为什么在catch InterruptException块中调用Thread.currentThread.interrupt（）？ [英] Why invoke Thread.currentThread.interrupt() in a catch InterruptException block?

问题描述

为什么在catch块中调用Thread.currentThread.interrupt（）方法？

Why invoke the method Thread.currentThread.interrupt() in the catch block?

推荐答案

这是对保持状态。

当你捕获 InterruptException 并吞下它时，你基本上阻止任何更高级别方法/线程组注意到中断。这可能会导致问题。

When you catch the InterruptException and swallow it, you essentially prevent any higher level methods/thread groups from noticing the interrupt. Which may cause problems.

通过调用 Thread.currentThread（）。interrupt（），设置中断标志的线程，所以更高级别的中断处理程序会注意到它并可以适当地处理它。

By calling Thread.currentThread().interrupt(), you set the interrupt flag of the thread, so higher level interrupt handlers will notice it and can handle it appropriately.

Java Concurrency in Practice 在第7.1.3节：响应中断中更详细地讨论了这一点。它的规则是：

Java Concurrency in Practice discusses this in more detail in Chapter 7.1.3: Responding to Interruption. Its rule is:

只有实现线程中断策略的代码才可以吞下中断请求。通用任务和库代码永远不应该吞下中断请求。

Only code that implements a thread's interruption policy may swallow an interruption request. General-purpose task and library code should never swallow interruption requests.

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