Java 并发编程之 AQS ReentrantLock 可中断锁源码解析
Java juc AQS About 1,338 words部分源码
java.util.concurrent.locks.ReentrantLock#lockInterruptibly
public void lockInterruptibly() throws InterruptedException {
sync.acquireInterruptibly(1);
}
java.util.concurrent.locks.AbstractQueuedSynchronizer
public final void acquireInterruptibly(int arg)
throws InterruptedException {
if (Thread.interrupted())
throw new InterruptedException();
if (!tryAcquire(arg))
doAcquireInterruptibly(arg);
}
private void doAcquireInterruptibly(int arg)
throws InterruptedException {
final Node node = addWaiter(Node.EXCLUSIVE);
try {
for (;;) {
final Node p = node.predecessor();
if (p == head && tryAcquire(arg)) {
setHead(node);
p.next = null; // help GC
return;
}
if (shouldParkAfterFailedAcquire(p, node) &&
parkAndCheckInterrupt())
throw new InterruptedException();
}
} catch (Throwable t) {
cancelAcquire(node);
throw t;
}
}
private final boolean parkAndCheckInterrupt() {
LockSupport.park(this);
return Thread.interrupted();
}
可中断锁如果一开始tryAcquire
抢得锁了就继续执行锁内的代码。
如果没有抢得锁,在LockSupport.park()
处停止,当线程被调用了interrupte()
方法后,LockSupport.park()
恢复执行。并且抛出了异常。
抛出异常后又在catch
中捕获了Throwable
异常,处理取消节点的逻辑,最后再抛出去。
Views: 1,448 · Posted: 2021-10-05
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