v8/src/unbound-queue-inl.h
2014-06-05 12:14:47 +00:00

83 lines
1.9 KiB
C++

// Copyright 2010 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_UNBOUND_QUEUE_INL_H_
#define V8_UNBOUND_QUEUE_INL_H_
#include "src/unbound-queue.h"
namespace v8 {
namespace internal {
template<typename Record>
struct UnboundQueue<Record>::Node: public Malloced {
explicit Node(const Record& value)
: value(value), next(NULL) {
}
Record value;
Node* next;
};
template<typename Record>
UnboundQueue<Record>::UnboundQueue() {
first_ = new Node(Record());
divider_ = last_ = reinterpret_cast<base::AtomicWord>(first_);
}
template<typename Record>
UnboundQueue<Record>::~UnboundQueue() {
while (first_ != NULL) DeleteFirst();
}
template<typename Record>
void UnboundQueue<Record>::DeleteFirst() {
Node* tmp = first_;
first_ = tmp->next;
delete tmp;
}
template<typename Record>
bool UnboundQueue<Record>::Dequeue(Record* rec) {
if (divider_ == base::Acquire_Load(&last_)) return false;
Node* next = reinterpret_cast<Node*>(divider_)->next;
*rec = next->value;
base::Release_Store(&divider_, reinterpret_cast<base::AtomicWord>(next));
return true;
}
template<typename Record>
void UnboundQueue<Record>::Enqueue(const Record& rec) {
Node*& next = reinterpret_cast<Node*>(last_)->next;
next = new Node(rec);
base::Release_Store(&last_, reinterpret_cast<base::AtomicWord>(next));
while (first_ != reinterpret_cast<Node*>(base::Acquire_Load(&divider_))) {
DeleteFirst();
}
}
template<typename Record>
bool UnboundQueue<Record>::IsEmpty() const {
return base::NoBarrier_Load(&divider_) == base::NoBarrier_Load(&last_);
}
template<typename Record>
Record* UnboundQueue<Record>::Peek() const {
if (divider_ == base::Acquire_Load(&last_)) return NULL;
Node* next = reinterpret_cast<Node*>(divider_)->next;
return &next->value;
}
} } // namespace v8::internal
#endif // V8_UNBOUND_QUEUE_INL_H_