std::atomic::compare_exchange_weak的原子性head.compare_exchange_weak(ptr,head.load()->next));?我相信应该是这样,但在输出中似乎又不是这样(在下面的代码示例之后)。或者,这个问题有意义吗?另一个问题:**new_node->next = head.exchange(new_node);**是原子操作吗?我的意思是,std::atomic::exchange...
bool compare_exchange_weak( T& expected, T desired, std::memory_order order = std::memory_order_seq_cst ) noexcept; (3) (C++11 起) bool compare_exchange_weak( T& expected, T desired, std::memory_order order = std::memory_order_seq_cst ) volatile noexcept; (4) (C++11 起) ...
下面是变通方法: // node<T>* old_head = head.load(std::memory_order_relaxed); // do { // new_node->next = old_head; // } while(!head.compare_exchange_weak(old_head, new_node, // std::memory_order_release, // std::memory_order_relaxed)); } }; int main() { stack<int>...
通常都会想到加锁，加锁可以保护共享的数据，不过也会存在一些问题： 1. 由于临界区无法并发运行，进...
std::atomic_compare_exchange_weak_explicit(&head,&new_node->next, new_node,std::memory_order_release,std::memory_order_relaxed));// 循环体为空// 注意:上述循环非线程安全,至少在// 早于 4.8.3 的 GCC ( bug 60272 ),早于 2014-05-05 的 clang ( bug 18899)// 早于 2014-03-17 的 ...
bool compare_exchange_weak ( value_type& expected, value_type desired, std::memory_order order = std::memory_order_seq_cst ) const noexcept; (2) (constexpr since C++26) bool compare_exchange_strong ( value_type& expected, value_type desired, std::memory_order success, std::memory_order...
我将给出一个例子，因为它非常简单，所以我确实使用了它。
std::atomic boolcompare_exchange_weak(T&expected, T desired, std::memory_ordersuccess, std::memory_orderfailure)noexcept; (1)(since C++11) boolcompare_exchange_weak(T&expected, T desired, std::memory_ordersuccess, std::memory_orderfailure)volatilenoexcept; ...
std::atomic_compare_exchange_weak_explicit( &head, &new_node->next, new_node,std::memory_order_release,std::memory_order_relaxed)) ; // 循环体为空 // 注意:上述循环非线程安全,至少在 // 早于 4.8.3 的 GCC ( bug 60272 ),早于 2014-05-05 的 clang ( bug 18899) // 早于 2014-03...
boolatomic_compare_exchange_weak (std::atomic<T>*obj,typenamestd::atomic<T>::value_type*expected, typenamestd::atomic<T>::value_typedesired)noexcept; (1)(C++11 起) template<classT> boolatomic_compare_exchange_weak (volatilestd::atomic<T>*obj, ...