From: 8440425@wwu.EDU (Richard Golding)
Subject: Message ordering
Date: Fri, 11-Sep-87 19:57:00 EDT [thread overview]
Date: Fri Sep 11 19:57:00 1987
Message-ID: <8709222126.AA13646@ucbvax.Berkeley.EDU> (raw)
"... In a properly designed real-time, multiprocessor, Ada OS, where tasking
across machine boundaries is implemented via messages, the design of the
bus insures that the messages are received in the order that they are
sent out..."
This may be true in some tightly-coupled multiprocessor systems, but it is
patently *not* the case in a distributed system. For a discussion of message-
ordering, see Agha's Actors book. In a widely dispersed system, say across
several millions of miles of space (in the case of remote space probes) there
is simply *no way* you are going to be able to completely guarantee ordering.
- richard golding
8440425@wwu.edu
next reply other threads:[~1987-09-11 23:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
1987-09-11 23:57 Richard Golding [this message]
1987-09-23 16:25 ` Message ordering Steve Hyland
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