锁，互斥，信号量...有什么区别？ [英] Lock, mutex, semaphore... what's the difference?

问题描述

我听说过与并发编程有关的这些词，但它们之间有什么区别？

I've heard these words related to concurrent programming, but what's the difference between them?

推荐答案

一个线程进入被锁定的部分，并且该锁不与任何其他进程共享。

A lock allows only one thread to enter the part that's locked and the lock is not shared with any other processes.

互斥体与锁相同，但它可以是系统级的通过多个进程）。

A mutex is the same as a lock but it can be system wide (shared by multiple processes).

信号量与互斥量相同，但允许x个线程进入。

A semaphore does the same as a mutex but allows x number of threads to enter.

您还有读/写锁，允许在任何给定时间无限数量的读者或1个写者。

You also have read/write locks that allows either unlimited number of readers or 1 writer at any given time.

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