NetNews Usenet Archive 1992 #26/NN_1992_26.iso/spool/comp/lang/c/16392

Text File | 1992-11-12 | 1.6 KB | 42 lines

Newsgroups: comp.lang.c
Path: sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!sun-barr!sh.wide!ascwide!ascgw!gctgw!dave
From: [e-mail] (Dave)
Subject: How to broadcast messages to processes?
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: GC Technology
Distribution: comp
Date: Thu, 12 Nov 1992 12:24:34 GMT
Lines: 30

Howdy net,

I'm trying to set up a package where processes (compiled C programs) can
send each other public messages.  I've been studying my RISC/os
Programmer's Guide, and have got through messages and pipes, and so far it
looks like there aren't any real broadcast tools.

I mean, when you set up a pipe or a message queue, you can make it so that
any process can read it.  But when a single process reads the queue, that
amount of read info goes away, and other processes won't be able to read
it.  At least, that's what I gathered from the manual.

What I want to do is have a mesage readable by all processes, as many
times as they want.  I only want messages to get deleted when the channel
goes away.

I figured that I could do this with message queues by having the reading
process re-send the exact same message it just read, so that it is in
effect not removed from the queue.  But this has the problem that there is
a finite amount of time between the read and the re-post in which the
message does not exist on the queue.  And my hawkish little processes are
sure to get hung up on that delay.

Can somebody point me in a broadcast direction?

TIA,
Dave
----
David Wuertele, GC Technologies, Algorithm Research
[e-mail]    [e-mail]