No lock on Counter.dec()

[orzechow]

It seems like you forgot to lock the Counter on dec():

pyformance/pyformance/meters/counter.py

Line 20 in b71056e

def dec(self, val=1):

[omergertel]

Feel free to open a pull request 🤓

[orzechow]

Well I just had a look at your code (when researching for a usage metrics library), but didn't check it out or sth. (still didn't decide on a library).

[MasonEgger]

Since dec() calls inc() which does the lock, I don't think a lock is necessary in dec() This would result in deadlock since the dec() function would hold the lock, then inc() would try to attain it and would be unable to.