[Twisted-Python] What is the meaning of "threadable.whenThreaded is deprecated Use application-level logic instead"

Helo , Vhat is the meaning of "Use application-level logic instead" ? import twisted.internet.threads /usr/lib/python2.4/site-packages/twisted/python/context.py:74: DeprecationWarning: threadable.whenThreaded is deprecated. Use application-level logic instead. threadable.whenThreaded(initThreads)