[issue1641] asyncore delayed calls feature

[Josiah Carlson]

Josiah Carlson <josiahcarlson at users.sourceforge.net> added the comment:

I fixed some bugs with my patch, merged in Giampaolo's tests and 
documentation, and altered the API to match Giampaolo's API almost 
completely.

This new version differs from Giampaolo's patch only in underlying 
implementation; this uses a modified sched.py, and doesn't have a 
standard "execute outstanding methods" function built into asyncore 
(asynchat.scheduled_tasks.run(time.time()) is sufficient).

The major difference is that the modifications to sched.py offer a fast 
cancel/reschedule operation, which Giampaolo's lacks.

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Added file: http://bugs.python.org/file13524/scheduler.patch

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