2.6、compare_exchange_weak函数 2.7、compare_exchange_strong函数 2.8、专业化支持的操作 三、使用示例 总结 一、简介 C++中原子变量(atomic)是一种多线程编程中常用的同步机制,它能够确保对共享变量的操作在执行时不会被其他线程的操作干扰,从而避免竞态条件(race condition)和死锁(deadlock)等问题。 原子变量可以看...
1. 函数原型: bool __atomic_compare_exchange_n(type *ptr,type*expected,typedesired, bool weak, int success_memorder, int failure_memorder) 函数说明: his built-in function implements an atomic compare and exchange operation. This compares the contents of*ptrwith the contents of*expected. If e...
compare_exchange_strong也就是上文提到的Compare And Swap,会将shared的值和函数内读到的oldValue进行比较,如果相同(表示没有被其他正在运行的线程所更改)则将shared的值修改为oldValue * mult(乘的结果),然后返回true;但是如果不同,也就是被其他线程把数据改了,则该值更新oldValue,函数返回false,继续执行wh...
boolcompare_exchange_weak( T& expected, T desired, std::memory_order success, std::memory_order failure )noexcept;boolcompare_exchange_weak( T& expected, T desired, std::memory_order success, std::memory_order failure )volatilenoexcept;//(2) (C++11 起)boolcompare_exchange_weak( T& expecte...
atomic_compare_exchange_weak_explicit (Atomic operations) - C 中文开发手册 在头文件<stdatomic.h>中定义 _Bool atomic_compare_exchange_strong(volatile A * obj,C * expected,C desired); (1) (自C11以来) _Bool atomic_compare_exchange_weak(volatile A * obj,C * expected,C desired); (...
C11标准(ISO/IEC 9899:2011): 7.17.7.4 atomic_compare_exchange通用函数(p: 283-284) 另请参阅 atomic_exchangeatomic_exchange_explicit(C11)用原子对象(函数)的值交换一个值 | C ++文档:atomic_compare_exchange_weak,atomic_compare_exchange_strong,atomic_compare_exchange_weak_explicit,atomic_compare_exchang...
_Bool atomic_compare_exchange_weak( volatile A *obj, C* expected, C desired ); (2) (C11 起) _Bool atomic_compare_exchange_strong_explicit( volatile A* obj, C* expected, C desired, memory_order succ, memory_order fail ); (3) (C11 起) _Bool atomic_compare_exchange_weak_expl...
compare [kəmˈpeə(r)] vt. 比较, 对照 compass [ˈkʌmpəs] n. 罗盘, 指南针 compensate [ˈkɔmpenseɪt] v. 补偿, 弥补 compete [kəmˈpiːt] vi. 比赛, 竞赛 competence [ˈkɔmpətəns] n.能力,胜任...
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