Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!decvax!ucbvax!i91@seismo.CSS.GOV@nikhefh.UUCP
From: i91@seismo.CSS.GOV@nikhefh.UUCP
Newsgroups: mod.computers.apollo
Subject: Submission for mod-computers-apollo
Message-ID: <8701162016.AA02494@nikhefh.uucp>
Date: Fri, 16-Jan-87 15:16:52 EST
Article-I.D.: nikhefh.8701162016.AA02494
Posted: Fri Jan 16 15:16:52 1987
Date-Received: Sun, 18-Jan-87 18:35:56 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 43
Approved: apollo@yale-comix.arpa

Path: nikhefh!i91
From: i91@nikhefh.UUCP (Fons Rademakers)
Newsgroups: mod.computers.apollo
Subject: Need help, read the message.
Message-ID: <246@nikhefh.UUCP>
Date: 16 Jan 87 20:16:52 GMT
Reply-To: i91@nikhefh.UUCP (Fons Rademakers)
Distribution: world
Organization: Nikhef-H, Amsterdam (the Netherlands).
Lines: 32

Hello Apollo experts,
I need some help!

Introductuon to the question:

I made an interprocess communications package using
IPC calls. With this package it is possible to send messages
from one program to another, wait for messages from one or more
programs, etc. The package works basically very nice, also
when the programs are spread over different nodes. However, problems
can occur when one program tries to send something to another
program while that other program is not listening. To prevent
this I could use MUTEX locks as semaphores, i.e. a program may
only send to another program when the semaphore of that program is set.
I also tried the technique of creating/deleting a little file as semaphore,
but this turned out to be very time consuming.

Problem:  
With this solution I lose the possibility of running the
programs on different nodes.      

Question:
Is there an elegant solution to this problem? If so, let me know.
If not, let me also know.

Thanks in advance,
     Fons Rademakers
-- 
Org:    NIKHEF-H, National Institute for Nuclear and High-Energy Physics.
Mail:   Kruislaan 409, P.O. Box 41882, 1009 DB Amsterdam, the Netherlands
BITNET: U00029@HASARA5.BITNET                       Telex: 10262 (hef nl)
UUCP:   {decvax,cernvax,uck,unido,vmucnam,seismo}!mcvax!nikhefh!i91