确保按顺序采用Java同步锁？ [英] Ensure Java synchronized locks are taken in order?

问题描述

我们有两个线程通过synchronized方法访问一个列表。我们可以

we have two threads accessing one list via a synchronized method. Can we

a）依靠运行时间来确保每个人都可以根据他们尝试的顺序获得对该方法的访问权或

a) rely on the run time to make sure that each of them will receive access to the method based on the order they tried to or

b）VM是否遵循任何其他规则

b) does the VM follow any other rules

c）是否有更好的方法来序列化请求？

c) is there a better way to serialize the requests?

推荐答案

不，synchronized将以任何顺序提供访问权限（取决于JVM实现）。这甚至可能导致Threads在某些情况下挨饿。

No, synchronized will give access in any order (Depends on the JVM implementation). This could even cause Threads to starve in some scenarios.

您可以使用 ReentrantLock （自Java 5.0开始），带有 fair = true 选项。 （ Lock lock = new ReentrantLock（true）; ）

You can ensure the order by using ReentrantLock (since Java 5.0) with the fair=true option. (Lock lock = new ReentrantLock(true);)

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