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 ...
template< class T > bool atomic_compare_exchange_weak_explicit( std::atomic<T>* obj, T* expected, T desired, std::memory_order succ, std::memory_order fail ); template< class T > bool atomic_compare_exchange_weak_explicit( volatile std::atomic<T>* obj, T* expected, T desired...
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...
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...
template< class T > bool atomic_compare_exchange_weak_explicit( std::atomic<T>* obj, T* expected, T desired, std::memory_order succ, std::memory_order fail ); template< class T > bool atomic_compare_exchange_weak_explicit( volatile std::atomic<T>* obj, T* expected, T desired...
boolatomic_compare_exchange_weak (volatilestd::atomic<T>*obj, typenamestd::atomic<T>::value_type*expected, typenamestd::atomic<T>::value_typedesired)noexcept; (2)(C++11 起) template<classT> boolatomic_compare_exchange_strong (std::atomic<T>*obj,typenamestd::atomic<T>::value_type*expected...
compare_exchange_weak, std::atomic<T>::compare_exchange_strong C++ 并发支持库 std::atomic bool compare_exchange_weak( T& expected, T desired, std::memory_order success, std::memory_order failure ) noexcept; (1) (C++11 起) bool compare_exchange_weak( T& expected, T desired, std::...
head.compare_exchange_weak(old_head, new_node, // std::memory_order_release, // std::memory_order_relaxed)); } }; int main() { stack<int> s; s.push(1); s.push(2); s.push(3); }演示compare_exchange_strong 如何要么更改原子对象的值,要么将变量用于比较。
boolatomic_compare_exchange_weak_explicit (volatilestd::atomic<T>*obj, typenamestd::atomic<T>::value_type*expected, typenamestd::atomic<T>::value_typedesired, std::memory_ordersuccess,std::memory_orderfailure)noexcept; (6)(since C++11) ...
注意,compare_exchange_weak函数是一个弱化版本的原子操作函数,因为在某些平台上它可能会失败并重试。如果需要保证严格的原子性,则应该使用compare_exchange_strong函数。 示例: #include <iostream> // std::cout #include <atomic> // std::atomic #include <thread> // std::thread #include <vector> // st...