stop program python
# Do stuff
stop = input("Would you like to stop the program? ")
if stop == "y":
exit()
else:
# do stuffstop program python
# Do stuff
stop = input("Would you like to stop the program? ")
if stop == "y":
exit()
else:
# do stuffthread stop python
# Python program using
# traces to kill threads
import sys
import trace
import threading
import time
class thread_with_trace(threading.Thread):
def __init__(self, *args, **keywords):
threading.Thread.__init__(self, *args, **keywords)
self.killed = False
def start(self):
self.__run_backup = self.run
self.run = self.__run
threading.Thread.start(self)
def __run(self):
sys.settrace(self.globaltrace)
self.__run_backup()
self.run = self.__run_backup
def globaltrace(self, frame, event, arg):
if event == 'call':
return self.localtrace
else:
return None
def localtrace(self, frame, event, arg):
if self.killed:
if event == 'line':
raise SystemExit()
return self.localtrace
def kill(self):
self.killed = True
def func():
while True:
print('thread running')
t1 = thread_with_trace(target = func)
t1.start()
time.sleep(2)
t1.kill()
t1.join()
if not t1.isAlive():
print('thread killed')
In this code, start() is slightly modified to set the system trace function using settrace().
The local trace function is defined such that,
whenever the kill flag (killed) of the respective thread is set,
a SystemExit exception is raised upon the excution of the next line of code,
which end the execution of the target function func.
Now the thread can be killed with join().Copyright © 2021 Codeinu
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