问JavaLangAccess.blockedOn(线程t，可中断b)是做什么的？

EN

/* The object in which this thread is blocked in an interruptible I/O
 * operation, if any.  The blocker's interrupt method should be invoked
 * after setting this thread's interrupt status.
 */
private volatile Interruptible blocker;
private Object blockerLock = new Object();

/* Set the blocker field; invoked via sun.misc.SharedSecrets from java.nio code
 */
void blockedOn(Interruptible b) {
synchronized (blockerLock) {
    blocker = b;
}
}

/* The object in which this thread is blocked in an interruptible I/O
 * operation, if any.  The blocker's interrupt method should be invoked
 * after setting this thread's interrupt status.
 */
private volatile Interruptible blocker;
private Object blockerLock = new Object();

/* Set the blocker field; invoked via sun.misc.SharedSecrets from java.nio code
 */
void blockedOn(Interruptible b) {
    synchronized (blockerLock) {
         blocker = b;
    }
}
public void interrupt() {
    if (this != Thread.currentThread())
        checkAccess();

    synchronized (blockerLock) {
        Interruptible b = blocker;
        if (b != null) {
        interrupt0();        // Just to set the interrupt flag
        b.interrupt();
        return;
        }
    }
    interrupt0();
}