std::memory_order_consume仅仅只用来补充该系列的完整性,在实际代码中不能使用该内存序,且在GCC中会自动将该内存序转换为std::memory_order_acquire。参考至 Fixing GCC's Implementation of memory_order_consumepreshing.com/20141124/fixing-gccs-implementation-of-memory_order_consume/ 1 data dependency介绍...
memory_order_acq_rel实际上是memory_order_release和memory_order_acquire的结合版本,主要用在既读值又取值的原子方法,保证了如果读到的是memory_order_release的存储,那么之前存储前面的指令可见;并且下一次使用memory_order_acquire的读时,本条指令前的指令可见。 memory_order_consume和memory_order_release对 memory...
std::atomic<int*> ptr(nullptr);int data;ptr.store(&data, std::memory_order_release);int* res = ptr.load(std::memory_order_consume);if (res != nullptr) {// 这里的操作不能被重排到 load 操作之前do_something(*res);} 2.3 std::memory_order_acquire (获取顺序) std::memory_order_acquir...
memory_order_relaxed:没有同步或顺序制约,仅对此操作要求原子性 memory_order_consume:在当前线程中,load操作之后的依赖于此原子变量的读和写操作都不能被重排到当前指令前。如果有其他线程使用memory_order_release内存模型对此原子变量进行store操作,在当前线程中是可见的。 memory_order_acq_rel:等同于对原子变量同...
std::memory_order_relaxed(松散顺序):不对执行顺序做出任何保证。 std::memory_order_consume(消费顺序):一个载入操作的后续操作(仅限于依赖于该载入操作的结果的操作)不能被重排到该载入操作之前。 std::memory_order_acquire(获取顺序):一个载入操作的后续操作(包括对任何变量的读取和写入)不能被重排到该载入...
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...
std::memory_order 定义于头文件<atomic> typedefenummemory_order{ memory_order_relaxed, memory_order_consume, memory_order_acquire, memory_order_release, memory_order_acq_rel, memory_order_seq_cst }memory_order; (C++11 起) (C++20 前)
std::memory_order 定义于头文件<atomic> typedefenummemory_order{ memory_order_relaxed, memory_order_consume, memory_order_acquire, memory_order_release, memory_order_acq_rel, memory_order_seq_cst }memory_order; (C++11 起) (C++20 前)
std::memory_order Defined in header<atomic> enummemory_order { memory_order_relaxed, memory_order_consume, memory_order_acquire, memory_order_release, memory_order_acq_rel, memory_order_seq_cst }; (since C++11) (until C++20) enumclassmemory_order:/* unspecified */ ...
memory_order_consume 是C++原子操作中的一个内存顺序选项,用于定义原子操作的内存可见性。然而,由于其在不同处理器架构上的实现复杂性和潜在的错误使用,C++17已将其标记为暂时弃用,并建议开发者使用更严格的内存顺序选项,如 memory_order_acquire。 shared_ptr::unique的弃用 ...