Python threading

Basic threading example

This runs my_function in a thread loop. Note that you might see "Done!" before the last line of thread output. Welcome to threadland!

#!/usr/bin/env python

import time
import threading 

class roller (threading.Thread): 
    def __init__(self, interval, function, args=[], kwargs={}): 
        threading.Thread.__init__(self) 
        self.interval = interval 
        self.function = function 
        self.args = args 
        self.kwargs = kwargs 
        self.finished = threading.Event() 
    def cancel(self): 
        self.finished.set() 
    def run(self): 
        while not self.finished.isSet(): 
            self.finished.wait(self.interval) 
            self.function(*self.args, **self.kwargs)

def my_function (a, b, c):
    print "meaningless arguments as an example:", a, b, c
    print time.asctime()

print "Calling my_function() in a thread every 1/10th of second for two seconds."
r = roller (0.1, my_function, (1,0,-1))
r.start()
time.sleep(2)
r.cancel()
print "Done!"