请教一个多线程问题，哪一种synchronization primitive只应许一个thread在critical section里？ - 未名空间MITBBS历史存档

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请教一个多线程问题，哪一种synchronization primitive只应许一个thread在critical section里？

请教一个多线程问题，哪一种synchronization primitive只应许一个thread在critical section里？# JobHunting - 待字闺中

c*z2014-11-12 08:11

1 楼

In a multithreaded environment, what are two types of methods to protect
memory from being written over
by two threads at the same time?
mutex，还有什么？

l*42014-11-12 08:11

2 楼

barrier?

【在 c**z 的大作中提到】

: In a multithreaded environment, what are two types of methods to protect
: memory from being written over
: by two threads at the same time?
: mutex，还有什么？

e*m2014-11-12 08:11

3 楼

barrier和volatile?
mutex不是particularly for this issue

【在 c**z 的大作中提到】

: In a multithreaded environment, what are two types of methods to protect
: memory from being written over
: by two threads at the same time?
: mutex，还有什么？

z*g2014-11-12 08:11

4 楼

barrier和volatile显然不是
barrier是用来prevent memory reordering的，而volatile只是强制compiler生成读取
memory的code。这俩可以说是primitive中的primitive
正确的应该是mutex和atomic operations（fetch-and-xxx，compare-and-swap）

【在 e***m 的大作中提到】

: barrier和volatile?
: mutex不是particularly for this issue