Threading related deprecation warnings in Python 3.10

[tirkarthi]

Python 3.10 deprecates camelCase aliases in threading module.

Ref : python/cpython#25174

notifyAll -> notify_all
currentThread -> current_thread

dogpile/util/readwrite_lock.py
65:                # yes. so if a sync operation is waiting, notifyAll to wake
68:                    self.condition.notifyAll()
98:            self.current_sync_operation = threading.currentThread()
120:            if self.current_sync_operation is not threading.currentThread():

[zzzeek]

thanks! are these names in python 3.6? that's our bottom version right now. I would assume they are.

[zzzeek]

"The snake_case names have existed since Python 2.6," - wow! i had no idea.

[sqla-tester]

Karthikeyan Singaravelan has proposed a fix for this issue in the master branch:

Fix DeprecationWarning due to camelCase aliases in Python 3.10. https://gerrit.sqlalchemy.org/c/sqlalchemy/dogpile.cache/+/2840

[sqla-tester]

Karthikeyan Singaravelan has proposed a fix for this issue in the master branch:

Fix DeprecationWarning due to camelCase aliases in Python 3.10. https://gerrit.sqlalchemy.org/c/sqlalchemy/dogpile.cache/+/2840