LockSupport基本使用

// 暂停当前线程
LockSupport.park(); 
// 恢复某个线程的运行
LockSupport.unpark(暂停线程对象)

先 park 再 unpark

Thread t1 = new Thread(() -> {
     log.debug("start...");
     sleep(1);
     log.debug("park...");
     LockSupport.park();
     log.debug("resume...");
},"t1");
t1.start();
sleep(2);
log.debug("unpark...");
LockSupport.unpark(t1);

输出

18:42:52.585 c.TestParkUnpark [t1] - start... 18:42:53.589 c.TestParkUnpark [t1] - park... 18:42:54.583 c.TestParkUnpark [main] - unpark... 18:42:54.583 c.TestParkUnpark [t1] - resume...

先 unpark 再 park

Thread t1 = new Thread(() -> {
     log.debug("start...");
     sleep(2);
     log.debug("park...");
     LockSupport.park();
     log.debug("resume...");
}, "t1");
t1.start();
sleep(1);
log.debug("unpark...");
LockSupport.unpark(t1);

输出

18:43:50.765 c.TestParkUnpark [t1] - start... 
18:43:51.764 c.TestParkUnpark [main] - unpark... 
18:43:52.769 c.TestParkUnpark [t1] - park... 
18:43:52.769 c.TestParkUnpark [t1] - resume...