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std::atomic_flag:: test_and_set

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std::atomic_flag
定义于头文件 <atomic>
bool test_and_set ( std:: memory_order order =
std:: memory_order_seq_cst ) volatile noexcept ;
(1) (C++11 起)
bool test_and_set ( std:: memory_order order =
std:: memory_order_seq_cst ) noexcept ;
(2) (C++11 起)

以原子方式将 std::atomic_flag 的状态更改为置位状态（ true ），并返回其先前持有的值。

参数

order - 内存同步顺序

参见

原子地将标志设置为 false
(公开成员函数)
(C++11) (C++11)
原子地将标志设置为 true 并返回其先前值
(函数)
(C++11)
为给定的原子操作定义内存排序约束
(枚举)