From: kilgallen@eisner.decus.org (Larry Kilgallen)
Subject: Re: Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation)
Date: 1996/11/05
Date: 1996-11-05T00:00:00+00:00 [thread overview]
Message-ID: <1996Nov5.083552.1@eisner> (raw)
In-Reply-To: EACHUS.96Nov4182340@spectre.mitre.org
In article <EACHUS.96Nov4182340@spectre.mitre.org>, eachus@spectre.mitre.org (Robert I. Eachus) writes:
> In article <1996Nov4.072757.1@eisner> kilgallen@eisner.decus.org (Larry Kilgallen) writes:
>
> > Running under an operating system on a uniprocessor there clearly
> > must be a method of yielding to the lock-holder. In a preemptive
> > scheduling environment this is automatic (although a yielding call
> > is more polite). In a non-preemptive scheduling environment,
> > a simple call to yield the processor should suffice, and that
> > still leaves the overhead as approximately a memory read and
> > test.
>
> Not to pick on Larry--or anyone participating in this
> discussion--but I am really confused. Since all of the possible
> modifications of Bounded_Strings must be done (legally) through a few
> calls in the package, and Ada rules are really very clear in this
> area, the Bounded_Strings package doesn't have to maintain any locks.
>
> It is the case that if you want to have a program which has
> multiple tasks which reference the same bounded string, and one of
> them does an update, then you have to have a synchronization point
> before the next reference.
I think the issue may be one of terminology clash. What Ada folk
call a synchronization point may very well be implemented in what
OS folk call a spinlock. I responded to what struck me as an
OS-style discussion (I did not introduce the term spinlock to
the thread) using OS-speak. Perhaps we should be talking
about the overhead of a "synchronization point", but the
original claim was that it can be cheap where there is no
contention, so if nobody disagrees we can forget the term
"spinlock" was ever mentioned :-)
Larry
next prev parent reply other threads:[~1996-11-05 0:00 UTC|newest]
Thread overview: 250+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-10-08 0:00 Once again, Ada absent from DoD SBIR solicitation Gregory Aharonian
1996-10-08 0:00 ` Gandalf
1996-10-09 0:00 ` Bill Nielsen
1996-10-09 0:00 ` Stanley R. Allen
1996-10-09 0:00 ` C++ Standardization (was: Once again, Ada absent from DoD SBIR solicitation) David Shochat
1996-10-10 0:00 ` Robert Dewar
1996-10-10 0:00 ` David Shochat
1996-10-20 0:00 ` Richard Riehle
1996-10-20 0:00 ` nasser
1996-10-21 0:00 ` Shayne Flint
1996-10-21 0:00 ` Robert A Duff
1996-10-21 0:00 ` Robert Dewar
1996-10-22 0:00 ` Ken Garlington
1996-10-22 0:00 ` Shayne Flint
1996-10-22 0:00 ` Robert A Duff
1996-10-22 0:00 ` Rush Kester
1996-10-11 0:00 ` Ed Falis
1996-10-11 0:00 ` Robert Dewar
1996-10-12 0:00 ` Kevin D. Heatwole
1996-10-12 0:00 ` Robert Dewar
