Python threading
From Noah.org
Basic threading example
This is a simple example of threading in Python. You pass it any function and your function is run in a thread loop.
Click to download: thread_looper.py
#!/usr/bin/env python """This demonstrates running a function in a thread loop. This will call a given function over and over in an infinite loop. It will optionally sleep between each call. It will also check a semaphore to see if it should stop. Noah Spurrier $Id: thread_looper.py 249 2008-05-05 02:16:28Z noah $ """ import time import threading class ThreadLooper (threading.Thread): def __init__ (self, sleep_interval, function, args=[], kwargs={}): threading.Thread.__init__(self) self.sleep_interval = sleep_interval self.function = function self.args = args self.kwargs = kwargs self.finished = threading.Event() def stop (self): self.finished.set() self.join() def run (self): while not self.finished.isSet(): self.finished.wait(self.sleep_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 "This calls my_function() every 1/10th of second for two seconds." t = ThreadLooper (0.1, my_function, (1,0,-1)) t.start() # The thread, t, runs while we are asleep. time.sleep(2) t.stop() print "Done!"
Example output:
Calling my_function() in a thread every 1/10th of second for two seconds. meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:33 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:33 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:33 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:33 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:33 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:33 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:33 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:33 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:34 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:34 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:34 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:34 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:34 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:34 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:34 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:34 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:34 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:34 2007 meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:35 2007 Done! meaningless arguments as an example: 1 0 -1 Thu Jun 7 13:34:35 2007