我如何衡量有多少线程正在执行一段代码? [英] How can I measure how many threads are executing a piece of code?

问题描述

我正在尝试测量有多少线程正在同时执行一段代码. 目前，我正在使用信号量，是否有更好的方法?

I am trying to measure how many threads are executing a section of code at the same time. Currently i am (ab)using Semaphores for this, is there a better way?

final int MAX_THREADS = Integer.MAX_VALUE;

Semaphore s = new Semaphore(MAX_THREADS);

s.acquire(); // start of section

// do some computations

// track how many threads are running the section
trackThreads( (MAX_THREADS - s.availablePermits()) );         

s.release(); // end of section

推荐答案

使用类似于:

AtomicInteger count = new AtomicInteger();

count.getAndIncrement();

// do some computations

// track how many threads are running the section
trackThreads( count.get() );         

count.getAndDecrement(); // end of section

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