有沒有一種方法可以將線程從線程之外置入睡眠狀態？

Question

import time 
import threading 


def do_something(): 
    while True: 
     time.sleep(0.5) 
     print('I am alive') 


def main(): 
    while True: 
     time.sleep(1) 
     print('Hello') 


daemon_thread = threading.Thread(target=do_something, daemon=True) 
daemon_thread.start() 
main() 

有沒有一種方法可以讓daemon_thread從do_something()以外睡3秒鐘？我的意思是假設像daemon_thread.sleep(3)？

Answer 1

創建半秒計數器，然後進行睡眠功能增量該計數器：

lock = Lock() 
counter = 0 


def do_something(): 
    global counter 
    while True: 
     time.sleep(0.5) 
     with lock: 
      if counter == 0: 
       print('I am alive') 
      else: 
       counter -= 1 


def increment(seconds): 
    global counter 
    with lock: 
     counter += 2*seconds 


# after starting thread 

increment(3) # make the thread wait three seconds before continuing