CountDownLatch解读
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CountDownLatch类的内部有一个同步器的对象,他也是基于AQS来实现了,同步器代码如下:
private static final class Sync extends AbstractQueuedSynchronizer {
private static final long serialVersionUID = 4982264981922014374L;
Sync(int count) {
setState(count);
}
int getCount() {
return getState();
}
protected int tryAcquireShared(int acquires) {
return (getState() == 0) ? 1 : -1;
}
protected boolean tryReleaseShared(int releases) {
// Decrement count; signal when transition to zero
for (;;) {
int c = getState();
if (c == 0)
return false;
int nextc = c-1;
if (compareAndSetState(c, nextc))
return nextc == 0;
}
}
}
我们通过语句创建CountDownLatch时一般用如下的代码
CountDownLatch countDown = new CountDownLatch(10);
这个10的值就对应了设置到了AQS的state的属性只里面,每当我们调用
countDown.countDown();时就会使用cas去将state的值减一,countDown方法的代码如下:
public void countDown() {
sync.releaseShared(1);
}
他就是调用了自身同步器类的releaseShared()方法,传入参数为1.
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