Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you about how to write CountDownLatch based on AQS. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

Import java.util.concurrent.TimeUnit;import java.util.concurrent.locks.AbstractQueuedSynchronizer;/** * Created by yzy on 2018-10-31. * / public class MyCountDownLatch {/ * * Synchronization control For CountDownLatch. * Uses AQS state to represent count. * / private static final class Sync extends AbstractQueuedSynchronizer {private static final long serialVersionUID = 498226498192 2014374L; Sync (int count) {setState (count);} int getCount () {return getState ();} @ Override protected int tryAcquireShared (int acquires) {return (getState () = = 0)? 1:-1 } @ Override protected boolean tryReleaseShared (int releases) {/ / Decrement count; signal when transition to zero for (;;) {int c = getState (); if (c = = 0) return false; int nextc = Cmur1 If (compareAndSetState (c, nextc)) return nextc = = 0;} private final Sync sync; public MyCountDownLatch (int count) {if (count < 0) throw new IllegalArgumentException ("count < 0"); this.sync = new Sync (count);} public void await () throws InterruptedException {sync.acquireSharedInterruptibly (1) } public boolean await (long timeout, TimeUnit unit) throws InterruptedException {return sync.tryAcquireSharedNanos (1, unit.toNanos (timeout));} public void countDown () {sync.releaseShared (1);} public long getCount () {return sync.getCount ();} public String toString () {return super.toString () + "[Count =" + sync.getCount () + "]" }} this is how the editor shared how to write CountDownLatch based on AQS. If you happen to have similar doubts, please refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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