Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!modcomp!andy
From: andy@modcomp.uucp (Andy Tate)
Newsgroups: comp.realtime
Subject: Re: Device Drivers
Message-ID: <andy.659371226@rlxdev>
Date: 23 Nov 90 14:40:26 GMT
References: <1990Nov20.095649.7328@computing-maths.cardiff.ac.uk>
Sender: news@modcomp.uucp (Mr. News)
Organization: MODCOMP, an AEG company
Lines: 32

rhl@computing-maths.cardiff.ac.uk (Robert Hartill) writes:

>As part of my research into writing a realtime operating system for a 80386
>programmable communications controller, i'm now looking into the different
>approaches taken to implement device drivers.

>At the moment i'm looking at UNIX (yuck!!).

>If anyone out there has some info that will save me some time (and work!)
>i would be grateful.

>Has anyone implemented a form of STREAMS in a realtime OS ?

>-----
>  Robert Hartill.
>  Dept' Of Computing Mathematics,
>  UWCC,
>  Cardiff,
>  UK. 

Yes, we have implemented STREAMS under our fully preemptive REAL/IX
O/S.  There are several interfaces which use STREAMs under REAL/IX  
such as BSD "in-kernel" sockets, AT&T's TLI, and application software which  
make direct references to the driver(s) beneath.  Any process executing
in REAL/IX STREAMs can be preempted by a higher priority process.

Andrew Tate
MODCOMP, an AEG Company 
Advanced Systems Development
Ft. Lauderdale, FL

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