在这种情况下，使用事件作为信号传递机制就可以了，实际上在线程模块docs中建议使用。
如果您希望线程正常停止，请使其成为非守护进程，并使用适当的信号传递机制，例如
Event。
验证线程终止时，超时几乎总是会引入错误空间。因此，虽然将
.join()with超时用于触发事件的初始决策是可以的，但最终验证应使用
.join()没有超时的a
进行。
# wait 30 seconds for the thread to finish its workt.join(30)if t.is_alive(): print "thread is not done, setting event to kill thread." e.set() # The thread can still be running at this point. For example, if the # thread's call to isSet() returns right before this call to set(), then # the thread will still perform the full 1 second sleep and the rest of # the loop before finally stopping.else: print "thread has already finished."# Thread can still be alive at this point. Do another join without a timeout # to verify thread shutdown.t.join()
可以简化为以下形式：
# Wait for at most 30 seconds for the thread to complete.t.join(30)# Always signal the event. Whether the thread has already finished or not, # the result will be the same.e.set()# Now join without a timeout knowing that the thread is either already # finished or will finish "soon."t.join()
