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[英]who and when notify the thread.wait() when thread.join() is called?
[英]how to notify lock when calling thread.join()
簡單描述
public static void main(String[] args ){
Thread t = new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("Thread stopped");
}
});
try {
t.start();
t.join();
System.out.println("task completed");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
t.join()
主線程等待其子線程t死亡。 t.join()
的調用堆棧就像
join -> join(0)
public final synchronized void join(long millis)
throws InterruptedException {
long base = System.currentTimeMillis();
long now = 0;
if (millis < 0) {
throw new IllegalArgumentException("timeout value is negative");
}
if (millis == 0) {
while (isAlive()) {
wait(0);
}
} else {
while (isAlive()) {
long delay = millis - now;
if (delay <= 0) {
break;
}
wait(delay);
now = System.currentTimeMillis() - base;
}
}
}
主體鎖定對象t並等待通知。 我在何時何地調用通知時有些困惑。 原生函數stop0()
調用它嗎?
看一下: 誰以及何時在調用thread.join()時通知thread.wait()?
run()完成之后,Thread子系統將調用notify()。
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