Links for jarn.checkinterval
jarn.checkinterval-1.0.zip
http://docs.python.org/library/asyncore.html
http://docs.python.org/library/sys.html#sys.setcheckinterval
http://mail.zope.org/pipermail/zope/2002-June/116598.html
http://www.dabeaz.com/python/GIL.pdf