無法停止運行線程

Question

我有一個執行 3 個不同線程的 python 程序。

t1 = Thread(target=calculate_statistics, args=(ip_slave_1, path_script_slave_1, logger))
t1.daemon = True
t1.start() 
t2 = Thread(target=calculate_statistics, args=(ip_slave_2, path_script_slave_2, logger))
t2.daemon = True
t2.start() 
t3 = Thread(target=computing, args=("1"))
t3.daemon = True
t3.start() 
t1.join()
t2.join()
t3.join()

線程執行良好。 問題是要停止整個程序，我必須多次按CTRL + C。我在屏幕上看到這條消息： (FIRST CTRL + C) ：

^CTraceback (most recent call last):
  File "/mnt/roaming.py", line 116, in <module>
    t1.join()
  File "/usr/lib/python3.9/threading.py", line 1060, in join
  File "/usr/lib/python3.9/threading.py", line 1080, in _wait_for_tstate_lock

c (第二個 CTRL + C)

^CException ignored in: <module 'threading' from '/usr/lib/python3.9/threading.pyc'>
Traceback (most recent call last):
  File "/usr/lib/python3.9/threading.py", line 1477, in _shutdown
KeyboardInterrupt:

每個線程都在執行一個無限循環。 按CTRL + C時如何殺死線程？ 這是線程函數：

def calculate_statistics(ip_slave, path_script_slave, logger):
    while True:
      current_time = datetime.datetime.now()
      result = os.popen("perl " + str(path_script_slave) + "SYSTEMCMD.pl uf_rxinfo all").read()
      rssi = result.split(",",1)[1]
      rssi = rssi.split(",",1)[0]
      agc = result.split(",",1)[1]
      agc = agc.split(",",1)[1]
      agc = agc.split(",",1)[0]
      auth = result.split(",",1)[1]
      auth = auth.split(",",1)[1]
      auth = auth.split(",",1)[0]
      print("[" + str(current_time) + "]"+"[SLAVE]" + "[" + str(ip_slave) + "] " +"RSSI: " + str(rssi) + "; AGC: " + str(agc) + "; AUTH: " + str(auth) +".")
      row = str(current_time) + " -IP " + str(ip_slave) + " -RSSI " + str(rssi) + " -AGC " + str(agc) + " -AUTH " + str(auth)
      logger.info(row)
      time.sleep(0.2)
def computing(f_name):
    time.sleep(1)
    while True:
      a_file = open("slaves.log", "r")
      lines = a_file.readlines()
      last_lines = lines[-8:]
      rssi_slave_1 = []
      rssi_slave_2 = []
      agc_slave_1 = []
      agc_slave_2 = []
      auth_slave_1 = []
      auth_slave_2 = []
      f = open("diff.log", "w")
      for element in last_lines:
        f.write(str(element))
        if(element.split("-IP")[1].split(" ")[1]) == str(ip_slave_1):
          rssi_slave_1.append(element.split("-RSSI")[1].split(" ")[1])
          agc_slave_1.append(element.split("-AGC")[1].split(" ")[1])
          auth_slave_1.append(element.split("-AUTH")[1].split(" ")[1].split("\n")[0])
        else:
          rssi_slave_2.append(element.split("-RSSI")[1].split(" ")[1])
          agc_slave_2.append(element.split("-AGC")[1].split(" ")[1])
          auth_slave_2.append(element.split("-AUTH")[1].split(" ")[1].split("\n")[0])          
      f.close()
      print(rssi_slave_1)
      print(rssi_slave_2)
      print(agc_slave_1)
      print(agc_slave_2)
      print(auth_slave_1)
      print(auth_slave_2)
      algorithm(rssi_slave_1,rssi_slave_2,agc_slave_1,agc_slave_2,auth_slave_1,auth_slave_2)
      time.sleep(1)

Answer 1

規范的方法是讓您的主線程在無限循環中等待，並用threading.Event向其他線程發出信號，並用等待該事件設置的東西替換線程內的任何無限循環。

stop_event.wait(x)將替換您在處理循環中的任何 time.sleep(x time.sleep(x) 。

import random
import threading
import time

stop_event = threading.Event()


def ponder(thing):
    while not stop_event.wait(random.uniform(0.9, 1.1)):
        print(f"Thinking about {thing}...")
    print(f"Ah! Stopping thinking about {thing}.")


threads = [
    threading.Thread(target=ponder, args=(arg,))
    for arg in ["spam", "eggs", "toast"]
]

for thread in threads:
    thread.start()

while True:
    try:
        time.sleep(1)
    except KeyboardInterrupt:
        print("Keyboard interrupt caught.")
        stop_event.set()
        break

for thread in threads:
    thread.join()

print("Done!")

這個例子的輸出是例如

Thinking about eggs...
Thinking about spam...
Thinking about toast...
Thinking about eggs...
Thinking about spam...
Thinking about toast...
Thinking about toast...
Thinking about eggs...
Thinking about spam...
Thinking about spam...
Thinking about toast...
Thinking about eggs...
^CKeyboard interrupt caught.
Ah! Stopping thinking about spam.
Ah! Stopping thinking about toast.
Ah! Stopping thinking about eggs.
Done!