Path: news.daimi.aau.dk!jlk
From: jlk@daimi.aau.dk (J|rgen Lindskov Knudsen)
Newsgroups: comp.lang.beta
Subject: Re: PDES / Concurrency in the BETA Language
Date: 20 Apr 1995 14:14:21 GMT
Organization: DAIMI, Computer Science Dept. at Aarhus University
Lines: 51
Message-ID: <3n5q7t$sgo@belfort.daimi.aau.dk>
References: <3mdqej$6sd@fbi-news.informatik.uni-dortmund.de> <3metl8$h16@engnews2.Eng.Sun.COM> <3mgb73$dn8@harbinger.cc.monash.edu.au>
Reply-To: jlknudsen@daimi.aau.dk (Jorgen Lindskov Knudsen)
NNTP-Posting-Host: lithium.daimi.aau.dk
Keywords: PDES,parallel,discrete,event,simulation,Mjolner,BETA,concurrency

In <3mgb73$dn8@harbinger.cc.monash.edu.au> Thus spake dcmay1@mdw082.cc.monash.edu.au (Mr DC May):

>Dear Jorgen,

>What is the granularity of the concurrency that BETA will support?
>Particularly, I am referring to the difference between monolithic
>Unix-type processes and lightweight threads (e.g. OS/2).

Hello Daniel,

The support for concurrency is/will be both: 

Currently, we do have a distributed object system, in which BETA
objects may reside in two different UNIX processes, and invoke
operations in each others, transparently and with data transfer etc,
just like if the two objects were within the same (sequential) BETA
program.

We are currently investigating lightweight concurrency, which will be
implemented within one single OS process (e.g. in UNIX).  This
implementation will be ala lightweight threads, and hopefully with
support for multiprocessor architectures (like the Sparc).  But no
promices on when this work will be initiated, and definitely not on
when it can be delivered :-)

>P.S.  Did you get the echidna I left for you?  :)

Yes, I have is located on top of my machine - thanks.

Regards,

   Jorgen Lindskov Knudsen, Mjolner Informatics
   Science Park Aarhus, Gustaw Vieds Vej 10, DK-8000 Aarhus C, DENMARK
   E-mail: jlknudsen@mjolner.dk, Phone: +45 86 20 20 00, Fax: +45 86 20 12 22

   ************ BETA information Sources ************************
   * WWW:	http://www.mjolner.dk				*
   *	 	http://www.daimi.aau.dk/~beta/info		*
   * News:	comp.lang.beta					*
   * FAQ:	http://www.daimi.aau.dk/~beta/FAQ		*
   * E-mail:	info@mjolner.dk					*
   * Address:	Mjolner Informatics, Science Park Aarhus,	*
   *	 	Gustav Wieds Vej 10, DK-8000, Aarhus C, DENMARK *
   * Tel.:	+45 86 20 20 00					*
   * Fax.:	+45 86 20 12 22					*
   **************************************************************
--

   Jorgen Lindskov Knudsen, Computer Science Department, Aarhus University
   Ny Munkegade 116, DK-8000 Aarhus C, DENMARK
   E-mail: jlknudsen@daimi.aau.dk, Phone: +45 89 42 32 33, Fax: +45 89 42 32 55