[Python-Dev] threading.Semaphore()'s counter can become negative for non-ints

Benjamin Peterson benjamin at python.org
Sat Jan 28 21:07:16 CET 2012

2012/1/28 T.B. <bauertomer at gmail.com>:
> Hello python-dev,
> This is probably worth of a bug report: While looking at threading.py I
> noticed that Semaphore's counter can go below zero. This is opposed to the
> docs: "The counter can never go below zero; ...". Just try:
> import threading
> s = threading.Semaphore(0.5)

But why would you want to pass a float? It seems like API abuse to me.


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