c++ - 对原子操作的最低要求

Question

我只是想收集一些关于原子操作要求的基于证据的信息。

例如(可能不对，举个例子)

1. at x86_64, when you write or read on the entry sizeof long and aligned by long, the operation is aotmic，because balabalabala ...

2. at x86_64, when you write or read bytes use gcc atomic primitive, your operation on these bytes will keep atomic.

希望收到和帮助:)

Answer 1

引自 Professional C++ :

A simple assignment to a simple scalar variable typically requires no synchronization. For example, on the x86, a 32-bit aligned value is handled atomically at the hardware level and a single transaction requires no explicit synchronization. For example, setting a Boolean value to false to stop a thread requires no synchronization, but an operation like ++, -- or op= for any given op requires synchronization.

这并没有回答您所有的问题，但这就是您要寻找的部分内容吗？