[英]Python, Stop a Thread
我正在尝试创建一个可ping通IP地址并记录连接时间/未连接时间的类。
由于此类是GUI的一部分,因此我希望在用户询问时停止此线程。
找到了一些Q&A来解决此问题,但实际上没有一个导致线程停止。
我正在尝试制作一个方法,该类的一部分将停止self.run()
这是我的Pinger
课:
class Pinger(threading.Thread):
def __init__(self, address='', rate=1):
threading.Thread.__init__(self)
self.address = address
self.ping_rate = rate
self.ping_vector, self.last_ping = [], -1
self.start_time, self.last_status = datetime.datetime.now(), []
self.timestamp, self.time_vector = 0, [datetime.timedelta(0)] * 4
def run(self):
self.start_ping()
def start_ping(self):
self.timestamp = datetime.datetime.now()
while True:
ping_result = os.system('ping %s -n 1 >Null' % self.address)
self.ping_vector.append(ping_result)
if self.last_ping != ping_result:
text = ['Reachable', 'Lost']
print(str(self.timestamp)[:-4], self.address, text[ping_result])
round_time_qouta = datetime.datetime.now() - self.timestamp
self.timestamp = datetime.datetime.now()
self.update_time_counter(ping_result, round_time_qouta)
self.last_ping = ping_result
time.sleep(self.ping_rate)
def update_time_counter(self, ping_result=0, time_quota=datetime.timedelta(0)):
"""self.time_vector = [[cons.succ ping time],[cons.not_succ ping time],
[max accum succ ping time],[max accum not_succ ping time] """
p_vec = [0, 1]
self.time_vector[p_vec[ping_result]] += time_quota
if self.time_vector[p_vec[ping_result]].total_seconds() > self.time_vector[
p_vec[ping_result] + 2].total_seconds():
self.time_vector[p_vec[ping_result] + 2] = self.time_vector[p_vec[ping_result]]
self.time_vector[p_vec[ping_result - 1]] = datetime.timedelta(0)
self.last_status = [ping_result, self.chop_milisecond(self.time_vector[ping_result]),
self.chop_milisecond(self.time_vector[ping_result + 2]),
self.chop_milisecond(datetime.datetime.now() - self.start_time)]
print(str(self.timestamp)[:-4], "State: " + ['Received', 'Lost'][ping_result],
" Duration: " + self.last_status[1], " Max Duration: " + self.last_status[2],
"Total time: " + self.last_status[3])
def chop_milisecond(self, time):
return str(time).split('.')[0]
就像我在评论中说的那样,最简单的方法是使用threading.Event
在线程应退出时向您发出信号。 这样,您可以公开事件并让其他线程对其进行设置,同时可以从线程内检查事件的状态并根据请求退出。
在您的情况下,它可能很简单:
class Pinger(threading.Thread):
def __init__(self, address='', rate=1):
threading.Thread.__init__(self)
self.kill = threading.Event()
# the rest of your setup...
# etc.
def start_ping(self):
self.timestamp = datetime.datetime.now()
while not self.kill.is_set():
# do your pinging stuff
# etc.
然后,每当您希望线程停止运行时(例如从UI中停止),只需对其进行调用: pinger_instance.kill.set()
就可以了。 请记住,寿,这将需要一段时间才能得到杀害,由于阻塞os.system()
调用,由于time.sleep()
你必须在你的最后Pinger.start_ping()
方法。
使用_Thread_stop():
MyPinger._Thread__stop()
我将对您的类进行一些编码,以使其作为守护程序运行。
保留start_ping代码,然后使用下一个代码:
MyPinger = threading.Thread(target = self.start_ping, name="Pinger")
MyPinger.setDaemon(True)
MyPinger.start() # launch start_ping
并可能使用_Thread_stop()停止它,这有点残酷...:
if MyPinger.IsAlive():
MyPinger._Thread__stop()
感谢@zwer的带头。 这是我完整的代码(已标记更改)
class Pinger(threading.Thread):
def __init__(self, address='', rate=1):
threading.Thread.__init__(self)
self.address = address
self.ping_rate = rate
self.ping_vector, self.last_ping = [], -1
self.start_time, self.last_status = datetime.datetime.now(), []
self.timestamp, self.time_vector = 0, [datetime.timedelta(0)] * 4
self.event = threading.Event() # <---- Added
def run(self):
while not self.event.is_set(): # <---- Added
self.start_ping()
self.event.wait(self.ping_rate) # <---- Added ( Time to repeat moved in here )
def stop(self): # <---- Added ( ease of use )
self.event.set() # <---- Added ( set to False and causes to stop )
def start_ping(self):
self.timestamp = datetime.datetime.now()
# While loop ##--- > Deleted. now it loops in run method #####
ping_result = os.system('ping %s -n 1 >Null' % self.address)
self.ping_vector.append(ping_result)
if self.last_ping != ping_result:
text = ['Reachable', 'Lost']
print(str(self.timestamp)[:-4], self.address, text[ping_result])
round_time_qouta = datetime.datetime.now() - self.timestamp
self.timestamp = datetime.datetime.now()
self.update_time_counter(ping_result, round_time_qouta)
self.last_ping = ping_result
#### time.sleep (self.ping_rate) # <---- deleted
def update_time_counter(self, ping_result=0, time_quota=datetime.timedelta(0)):
"""self.time_vector = [[cons.succ ping time],[cons.not_succ ping time],
[max accum succ ping time],[max accum not_succ ping time] """
p_vec = [0, 1]
self.time_vector[p_vec[ping_result]] += time_quota
if self.time_vector[p_vec[ping_result]].total_seconds() > self.time_vector[
p_vec[ping_result] + 2].total_seconds():
self.time_vector[p_vec[ping_result] + 2] = self.time_vector[p_vec[ping_result]]
self.time_vector[p_vec[ping_result - 1]] = datetime.timedelta(0)
self.last_status = [ping_result, self.chop_milisecond(self.time_vector[ping_result]),
self.chop_milisecond(self.time_vector[ping_result + 2]),
self.chop_milisecond(datetime.datetime.now() - self.start_time)]
print(str(self.timestamp)[:-4], "State: " + ['Received', 'Lost'][ping_result],
" Duration: " + self.last_status[1], " Max Duration: " + self.last_status[2],
"Total time: " + self.last_status[3])
def chop_milisecond(self, time):
return str(time).split('.')[0]
def get_status(self):
return self.last_status
c = Pinger('127.0.0.1', 5)
c.start()
time.sleep(10)
c.stop()
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