From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Tolpin <dvd@davidashen.net>
Message-Id: <200402191617.i1JGHc7V015598@adat.davidashen.net>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] OT: small xml parser found!
In-Reply-To: <1077206087.1790.18.camel@pc118>
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Date: Thu, 19 Feb 2004 20:17:38 +0400
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> > >> Why isn't Expat suitable?
> > > callbacks are horrible.
> > Reasons?.
>
> Callback-(handler)s are interrupt-(handler)s - remember Dijkstra's
> original (1962?) dismissal of the idea of writing programs with
> interrupt handlers instead of processes as first-class entities. (From
> his paper on The THE Multiprogramming System? I forget the reference.)

This is a misconception. Push API does not demand inequal roles for
the interacting processes.  Define callback handlers to trigger
semaphores instead of calling routines.  This is how it is done
in many systems.

Push APIs can be used equally for either paradigm. And they could
even 42 years ago.

David Tolpin
http://davidashen.net/