std::atomic_ref<T>::compare_exchange_weak,std::atomic_ref<T>::compare_exchange_strong boolcompare_exchange_weak (value_type&expected, value_type desired, std::memory_ordersuccess, std::memory_orderfailure)constnoexcept; (1)(constexpr since C++26) ...
cppreference.com 创建账户 页面 讨论 变换 查看 编辑 历史 std::atomic<T>::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)...
泛型函数的名字是宏还是声明有外部链接的标识符是未指定的。若为访问实际函数而压制宏定义(例如像(atomic_compare_exchange)(...)这样加括号),或程序定义了拥有泛型函数名的外部标识符,则行为未定义。 参数 obj-指向要测试及修改的原子对象的指针 expected-指向期待在原子对象中找到的值的指针 ...
compare_exchange_weakis allowed to fail spuriously, that is, acts as if*this!=expectedeven if they are equal. When a compare-and-exchange is in a loop,compare_exchange_weakwill yield better performance on some platforms. Whencompare_exchange_weakwould require a loop andcompare_exchange_strongwo...
https://en.cppreference.com/w/cpp/atomic/atomic/compare_exchangeen.cppreference.com/w/cpp/atomic/atomic/compare_exchange 及: 【公开课】C++11开始的多线程编程(#5)_哔哩哔哩_bilibiliwww.bilibili.com/video/BV1Ya411q7y4 有: main.cpp ...
问不能真正理解std::atomic::compare_exchange_weak和compare_exchange_strong的逻辑EN原子地比较*的对象...
#include <atomic> template<class T> struct node { T data; node* next; node(const T& data) : data(data), next(nullptr) {} }; template<class T> class stack {std::atomic<node<T>*> head; public: void push(const T& data) { node<T>* new_node = new node<T>(data); // 将 ...
std::atomic_compare_exchange_weak, std::atomic_compare_exchange_strong, std::atomic_compare_exchange_weak_explicit, std::atomic_compare_exchange_strong_explicit From cppreference.com < cpp | atom
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...
_Bool atomic_compare_exchange_strong_explicit(volatileA*obj, C*expected, C desired, memory_ordersucc, memory_orderfail); (3)(since C11) _Bool atomic_compare_exchange_weak_explicit(volatileA*obj, C*expected, C desired, memory_ordersucc, ...