1996-10-13 0:00 ` Larry Kilgallen
1996-10-13 0:00 ` Ed Falis
1996-10-11 0:00 ` Dave Wood
1996-10-11 0:00 ` Dave Wood
1996-10-17 0:00 ` Garbage Collection in Ada Thomas Kendelbacher
1996-10-10 0:00 ` Once again, Ada absent from DoD SBIR solicitation Mike Stark
1996-10-10 0:00 ` Stanley R. Allen
1996-10-11 0:00 ` Mitch Gart
1996-10-11 0:00 ` Ken Garlington
1996-10-11 0:00 ` Robert Dewar
1996-10-14 0:00 ` Mitch Gart
1996-10-14 0:00 ` Ken Garlington
1996-10-14 0:00 ` Norman H. Cohen
1996-10-14 0:00 ` Bevin R. Brett
1996-10-10 0:00 ` Mitch Gart
1996-10-10 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Brian Rogoff
1996-10-10 0:00 ` Dave
1996-10-11 0:00 ` Robert Dewar
1996-10-12 0:00 ` davedave
1996-10-12 0:00 ` Robert Dewar
1996-10-13 0:00 ` Larry Kilgallen
1996-10-11 0:00 ` Tucker Taft
1996-10-14 0:00 ` Brian Rogoff
1996-10-15 0:00 ` Mike Stark
1996-10-15 0:00 ` Robert Dewar
1996-10-16 0:00 ` Mike Stark
1996-10-17 0:00 ` Robert A Duff
1996-10-17 0:00 ` Why no Propagates? Matthew Heaney
1996-10-18 0:00 ` Robert A Duff
1996-10-18 0:00 ` Robert Dewar
1996-10-18 0:00 ` Norman H. Cohen
1996-10-18 0:00 ` Robert Dewar
1996-10-15 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Robert A Duff
1996-10-15 0:00 ` Robert Dewar
1996-10-15 0:00 ` Portability of Arithmetic (was: Java vs Ada 95) Larry Kilgallen
1996-10-16 0:00 ` Robert A Duff
1996-10-16 0:00 ` Robert Dewar
1996-10-17 0:00 ` Robert A Duff
1996-10-17 0:00 ` Robert Dewar
1996-10-18 0:00 ` Larry Kilgallen
1996-10-18 0:00 ` Robert A Duff
1996-10-18 0:00 ` Norman H. Cohen
1996-10-18 0:00 ` Robert Dewar
1996-10-18 0:00 ` Brian R. Hanson
1996-10-19 0:00 ` Robert Dewar
1996-10-19 0:00 ` Larry Kilgallen
1996-10-22 0:00 ` Once again, Ada absent from DoD SBIR solicitation Dale Stanbrough
1996-10-27 0:00 ` Robert Dewar
1996-10-21 0:00 ` Portability of Arithmetic (was: Java vs Ada 95) Norman H. Cohen
1996-10-21 0:00 ` Robert Dewar
1996-10-21 0:00 ` Lance Kibblewhite
1996-10-21 0:00 ` Norman H. Cohen
1996-10-21 0:00 ` Robert Dewar
1996-10-22 0:00 ` Larry Kilgallen
1996-10-23 0:00 ` Robert Dewar
1996-10-23 0:00 ` Larry Kilgallen
1996-10-23 0:00 ` Norman H. Cohen
1996-10-17 0:00 ` Larry Kilgallen
1996-10-18 0:00 ` Robert A Duff
1996-10-17 0:00 ` Stephen Leake
1996-10-17 0:00 ` Robert A Duff
1996-10-17 0:00 ` Robert Dewar
1996-10-17 0:00 ` Larry Kilgallen
1996-10-18 0:00 ` Robert A Duff
1996-10-17 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Alan Brain
1996-10-17 0:00 ` Robert Dewar
1996-10-17 0:00 ` Robert A Duff
1996-10-18 0:00 ` Keith Thompson
1996-10-20 0:00 ` Alan Brain
1996-10-24 0:00 ` Robert I. Eachus
1996-10-15 0:00 ` Mitch Gart
1996-10-15 0:00 ` Larry Kilgallen
1996-10-15 0:00 ` Mark A Biggar
1996-10-16 0:00 ` Brian Rogoff
1996-10-28 0:00 ` Kenneth Almquist
1996-10-29 0:00 ` Invoking parental methods (was: Java vs Ada 95) Larry Kilgallen
1996-10-31 0:00 ` Kenneth Almquist
