Thread Trace.

threadtrace.py

#!/usr/bin/env python3
# https://www.geeksforgeeks.org/python-different-ways-to-kill-a-thread/
import sys 
import threading 

class ThreadTrace(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


if __name__ == "__main__":
    # Testing ...

    import time

    def func(): 
        while True: 
            print("thread running") 

    t1 = ThreadTrace(target = func) 
    t1.start() 
    time.sleep(2) 
    t1.kill() 
    t1.join() 
    if not t1.isAlive(): 
        print("thread killed")