多个线程可以同时等待一个信号量 [英] Multiple threads can wait on a semaphore at same time

问题描述

多个线程可以等待一个信号量吗?如果是，在信号量下降时将恢复哪一个?

Can multiple threads wait on a single semaphore ? If yes, upon semaphore down which one will be resumed ?

推荐答案

Can multiple threads wait on a single semaphore ?

是的.

If yes, upon semaphore down which one will be resumed ?

正是其中之一.哪一个取决于操作系统内核实现:用于保存等待线程的容器类型.这很可能是一个 FIFO 队列，因此第一个调用 semaphore.wait() 的线程将首先被释放，但您不应该以依赖此行为的任何方式设计您的应用.

Exactly one of them. Which one depends on OS kernel implementation: the container type that is used to hold the waiting threads. This is quite likely to be a FIFO queue and so the first thread to call semaphore.wait() will be released first, but you should not design your app in any way that relies on this behaviour.

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