1996-10-31 0:00 ` Larry Kilgallen
1996-11-05 0:00 ` Mitch Gart
1996-11-05 0:00 ` Tucker Taft
1996-11-05 0:00 ` Larry Kilgallen
1996-11-06 0:00 ` Robert A Duff
1996-11-06 0:00 ` Larry Kilgallen
1996-11-06 0:00 ` Mitch Gart
1996-11-06 0:00 ` Robert I. Eachus
1996-11-07 0:00 ` David Wheeler
1996-11-08 0:00 ` Jon S Anthony
1996-11-08 0:00 ` Robert I. Eachus
1996-11-05 0:00 ` Larry Kilgallen
1996-11-09 0:00 ` Joel VanLaven
1996-10-16 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Brian Rogoff
1996-10-16 0:00 ` Jon S Anthony
1996-10-16 0:00 ` Brian Rogoff
1996-10-16 0:00 ` Robert Dewar
1996-10-17 0:00 ` Robert A Duff
1996-10-17 0:00 ` Robert Dewar
1996-11-22 0:00 ` Van Snyder
1996-11-25 0:00 ` Java vs Ada vs Inferno, floating point arithmetic Anssi Porttikivi
1996-10-11 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Stephen Leake
1996-10-11 0:00 ` Dave
1996-10-11 0:00 ` Robert Dewar
1996-10-12 0:00 ` Dave
1996-10-12 0:00 ` Robert Dewar
1996-10-14 0:00 ` Keith Thompson
1996-10-18 0:00 ` Why no Propagates? Michel Gauthier
1996-10-22 0:00 ` Richard A. O'Keefe
1996-10-23 0:00 ` Michel Gauthier
1996-10-11 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Mitch Gart
1996-10-11 0:00 ` Jon S Anthony
1996-10-11 0:00 ` Jon S Anthony
1996-10-12 0:00 ` Robert Dewar
1996-10-14 0:00 ` Mitch Gart
1996-10-14 0:00 ` Brian R. Hanson
1996-10-14 0:00 ` Keith Thompson
1996-10-15 0:00 ` Dale Stanbrough
1996-10-15 0:00 ` Brian R. Hanson
1996-10-20 0:00 ` nasser
1996-10-12 0:00 ` davedave
1996-10-12 0:00 ` Robert Dewar
1996-10-16 0:00 ` Jon S Anthony
1996-10-16 0:00 ` Jon S Anthony
1996-10-14 0:00 ` Brian Rogoff
1996-10-14 0:00 ` Jon S Anthony
1996-10-14 0:00 ` Jon S Anthony
1996-10-14 0:00 ` Jon S Anthony
1996-10-14 0:00 ` Jon S Anthony
1996-10-14 0:00 ` Robert Dewar
1996-10-15 0:00 ` Robert A Duff
1996-10-15 0:00 ` Larry Kilgallen
1996-10-16 0:00 ` Lars Farm
1996-10-16 0:00 ` Robert Dewar
1996-10-17 0:00 ` Why no Free? Matthew Heaney
1996-10-18 0:00 ` Robert Dewar
1996-10-18 0:00 ` Robert A Duff
1996-10-18 0:00 ` John Herro
1996-10-19 0:00 ` John Herro
1996-10-15 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Robert I. Eachus
1996-10-15 0:00 ` Robert Dewar
1996-10-15 0:00 ` Robert I. Eachus
1996-10-15 0:00 ` Brian Rogoff
1996-10-16 0:00 ` Jon S Anthony
1996-10-16 0:00 ` Jon S Anthony
1996-10-16 0:00 ` Jon S Anthony
1996-10-16 0:00 ` Samuel T. Harris
1996-10-16 0:00 ` Jon S Anthony
1996-10-18 0:00 ` Keith Thompson
1996-10-16 0:00 ` Jon S Anthony
1996-10-17 0:00 ` Robert Dewar
1996-10-17 0:00 ` Robert Dewar
1996-10-18 0:00 ` Jon S Anthony
1996-10-18 0:00 ` Jon S Anthony
1996-10-18 0:00 ` Jon S Anthony
1996-10-29 0:00 ` Kenneth Almquist
1996-10-29 0:00 ` Robert Dewar
1996-10-31 0:00 ` Kenneth Almquist
1996-10-29 0:00 ` Jon S Anthony
1996-10-29 0:00 ` Robert I. Eachus
1996-10-30 0:00 ` Stephen Leake
1996-10-31 0:00 ` Lars Farm
