有没有办法等待原子整数的变化 [英] Is there a way to wait for the change on an atomic integer

问题描述

有没有办法等待AtomicInteger，这样我就不必一直休眠当前线程并像这样继续检查AtomicInteger

Is there a way to wait on an AtomicInteger so that I don't have to keep sleeping my current thread and keep checking on the AtomicInteger like this

while(atomicInt.get() >= 0) {
    Thread.sleep(1000)
}

我知道有一个CountDownLatch之类的东西，但这只允许我递减，我还需要它能够递增

I know there is such a thing as a CountDownLatch but that only allows me to decrement I also need it to be able to increment

进一步的故事- 我有一个创建线程的循环，我需要等待其中一个线程执行完成才能创建新线程.但是，我正在使用Executors.newFixedThreadPool(numThreads)，等待它的唯一方法似乎是调用shutdown方法await终止，然后创建一个新的threadPool，所以我改用原子整数来跟踪正在运行的线程数和/或排队，以便当该数量减少时，我可以继续循环.

Further BackStory - I have a loop creating threads and I need to wait on one of the threads execution to finish before creating a new thread. I however am using an Executors.newFixedThreadPool(numThreads) and the only way to wait on it seems to be to call the shutdown method await termination and then create a new threadPool so instead I was using an atomic integer to keep track of how many threads were running and/or on the queue so that when that number decreased I could continue with the loop.

推荐答案

AtomicInteger并不意味着您将如何使用它.

Semaphore looks like it might be closer to what you're looking for, actually -- it lets you wait until one or more "permits" is available. AtomicInteger isn't meant to be used how you're using it.

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