Java：等待同步块，谁先走？ [英] Java: waiting on synchronized block, who goes first?

问题描述

此问题的灵感来自此其他问题。

如果多个线程在 synchronized 块上等待，并且锁定变为可用，谁先行？是通过线程优先级（先到先服务）吗？

If multiple threads are waiting on a synchronized block, and the lock becomes available, who goes first? Is it by thread priority (and then first-come-first-served)?

并且相同的规则适用于通知（多个等待线程）？

And do the same rules apply for notify (with multiple waiting threads)?

推荐答案

根据对这个家伙： http://tutorials.jenkov.com/java-concurrency /starvation-and-fairness.html

Java不对序列发出任何保证。所以我猜它不是基于线程优先级

Java issues no guarantees about the sequence. So I guess it is not based on thread priority

我将尝试进一步了解Java如何确定谁先行。

I'll try to look further for an explanation on how Java actually decides who goes first.

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