1996-10-31 0:00 ` Kenneth Almquist
1996-10-31 0:00 ` Jon S Anthony
1996-11-01 0:00 ` Robert I. Eachus
1996-11-01 0:00 ` Robert A Duff
[not found] ` <55gkch$gg6@fozzie.sun3.iaf.nl>
1996-11-03 0:00 ` Robert A Duff
1996-11-03 0:00 ` Robert Dewar
1996-11-04 0:00 ` Larry Kilgallen
1996-11-04 0:00 ` Robert Dewar
1996-11-05 0:00 ` Fast locking (Was Re: Java vs Ada 95) Geert Bosch
1996-11-06 0:00 ` Larry Kilgallen
1996-11-06 0:00 ` Robert Dewar
1996-11-06 0:00 ` Geert Bosch
1996-11-07 0:00 ` Larry Kilgallen
1996-11-07 0:00 ` Robert Dewar
1996-11-11 0:00 ` Norman H. Cohen
1996-11-08 0:00 ` Geert Bosch
1996-11-02 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Robert Dewar
1996-11-04 0:00 ` Robert I. Eachus
1996-11-05 0:00 ` Larry Kilgallen [this message]
1996-11-14 0:00 ` Robert Dewar
1996-11-16 0:00 ` Geert Bosch
1996-11-17 0:00 ` Robert Dewar
1996-11-17 0:00 ` Robert A Duff
1996-11-18 0:00 ` Robert Dewar
1996-11-19 0:00 ` Robert A Duff
1996-11-18 0:00 ` Geert Bosch
1996-11-22 0:00 ` Robert Dewar
1996-11-18 0:00 ` Norman H. Cohen
1996-11-16 0:00 ` Robert A Duff
1996-11-16 0:00 ` Robert Dewar
1996-11-17 0:00 ` Unbounded strings (Was: Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation)) Robert A Duff
1996-11-18 0:00 ` Robert Dewar
1996-11-19 0:00 ` Joel VanLaven
1996-11-23 0:00 ` Robert Dewar
1996-11-19 0:00 ` Robert A Duff
1996-11-23 0:00 ` Robert Dewar
1996-11-24 0:00 ` Robert A Duff
1996-11-25 0:00 ` Norman H. Cohen
1996-11-27 0:00 ` Robert Dewar
1996-11-21 0:00 ` Robert I. Eachus
1996-11-24 0:00 ` Robert Dewar
1996-11-24 0:00 ` Fergus Henderson
1996-11-24 0:00 ` Robert Dewar
1996-11-25 0:00 ` Kevin D. Heatwole
1996-11-25 0:00 ` Robert A Duff
1996-11-26 0:00 ` Kevin D. Heatwole
1996-11-26 0:00 ` Robert A Duff
1996-11-26 0:00 ` Larry Kilgallen
1996-11-27 0:00 ` Norman H. Cohen
1996-11-29 0:00 ` Fergus Henderson
1996-11-29 0:00 ` Robert A Duff
1996-11-27 0:00 ` Robert Dewar
1996-11-26 0:00 ` Geert Bosch
1996-11-26 0:00 ` Robert Dewar
1996-11-25 0:00 ` Robert I. Eachus
1996-11-20 0:00 ` Jon S Anthony
1996-11-24 0:00 ` Robert Dewar
1996-11-06 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Robert I. Eachus
1996-10-11 0:00 ` Ada and the DoD HLA (was: " John Cosby
1996-10-13 0:00 ` Java vs Ada 95 (Was " Hannes Haug
1996-11-03 0:00 ` Hannes Haug
1996-11-06 0:00 ` Fast locking (Was Re: Java vs Ada 95) Hannes Haug
1996-11-06 0:00 ` Hannes Haug
1996-10-11 0:00 ` Once again, Ada absent from DoD SBIR solicitation Matthew M. Lih
1996-10-18 0:00 ` Rush Kester
1996-10-21 0:00 ` C++ Standardization (was: Once again, Ada absent from DoD SBIR solicitation) David Emery
1996-10-10 0:00 ` Jon S Anthony
1996-10-11 0:00 ` Jon S Anthony
1996-10-22 0:00 ` Tarjei Jensen
1996-10-22 0:00 ` C++ Standardization (was: Once again, Ian Ward
1996-11-01 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Jon S Anthony
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