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// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_LOCKED_QUEUE_INL_
#define V8_LOCKED_QUEUE_INL_
#include "src/atomic-utils.h"
#include "src/locked-queue.h"
namespace v8 {
namespace internal {
template <typename Record>
struct LockedQueue<Record>::Node : Malloced {
Node() : next(nullptr) {}
Record value;
AtomicValue<Node*> next;
};
template <typename Record>
inline LockedQueue<Record>::LockedQueue() {
head_ = new Node();
CHECK(head_ != nullptr);
tail_ = head_;
}
template <typename Record>
inline LockedQueue<Record>::~LockedQueue() {
// Destroy all remaining nodes. Note that we do not destroy the actual values.
Node* old_node = nullptr;
Node* cur_node = head_;
while (cur_node != nullptr) {
old_node = cur_node;
cur_node = cur_node->next.Value();
delete old_node;
}
}
template <typename Record>
inline void LockedQueue<Record>::Enqueue(const Record& record) {
Node* n = new Node();
CHECK(n != nullptr);
n->value = record;
{
base::LockGuard<base::Mutex> guard(&tail_mutex_);
tail_->next.SetValue(n);
tail_ = n;
}
}
template <typename Record>
inline bool LockedQueue<Record>::Dequeue(Record* record) {
Node* old_head = nullptr;
{
base::LockGuard<base::Mutex> guard(&head_mutex_);
old_head = head_;
Node* const next_node = head_->next.Value();
if (next_node == nullptr) return false;
*record = next_node->value;
head_ = next_node;
}
delete old_head;
return true;
}
template <typename Record>
inline bool LockedQueue<Record>::IsEmpty() const {
base::LockGuard<base::Mutex> guard(&head_mutex_);
return head_->next.Value() == nullptr;
}
template <typename Record>
inline bool LockedQueue<Record>::Peek(Record* record) const {
base::LockGuard<base::Mutex> guard(&head_mutex_);
Node* const next_node = head_->next.Value();
if (next_node == nullptr) return false;
*record = next_node->value;
return true;
}
} // namespace internal
} // namespace v8
#endif // V8_LOCKED_QUEUE_INL_
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