I have two threads, one running min() and the other running max() over
the same list. I'm getting some mysterious results which I'm having
trouble debugging. Are min() and max() thread-safe, or am I doing
something fundamentally silly by having them walk over the same list
simultaneously?
My code is as follows. Is there anything obviously wrong with it?
import threading, time
class MMThread(threading.Thread):
def __init__(self, data, func, target, where):
super(MMThread, self).__init__()
self._data = data
self._func = func
self._target = target
self._where = where
def run(self):
self._target[self._where] = self._func(self._data)
def minmax(seq):
result = [None, None]
t1 = MMThread(seq, min, result, 0)
t2 = MMThread(seq, max, result, 1)
t1.start()
t2.start()
# Block until all threads are done.
while any([t1.isAlive(), t2.isAlive()]):
time.sleep(0)
assert None not in result
return tuple(result)
--
Steven
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