如果子进程已经被终止则该方法立即返回，调用线程将被锁住直到子进程退出。

This method returns immediately if the subprocess has already terminated. If the subprocess has not yet terminated, the calling thread will be blocked until the subprocess exits.

youdao

如果子进程已经被终止则该方法立即返回，调用线程将被锁住直到子进程退出。

This method returns immediately if the subprocess has already terminated. If the subprocess has not yet terminated, the calling thread will be blocked until the subprocess exits.

youdao