Difference between revisions of "Python threading"
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<pre> | <pre> | ||
#!/usr/bin/env python | #!/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. | ||
| + | """ | ||
import time | import time | ||
Revision as of 15:44, 26 June 2007
Basic threading example
This is a simple example of threading in Python. This runs my_function() in a thread loop.
#!/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.
"""
import time
import threading
class thread_looper (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 stop (self):
self.finished.set()
self.join()
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."
t = thread_looper (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
