notify / notifyall是否释放正在进行的锁定 [英] Does notify/notifyall release the lock being held

问题描述

我对等待和notify / notifyAll感到困惑。

I am confused a bit about wait and notify/notifyAll.

我知道每个java对象都有一个锁。我知道等待将释放其他线程的锁。通知/ notifyall怎么样？ notify / notifyAll会释放它为其他线程持有的锁吗？

I know there is a lock for every java object. I know wait will release the lock for other thread. How about notify/notifyall? Does notify/notifyAll release the lock it is holding for other thread?

推荐答案

否 - 通知 / notifyAll 不要释放像等那样的锁。唤醒的线程无法运行，直到调用 notify 的代码释放其锁定。

No -- notify/notifyAll don't release locks like wait does. The awakened thread can't run until the code which called notify releases its lock.

这就是Javadoc说：

This is what the Javadoc says:

线程释放此监视器的所有权并等待，直到另一个线程通知通过调用唤醒等待此对象监视器的线程到notify方法或notifyAll方法。然后线程等待，直到它可以重新获得监视器的所有权并继续执行。

The thread releases ownership of this monitor and waits until another thread notifies threads waiting on this object's monitor to wake up either through a call to the notify method or the notifyAll method. The thread then waits until it can re-obtain ownership of the monitor and resumes execution.

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