parkAndCheckInterrupt是怎么来阻塞当前线程的，代码如下：
代码语言：javascript复制private static boolean shouldParkAfterFailedAcquire(Node pred, Node node) {
//前驱节点的状态决定后续节点的行为
int ws = pred.waitStatus;
if (ws == Node.SIGNAL)
/*前驱节点为-1 后续节点可以被阻塞
* This node has already set status asking a release
* to signal it, so it can safely park.
*/
return true;
if (ws > 0) {
/*
* Predecessor was cancelled. Skip over predecessors and
* indicate retry.
*/
do {
node.prev = pred = pred.prev;
} while (pred.waitStatus > 0);
pred.next = node;
} else {
/*前驱节点是初始或者共享状态就设置为-1 使后续节点阻塞
* waitStatus must be 0 or PROPAGATE. Indicate that we
* need a signal, but don't park yet. Caller will need to
* retry to make sure it cannot acquire before parking.
*/
compareAndSetWaitStatus(pred, ws, Node.SIGNAL);
}
return false;
}
private final boolean parkAndCheckInterrupt() {
//阻塞线程
LockSupport.park(this);
return Thread.interrupted();
}独占式同步获取锁示例图
