
85  return true;
86 }
87 
88 } // namespace internal
89 } // namespace v8
90 
91 #endif // V8_LOCKED_QUEUE_INL_H_
Definition: libplatform.h:13