Path: utzoo!utgpu!attcan!uunet!cbmvax!higgin
From: higgin@cbmvax.UUCP (Paul Higginbottom MKT)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Timer question
Message-ID: <5635@cbmvax.UUCP>
Date: 6 Jan 89 15:09:36 GMT
References: <427@tekn01.chalmers.se> <3210@amiga.UUCP> <3137@sugar.uu.net> <5584@cbmvax.UUCP> <3209@sugar.uu.net>
Reply-To: higgin@cbmvax.UUCP (Paul Higginbottom MKT)
Organization: Commodore Technology, West Chester, PA
Lines: 38

In article <3209@sugar.uu.net> karl@sugar.uu.net (Karl Lehenbauer) writes:
$I have written code based on Paul Higginbottom's code published in Amiga mail
$that uses one of the CIA timers to provide a microsecond-resolution realtime
$clock.

Someone used it!  I feel good.

$[describes his application... deleted]
$
$It works.

Even better!

$But I think it needs to be a library, see, because I already have a couple
$MIDI programs that need to make use of it.  I was thinking "library" because
$it provides a way for tasks to locate the address of the long word that's
$being incremented by the interrupt routine.

This is true.  When I wrote the code I realized that it really wasn't
"multi-tasking friendly" but my need for the functionality (as it would seem
yours) was overwhelming so I did it the way it was published.

Ideally it could be done as a handler with clients added such that each
client's timer variable can be updated.  Ooh, but how does that work given
each client will want different precision?  Perhaps a "minimum precision"
must be set, and all client precisions are a multiple of this?  This could
mean a LOT of interrupts for the main handler.  Solutions?

$So I'd like a little feedback on this, and any notes on how to make it a 
$library if that's the way to go.  

It's unclear to me how a library would help.

$-- uunet!sugar!karl  | "We've been following your progress with considerable 
$-- karl@sugar.uu.net |  interest, not to say contempt."  -- Zaphod Beeblebrox IV
$-- Usenet BBS (713) 438-5018

	Paul.