Java Thread getId() 线程安全吗? [英] Is Java Thread getId() thread-safe?

问题描述

正如问题标题所说，Thread.getId() 线程安全吗?我最近在处理多线程时遇到了一个问题，解决方案是删除 getId() 调用，因为它使线程挂起.

As the question title says, is Thread.getId() thread-safe? I recently had a problem whilst multithreading and the solution was to remove the getId() call as it was making the thread hang.

推荐答案

是的，它是完全线程安全的.JDK8 中的完整实现是:

Yes, it's entirely thread-safe. The full implementation in JDK8 is:

public long getId() {
    return tid;
}

tid 在 Thread 对象的构造过程中被初始化一次，之后就不会改变.

tid is initialized once during construction of the Thread object and never changed afterward.

如果您的代码中有问题解决了删除它的问题，那是您在拥有 ID 后对 ID 所做的，而不是获取 ID.

If there was a problem in your code that removing it solved, it was what you were doing with the ID once you had it, not getting the ID.

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