C ++ int操作在mips架构上是原子的 [英] Are C++ int operations atomic on the mips architecture

问题描述

我想知道我是否可以读取或写入共享int值，而不锁定在mips cpu（尤其是亚马逊或多瑙河）。我的意思是如果这样的读或写是原子的（其他线程不能中断他们）。要清楚 - 我不想阻止线程之间的竞争，但我关心int值本身没有损坏。

I wonder if I could read or write shared int value without locking on mips cpu (especially Amazon or Danube). What I mean is if such a read or write are atomic (other thread can't interrupt them). To be clear - I don't want to prevent the race between threads, but I care if int value itself is not corrupted.

假设编译器将所有ints cpu字的边界，应该是可能的。我使用gcc（g ++）。测试也显示它似乎工作正常。

Assuming that the compiler aligns all ints at the boundaries of cpu word, it should be possible. I use gcc (g++). Tests also shows that it seems work correctly. But maybe someone knows it for sure?

推荐答案

使用gcc的内置原子操作，如果不支持这些操作， ：
http：//gcc.gnu。 org / onlinedocs / gcc-4.1.2 / gcc / Atomic-Builtins.html

Use gcc's builtin atomic operations and you'll get warnings if they're not supported: http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Atomic-Builtins.html

看起来像加法/减法和测试的组合可能在硬件上：
http：/ /rswiki.csie.org/lxr/http/source/include/asm-mips/atomic.h

It looks like combinations of addition/subtraction and testing (at least) are possible on the hardware: http://rswiki.csie.org/lxr/http/source/include/asm-mips/atomic.h

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