c++ 无锁数据结构示例
时间: 2024-07-08 20:01:30 浏览: 67
在C++中,无锁数据结构通常用于编写高性能并发程序,避免了传统互斥锁带来的性能开销和死锁风险。这里我们以单链表为例,展示一个简单的无锁(无互斥锁)双向链表节点的实现:
```cpp
template <typename T>
struct UnlockedListNode {
T value;
UnlockedListNode* prev;
UnlockedListNode* next;
// 构造函数等其他方法
};
// 插入操作,无需加锁
template <typename T>
void insert(UnlockedListNode<T>& head, const T& value) {
UnlockedListNode<T>* newNode = new UnlockedListNode<T>{value, nullptr, head};
if (head.prev != nullptr) {
head.prev->next = newNode;
} else {
assert(head.next == nullptr);
head = newNode;
}
newNode->prev = head.prev;
}
// 删除操作,同样不加锁
template <typename T>
bool remove(UnlockedListNode<T>& head, const T& value) {
UnlockedListNode<T>* curr = head;
while (curr != nullptr && curr->value != value) {
curr = curr->next;
}
if (curr == nullptr) return false; // 值未找到
if (curr->prev != nullptr) {
curr->prev->next = curr->next;
} else {
assert(head == curr);
head = curr->next;
}
if (curr->next != nullptr) {
curr->next->prev = curr->prev;
}
delete curr;
return true;
}
//
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