1、全栅(full fence):任意两个操作之间使用完整的栅栏std::atomic_thread_fence(),可以避免这些操作的重新排序。不过,对于存储-加载操作来说,它们可能会被重新排序。 2、获取栅栏(acquire fence): std::atomic_thread_fence(std::memory_order_acquire)避免在获取栅栏之前的读操作,被获取栅栏之后的读或写操作重新...
extern "C" void atomic_signal_fence( std::memory_order order ) noexcept; (C++11 起) 在线程和同一线程上执行的信号处理函数之间,建立以 order 指示的非原子和宽松原子访问的内存同步顺序。这等价于 std::atomic_thread_fence ,除了不为内存顺序产生 CPU 指令。只会以 order 指示抑制编译器重排指令。例如...
atomic_signal_fence 在头文件<stdatomic.h>中定义 void atomic_signal_fence(memory_order order); (自C11以来) 按照order在同一线程上执行的线程和信号处理程序之间的指示,建立非原子和宽松原子访问的内存同步排序。这相当于atomic_thread_fence,除了没有发布用于内存排序的CPU指令外。只有编译器对...
inline void atomic_signal_fence( memory_order Order ) _NOEXCEPT; 參數Order 記憶體條件約束,以判斷圍欄類型。備註Order引數會決定圍欄類型。展開資料表 memory_order_relaxed 圍牆有任何作用。 memory_order_consume 圍牆是取得圍欄。 memory_order_acquire 圍牆是取得圍欄。 memory_order_release 圍牆是發行圍欄。
这等价于 std::atomic_thread_fence,除了不为内存定序发出 CPU 指令。只会根据 order 指示抑制编译器的指令重排。例如,拥有释放语义的栅栏阻止把读或写操作移动到后继的写入操作之后,而拥有获得语义的栅栏阻止把读或写操作移动到前驱的读取操作之前。 参数...
inline void atomic_thread_fence( memory_order Order ) _NOEXCEPT; 參數Order 記憶體條件約束,以判斷圍欄類型。備註Order引數會決定圍欄類型。展開表格 memory_order_relaxed 圍牆有任何作用。 memory_order_consume 圍牆是取得圍欄。 memory_order_acquire 圍牆是取得圍欄。 memory_order_release 圍牆是發行圍欄。
atomic_signal_fence extern "C" void atomic_signal_fence (memory_order sync) noexcept; Signal fenceEstablishes a single-thread fence: The point of call to this function becomes either an acquire or a release ordering point (or both) within a single thread. This function is equivalent to ...
void atomic_signal_fence(memory_order order); Parameters order The memory order that is executed by this fence. Usage This function is equivalent to atomic_thread_fence, except that the resulting order constraints are established only between a thread and a signal handler that is executed in th...
void thread2() { //等待readyFlag变为true { std::unique_lock<std::mutex> ul(readyFlagMutex); //如果readyFlag仍未false,说明thread1还没有锁定,那么持续等待 while (!readyFlag) { ul.unlock(); std::this_thread::yield(); std:this_thread::sleep_for(std::chrono::milliseconds(100)); ...
atomic_thread_fence atomic_signal_fence 原子对象的函数(C风格) 函数 atomic_is_lock_free atomic_init atomic_store atomic_store_explicit atomic_load atomic_load_explicit atomic_exchange atomic_exchange_explicit atomic_compare_exchange_weak atomic_compare_exchange_weak_explicit atomic_compare_exchange_strong...