有没有一种方法可以将线程从线程之外置入睡眠状态？

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() 

有没有一种方法可以让daemon_thread从do_something()以外睡3秒钟？我的意思是假设像daemon_thread.sleep(3)？

Answer 1

创建半秒计数器，然后进行睡眠功能增量该计数器：

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