[medusa] select, signals, and "interrupted system call" (EINTR)

[Sam Rushing]

Jim Fulton writes:
> The asyncore main loop should check for this error in it's select
> call and the select module should make this error easier to check
> for.

It might go better into the event_loop function, which I think of as a
more user-serviceable part. [for example, the default loop vs. the
one in medusa/event_loop.py that supports schedulable events]

> I presume that this works in Python 1.6/2.0, but I
> haven't tried it yet?
> 
> This depends on the structure of select.error values
> and requires that we get EINTR from somewhere. (What
> should the value be on NT?) 

If it's a big problem, I guess we could use a different default
event_loop() function for win32 vs. unix.

> At a minimum, code like the above should be added to asyncore.
> 
> Thoughts?

This has been asked for several times, I agree it'd be nice to have at
least a note in the docs..

-Sam