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...
atomic_compare_exchange_strong_explicit 文章/答案/技术大牛搜索 搜索关闭 发布 搜索 Bootstrap 4 Bootstrap 3 C 算法| Algorithms 原子操作 | Atomic operations Atomic operations library ATOMIC_*_LOCK_FREE atomic_compare_exchange_strong atomic_compare_exchange_strong_explicit...
_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...
与atomic_compare_exchange_strong 不同,weak版本的 compare-and-exchange 操作允许(spuriously 地)返回 false(即原子对象所封装的值与参数expected的物理内容相同,但却仍然返回 false),不过在某些需要循环操作的算法下这是可以接受的,并且在一些平台下 compare_exchange_weak 的性能更好 。如果 atomic_compare_exchange_...
staticinlineAtomicWordAtomicExchangeExplicit(volatileAtomicWord*p,AtomicWord val){return(AtomicWord)_InterlockedExchange64((volatileLONGLONG*)p,(LONGLONG)val);}staticinlineboolAtomicCompareExchangeStrongExplicit(volatileAtomicWord*p,AtomicWord*oldval,AtomicWord newval){return_InterlockedCompareExchange64((volatile...
compare_exchange_weak compare_exchange_strong 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, ...
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); (...
A.connect B.compareC.substitute D.exchange解析:选 C 作者打算用AND来代替它(指BUT)。substitute“(用……)代替,取代”,符合语境。connect“连接”;compare“对比,比较”;exchange“交换;交流”。Ⅱ.任务型阅读(2019·南通、泰州模拟)Climate change has had a big impact on the timing of river floods acros...
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在block 外定义一个 __weak的 引用到 self,并在在 block 内部通过这个弱引用定义一个 __strong 的引用。 方案1. 直接在 block 里面使用关键词 self 如果我们直接在 block 里面用 self 关键字,对象会在 block 的定义时候被 retain,(实际上 block 是 copied 但是为了简单我们可以忽略这个)。一个 const 的对...