Java JVM概要分析，线程状态 - “监视”是什么地位意味着什 [英] Java JVM profiling, thread status - what does "Monitor" status mean?

问题描述

我使用visualVM连接多线程Java应用程序，线程有4个状态，即运行，休眠，等待，监视。这种监控状态意味着什么？ wait和Monitor之间有什么区别？

I use visualVM connect a multi thread Java application, thread has 4 status, namely running, sleeping, wait, Monitor. What does this Monitoring status mean? What's the difference between wait and Monitor?

推荐答案

这些状态与 Thread.State 枚举。 等待意味着，正如文档所说：

These states are the same as mentioned in the Thread.State enum. "Wait" means, as the documentation says:

由于调用以下方法之一，线程处于等待状态：

A thread is in the waiting state due to calling one of the following methods:

• 没有超时的Object.wait


• 没有超时的Thread.join


• LockSupport.park

监视器是已被阻止 state，其中线程正在等待获取对象的锁定（因为它正在尝试输入 synchronized 块或方法，而另一个线程已经持有相关的锁。）

"Monitor" is the BLOCKED state, in which the thread is waiting to obtain a lock on an object (because it's trying to enter a synchronized block or method while another thread already holds the associated lock).

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