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From: bing@galbp.LBP.HARRIS.COM (Bing Bang)
Newsgroups: comp.os.minix
Subject: Re: a question about ar
Message-ID: <328@galbp.LBP.HARRIS.COM>
Date: Wed, 29-Jul-87 10:07:42 EDT
Article-I.D.: galbp.328
Posted: Wed Jul 29 10:07:42 1987
Date-Received: Fri, 31-Jul-87 03:38:16 EDT
References: <310@galbp.LBP.HARRIS.COM> <1542@botter.cs.vu.nl>
Reply-To: bing@galbp.UUCP (Bing Bang)
Organization: Harris/Lanier, Atlanta, GA
Lines: 40

>to replace before 'module'.  Any volunteers on this one?
>
>If you have a serial line driver that works, please post it.  There will be
>a lot of interest.  One was posted earlier, but that one is not fully debugged.
>
>Andy Tanenbaum (ast@cs.vu.nl)


I am about ready to post the serial tty drivers, however there are some
points I'd like to discuss.

First off, the driver is not very V7ish. Things like waiting for carrier
detect and raising and lowering of DTR is done through specialized ioctl
calls, instead of them being implied by openning and closing the device.
How acceptable is this?

Second, I made many changes to the way fs talks to the device drivers and
the way messages are passed in general. Fs now assumes every driver sends
back a SUSPEND message as soon as it receives a message. To do this with
out causing a deadlock condition, I changed the message passing scheme so
that the sender is never blocked. If the receiver is not waiting, a slot
out of a system message buffer pool is allocated, the message copied in to
it, then the buffer is queued to the receiver's que. This change results in
a kernel that is much more multi-tasking. I can now X-OFF my console and
the stuff on the background keeps running. Now, I can post all of these
changes if there is enough interest, or I can post a fixed version of the
tty driver that will work with the standard fs.

Oh, I haven't had time to merge any of the 1.2 kernel changes yet, a task
I am not looking forward to, since I want to preserve my own hack too...
 
oh yea I am still looking for
the source to login.c
and part 7 (of 7) of the new sh diffs


-- 
Bing H. Bang                         +-------------------+
Harris/Lanier                        |MSDOS: just say no.|
Atlanta GA                           +-------------------+