memory_order_acq_rel结合了acquire和release的功能。它既保证了读操作的获取顺序（acquire），又保证了写...
y.store(true, std::memory_order_release); } void read_x_then_y() { while (!x.load(std::memory_order_acquire)); if (y.load(std::memory_order_acquire)) { ++z; } } void read_y_then_x() { while (!y.load(std::memory_order_acquire)); if (x.load(std::memory_order_acquire...
复制 #include<atomic>std::atomic_intflag(0);// 初始值为零int data=0;// thread 1voidthread_func1(){data=42;flag.store(1,// 事件1std::memory_order_release);}// thread 2voidthread_func2(){int ready=flag.load(// 事件2std::memory_order_acquire);if(ready==1)printf("%d",data);} ...
0** this wait loop must be a load-acquire such that we match the* store-release that clears ...
限于篇幅,这里只介绍memory_order_acquire(简称Acquire)和memory_order_release(简称Release)这两种内存顺序,后续再介绍C++的其他内存顺序。 下表给出了Acquire和Release的语义: 即,Acquire要求,针对某个读操作,该读操作之后的读操作或写操作,这两种情况下的指令顺序不能改变; Release要求,针对某个写操作,该写操作之前...
memory_order_consume = consume, memory_order_acquire = acquire, memory_order_release = release, memory_order_acq_rel = acq_rel, memory_order_seq_cst = seq_cst }; 所以你可以使用 memory_order::relaxed 代替 memory_order_relaxed,不过因为常量表达式的定义,在 C++ 20 使用 memory_order_relaxed 的...
memory_order_seq_cst,即顺序一致性模型。 Acquire-Release 模式 memory_order_release前面不会被reord到本句之后;memory_order_acquire之后的代码不会被reorder到本句之前;memory_order_acq_rel同时包含acquire和release标志。 这是一段实践代码,代码简单明确:https://www.cnblogs.com/lizhanzhe/p/10893016.html ...
enum memory_order { memory_order_relaxed, memory_order_consume, memory_order_acquire, memory_order_release, memory_order_acq_rel, memory_order_seq_cst }; 1. 2. 3. 4. 5. 6. 7. 8. 这六个值对应的内存访问序列化方式可分为三类内存访问模型,分别是:宽松的访问序列化模型、获取/释放语义模型和...
memory_order_release, memory_order_acq_rel, memory_order_seq_cst }; 上述6 中访存次序(内存序)分为 3 类,顺序一致性模型(std::memory_order_seq_cst),Acquire-Release 模型(std::memory_order_consume, std::memory_order_acquire, std::memory_order_release, std::memory_order_acq_rel,) (获取/释...
在C++的原子操作中,有几种内存顺序选项可以指定,其中包括memory_order_relaxed、memory_order_acquire、memory_order_release、memory_order_acq_rel以及memory_order_seq_cst。 三、单例模式中使用memory_order_acquire 在实现单例模式时,通常会有一个指向单例对象的静态指针,并对其进行检查以确定是否已经创建了单例。