Why are the methods sys.exit(), exit(), raise SystemExit not working?

I need an alternative to kill the python script while inside a thread function. My intention is killing the server when the client enters a 0... Is this not working because the threads haven't been terminated? Here is my code:

socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM);
print 'Socket created'

try:
    socket.bind((HOST, PORT))
except socket.error, message:
    print 'Bind statement failed. ERROR: ' + str(message[0]) + ' Message: ' +    message[1]
    sys.exit()

print 'Socket Binding Successful'

socket.listen(10)
print 'Socket is currently listening'


def clientThread(connection):
    while 1:
        data = connect.recv(1024)
        try:
            quit = int(data)
        except:
            quit = 3
        if quit == 0:
            print 'Closing the connection and socket...'
            connect.close()
            socket.close()
            sys.exit(); //Alternative needed here...
            break
        reply = 'Ok....' + data
        if not data:
            break
        connect.sendall(reply)


while 1: #forever loop
    connect, address = socket.accept()
    print 'Just connected with ' + address[0] + ' : ' + str(address[1])
    start_new_thread(clientThread, (connect,))

socket.close()


Asked by: Julian555 | Posted: 06-12-2021






Answer 1

The problem is that all sys.exit() does is raise SystemExit. Since this happens in a worker thread, the effect is to stop that thread (exceptions don't propagate across threads).

You could trying signalling to the main thread that the script needs to terminate, either though some mechanism of your own, or by calling thread.interrupt_main().

For a sledgehammer approach, call os._exit().

Answered by: Clark192 | Posted: 07-01-2022



Answer 2

You can just raise SystemExit but that seems really harsh. Maybe some means of co-operative threading would work (ie: a queue with a sentinel)

Answered by: Anna541 | Posted: 07-01-2022



Similar questions

python - sys.exit() not working, no other threads and no try: blocks capturing SystemExit?

I can't get my Python app to exit. After a call to sys.exit(), python.exe stays running and I have to kill it with task manager. I've spent the past 4 hours looking into this, and I'm stumped. This is Python 3.4.4 on Windows 10 x86. First, I do have a multithreaded application. However I have verified that all threads are exiting with only the main thread running before I call sys.exit(). (I did thi...


python - Unittest causing sys.exit()

No matter what I do sys.exit() is called by unittest, even the most trivial examples. I can't tell if my install is messed up or what is going on. IDLE 1.2.2 ==== No Subprocess ==== >>> import unittest >>> >>> class Test(unittest.TestCase): def testA(self): a = 1 self.assertEqual(a,1) >>> unittest.main() option -n not recognized Usa...


python - Handle sys.exit() in cherrypy service

When you start/stop a python cherrypy service (compiled with py2exe), this works fine When I get a sys.exit() call (from my error handler), cherrypy quits, but the service remains hanging. Code: import cherrypy import win32serviceutil import win32service import sys SERVICE = None class HelloWorld: """ Sample request handler class. """ def __init__(self): self.iVal = ...


linux - How to bypass the 0-255 range limit for sys.exit() in python?

In python (on a Linux system), I'm launching a command using os.system() and retrieving the return code. If that return code is different from 0, I would like to make the program exit with that same return code. So I wrote: ret = os.system(cmd) if ret != 0: print "exit with status %s" % ret sys.exit(ret) When the return code is lower than 256, it works fine, but when it'...


Python sys.exit() help?

I am working in Python and am trying to have a line of code execute and after it executes I am calling sys.exit() to have the script itself "exit." However, it seems that sys.exit() is executing before the line of code above it executes. Below is the code I am trying to implement: if something == True: self.redirect('http://www.google.com/') sys.exit() The...


mocking - How to get around "sys.exit()" in python nosetest?

It seems that python nosetest will quit when encountered sys.exit(), and mocking of this builtin doesn't work.


import - python: Importing scipy.io seems to prevent sys.exit() to work properly

Under Windows, executing the following Python script I get an ERRORLEVEL of 0 instead of the expected 2. import sys import scipy.io sys.exit(2) If I remove the import scipy.io, I got the correct ERRORLEVEL of 2... Any idea why importing scipy.io cause such an issue? PS: windows 7, python 2.72, scipy 0.10.1 Calling help(sys.exit) just before the sys.exit call return...


python - Issue with sys.exit() in pygame

I am learning to use Pygame, and when I use sys.exit(), I run into a problem. Here is the code: import pygame, sys,os from pygame.locals import * pygame.init() window = pygame.display.set_mode((468, 60)) pygame.display.set_caption('Game') screen = pygame.display.get_surface() file_name = os.path.join("data","image.bmp") surface = pygame.image.load(file_name) screen.blit(surface, (0,0)...


How to use sys.exit() in Python

player_input = '' # This has to be initialized for the loop while player_input != 0: player_input = str(input('Roll or quit (r or q)')) if player_input == q: # This will break the loop if the player decides to quit print("Now let's see if I can beat your score of", player) break if player_input != r: print('invalid choice, try again') if player_input ==r: roll...


python - Is it possible for a unit test to assert that a method calls sys.exit()?

I have a Python 2.7 method that sometimes calls sys.exit(1) Is it possible to make a unit test that verifies this line of code is called when the right conditions are met?


python - how to continue execution after sys.exit() command

Here i'm reading and comparing values from the two logs using 'for' loop.Problem is i'm not able to continue to next TC after sys.exit command. Let me know if required more clarification f = open('/tmp/ftplog', 'r') for line in f: m = re.findall("5\d+", line) #print m fd = open('/tmp/tellog', 'r') for line in fd: n = re.findall(r"5\d+", line) #prin...






Still can't find your answer? Check out these communities...



PySlackers | Full Stack Python | NHS Python | Pythonist Cafe | Hacker Earth | Discord Python



top