inline constexpr memory_order memory_order_consume = memory_order::consume; inline constexpr memory_order memory_order_acquire = memory_order::acquire; inline constexpr memory_order memory_order_release = memory_order::release; inline constexpr memory_order memory_order_acq_rel = memory_order::a...
现代编译器对memory_order_consume的支持也不完善，很多时候consume实际上被视作acquire。所以，建议在实际...
C++ memory order循序渐进(二)-- C++ memory order基本定义和形式化描述所需术语关系详解目录 1 c++的六种memory_order 1.1 memory_order_relaxed 1.2 memory_order_consume 1.3 memory_order_acquire 1.4 memor…
memory_order_acquire:All writes in other threads that release the same atomic variable are visible in the current thread 初步理解为memory_order_consume会比memory_order_acquire少一些强制依赖关系,或者理解为memory_order_acquire的效果是释放操作后有内存栅设置。 gcc的解释更清晰一些: __ATOMIC_RELAXED No ...
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/释放语义模型和顺序一致性模型。按照...
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 ...
memory_order_release/acquire/consume 提供release、acquire或者consume, release语意的一致性保障 memory_...
memory_order_consume 程序可以说明哪些变量有依赖关系,从而只需要同步这些变量的内存。 类似于memory_order_acquire,但是只对有依赖关系的内存。意思是别的CPU执行了memory_order_release操作,而其他依赖于这个atomic变量的内存会被执行memory_order_consume的CPU看到。这个操作是C++特有的,x86也不支持这种类型的memory ord...
顺序一致次序（memory_order_seq_cst）默认使用，意味着程序行为被视为简单序列。松弛次序（memory_order_relaxed）允许内存操作重排，但需保证同一线程内对同一变量的操作顺序。获取-释放次序（memory_order_release(memory_order_acquire)）提供同步方法，限制不同线程间的操作顺序。memory_order_consume则引入...
enum memory_order {memory_order_relaxed,memory_order_consume,memory_order_acquire,memory_order_release,memory_order_acq_rel,memory_order_seq_cst}; memory_order指定如何在原子操作周围定期进行非原子内存访问。在多核系统上不存在任何约束时,当多个线程同时读取和写入多个变量时,一个线程可以按照与另一个线程...