Difference between revisions of "Python threading"

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<include svncat src="file:///home/svn/src/python/thread_looper.py" highlight="python" />
 
<include svncat src="file:///home/svn/src/python/thread_looper.py" highlight="python" />
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<pre>
 
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#!/usr/bin/env python
 
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"""This demonstrates running a function in a thread loop. This will call a
 
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given function over and over in an infinite loop. It will optionally sleep
 
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between each call. It will also check a semaphore to see if it should stop.
 
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"""
 
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import time
 
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import threading
 
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class thread_looper (threading.Thread):
 
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    def __init__ (self, interval, function, args=[], kwargs={}):
 
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        threading.Thread.__init__(self)
 
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        self.interval = interval
 
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        self.function = function
 
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        self.args = args
 
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        self.kwargs = kwargs
 
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        self.finished = threading.Event()
 
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    def stop (self):
 
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        self.finished.set()
 
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        self.join()
 
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    def run (self):
 
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        while not self.finished.isSet():
 
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            self.finished.wait(self.interval)
 
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            self.function(*self.args, **self.kwargs)
 
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def my_function (a, b, c):
 
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    print "meaningless arguments as an example:", a, b, c
 
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    print time.asctime()
 
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print "Calling my_function() in a thread every 1/10th of second for two seconds."
 
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t = thread_looper (0.1, my_function, (1,0,-1))
 
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t.start()
 
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# The thread, t, runs while we are asleep.
 
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time.sleep(2)
 
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t.stop()
 
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print "Done!"
 
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</pre>
 
  
 
Example output:
 
Example output:

Revision as of 12:00, 2 August 2007


Basic threading example

This is a simple example of threading in Python. This runs my_function() in a thread loop.

<include svncat src="file:///home/svn/src/python/thread_looper.py" highlight="python" />

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
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