如何知道信号量是否会阻塞我的进程 [英] How to know if a semaphore is going to block my process

问题描述

我正在用Java在大学里做一份工作，我需要知道是否有某种方法可以知道信号量是否会阻止带有aquire的进程.

I'm making in java a work for my college , and i need to know if there are some way for knowing if a semaphore will block a process with an aquire .

推荐答案

是的，如果您使用的是 java.util.concurrent.Semaphore :

Yes, if you are using java.util.concurrent.Semaphore:

boolean tryAcquire()

boolean tryAcquire()

仅在以下情况下从此信号量获取许可调用时可以使用一个.

Acquires a permit from this semaphore, only if one is available at the time of invocation.

boolean acquired = semaphore.tryAcquire();
if (acquired) {
    System.out.println("Got it!");
    semaphore.release();
} else {
    System.out.println("Returned immediately, would have blocked");
}

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