在信号量的上下文中 P 和 V 操作的原始含义是什么? [英] What is the original meaning of P and V operations in a context of a semaphore?

问题描述

有谁知道为什么信号量操作被称为P和V?每次我读一章关于信号量的内容时，它都会说如下:

Does anybody know why semaphore operations are called P and V? Every time I read a chapter on semaphores it says something like the following:

为了让线程获得资源，它执行了一个 P 操作.并且为了让线程释放资源，它执行了一个 V 操作.

In order for the thread to obtain a resource it executes a P operation. And in order for the thread to release a resource it executes a V operation.

P 和 V 代表什么?为什么它们不被称为等待和信号?

What does P and V stand for? Why they are not called wait and signal?

推荐答案

Dijkstra，信号量的发明者之一，使用了 P 和 V.这些字母来自荷兰语单词 Probeer(尝试)和 Verhoog(增量).

Dijkstra, one of the inventors of semaphores, used P and V. The letters come from the Dutch words Probeer (try) and Verhoog (increment).

另见:https://cs.nyu.edu/~yap/classes/os/resources/origin_of_PV.html

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