In article <[EMAIL PROTECTED]>,
Skip Montanaro <[EMAIL PROTECTED]> wrote:
>
>Obviously, if you want multiple counters for some reason a little
>information hiding with a class would help (also untested):
>
> import Queue
>
> class Counter:
> def __init__(self, start=0):
> self.counter = Queue.Queue()
> self.counter.put(start)
>
> def __call__(self):
> i = self.counter.get()
> self.counter.put(i+1)
> return i
This is one case where'd recommend using a plan RLock() instead of using
Queue -- the RLock() will be more efficient:
import threading
class Counter:
def __init__(self, start=0, increment=1):
self.counter = start
self.increment = increment
self.lock = threading.RLock()
def __call__(self):
self.lock.acquire()
self.counter += self.increment
i = self.counter
self.lock.release()
return i
There are several tricks one can use to squeeze further efficiency gains
from this, including using Lock() instead of RLock().
--
Aahz ([EMAIL PROTECTED]) <*> http://www.pythoncraft.com/
"The joy of coding Python should be in seeing short, concise, readable
classes that express a lot of action in a small amount of clear code --
not in reams of trivial code that bores the reader to death." --GvR
--
http://mail.python.org/mailman/listinfo/python-list
