Thread.join() 和同步? [英] Thread.join() and synchronization?

问题描述

当线程被加入时，Thread.join() 是否与缓存刷新等完全同步?

Is Thread.join() a full synchronization with flushing of caches etc. when performed of the thread beeing joined?

推荐答案

我认为你在问是否从线程 T1 调用 T2 上的 join，T1 中的代码读取 之后的数据join() 肯定会看到 T2 编写的更改.如果是这样，那么答案是肯定的，因为 JLS 17.4.4:

I think you're asking whether from thread T1 that calls join on T2, code in T1 reading data after the join() will definitely see changes written by T2. If that's the case, then the answer is yes, due to JLS 17.4.4:

线程 T1 中的最终操作与另一个线程 T2 中检测到 T1 已终止的任何操作同步.

The final action in a thread T1 synchronizes-with any action in another thread T2 that detects that T1 has terminated.

T2 可以通过调用 T1.isAlive() 或 T1.join() 来实现这一点.

和 JLS 17.4.5:

线程中的所有操作发生在之前任何其他线程从该线程上的join()成功返回.

All actions in a thread happen-before any other thread successfully returns from a join() on that thread.

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