Java多线程系列（六）wait，notify 与notifyall

perfectnihil

于 2019-05-10 17:32:35 发布

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本文深入探讨了Java中线程同步的三大核心方法：wait、notify和notifyAll。wait方法使当前线程进入等待状态，直到被notify或notifyAll唤醒。notify方法随机唤醒一个处于等待状态的线程，而notifyAll则唤醒所有等待的线程，使它们有机会重新竞争对象锁。

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1.wait方法

根据注释：

it places the current thread
* into the wait set for this object

进入wait set

2.notify方法

Wakes up a single thread that is waiting on this object's
* monitor. If any threads are waiting on this object, one of them
* is chosen to be awakened. The choice is arbitrary and occurs at
* the discretion of the implementation. A thread waits on an object's
* monitor by calling one of the {@code wait} methods.

从wait set中取出一个线程，可以重新竞争锁

3.notifyall方法

唤醒所有wait set中的线程

wakes up all threads that are waiting on this object's monitor