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    /* 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 final Object blockerLock = new Object();

    /* Set the blocker field; invoked via jdk.internal.access.SharedSecrets
     * from java.nio code
     */
    static void blockedOn(Interruptible b) {
        Thread me = Thread.currentThread();
        synchronized (me.blockerLock) {
            me.blocker = b;
        }
    }