Java停放线程

Question

Java 中的停放线程和等待线程有什么区别？我有一个 jboss 核心转储，分析它显示有很多停放的线程。

Answer 1

看Javadoc park() 方法:

Disables the current thread for thread scheduling purposes unless the permit is available. If the permit is available then it is consumed and the call returns immediately; otherwise the current thread becomes disabled for thread scheduling purposes and lies dormant until one of three things happens:

Some other thread invokes unpark with the current thread as the target; or Some other thread interrupts the current thread; or The call spuriously (that is, for no reason) returns. This method does not report which of these caused the method to return. Callers should re-check the conditions which caused the thread to park in the first place. Callers may also determine, for example, the interrupt status of the thread upon return.

因此，停放线程是使用 LockSupport.park() 阻塞的线程。