JUC——线程同步锁（LockSupport阻塞原语）

 public static void park(Object blocker) {
    Thread t = Thread.currentThread();
    setBlocker(t, blocker);
    unsafe.park(false, 0L);
    setBlocker(t, null);
}

public static void unpark(Thread thread) {
    if (thread != null)
        unsafe.unpark(thread);
}

package so.strong.mall.concurrent;
import java.util.concurrent.locks.LockSupport;

public class LockSupportDemo {
    private static String msg = null;
    public static void main(String[] args) {
        final Thread mainThread = Thread.currentThread(); //获取当前线程
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    msg = "itermis.com";
                } finally {
                    LockSupport.unpark(mainThread); //不管线程的操作如何，都要解除挂起状态
                }
            }
        }).start();
        LockSupport.park(mainThread);
        System.out.println("**********主线程执行完毕，msg=" + msg);
    }
}