Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!bu.edu!inmet!stt
From: stt@inmet.inmet.com
Newsgroups: comp.lang.ada
Subject: Re: Hiding Concurrency
Message-ID: <20600102@inmet>
Date: 21 Apr 91 21:09:00 GMT
References: <671951147@<jls>
Lines: 17
Nf-ID: #R:<jls:671951147:inmet:20600102:000:664
Nf-From: inmet.inmet.com!stt    Apr 21 17:09:00 1991


Re: Hiding Concurrency; semaphores in ADTs, etc.

Providing better support for data-oriented synchronization
is a high priority for the Ada 9X revision.  We are addressing
both the issue of synchronizing access to shared data without
introducing an additional task, as well as the importance of
by-reference parameter passing when passing shared or volatile
data objects.  For now, explicit use of access values to prevent
by-copy parameter passing may be the only "portable" solution,
though most compilers have an upper bound on the size of the
object they will pass by copy.

S. Tucker Taft
Ada 9X Mapping/Revision Team
Intermetrics, Inc.
Cambridge, MA  02138