它继续执行，直到从远程服务器收到异步回调。
It continues executing until it receives an asynchronous callback from the remote server.
在冻结执行绪后，此方法可让它继续执行。
After a thread has been frozen, this method enables it to continue to execute.
继续执行myprog，它现在应该停止在myproc上。
Resume execution of myprog, which now should stop at myproc.
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