comp.lang.ada
 help / color / mirror / Atom feed
From: geert@fozzie.sun3.iaf.nl (Geert Bosch)
Subject: Re: Unbounded strings (Was: Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation))
Date: 1996/11/26
Date: 1996-11-26T00:00:00+00:00	[thread overview]
Message-ID: <57dd70$1pf@fozzie.sun3.iaf.nl> (raw)
In-Reply-To: heatwole-ya023180002511960851580001@news.his.com


Kevin D. Heatwole (heatwole@his.com) wrote:
 ``Is it really that much harder to provide an efficient ref-counted
   tasking safe implementation of unbounded strings than it is to
   provide an efficient tasking safe allocator? ''

No, it isn't. The only problems relate to the priority requirements of
Annex D.  When you want to use ceiling priority locks, it is necessary
to change and/or check priority of tasks which requires an expensive
system call.

As far as I'm concerned it is acceptable to have an implementation that
locks a reference counter, updates the count and unlocks it without any
priority checking, since the circumstances in which starvation of a
higher priority task occurs, because a lower-priority task has the lock
are very rare and the effects are much less disastrous then the
erroneous behavior of reference counts without locks. Also, raising an
exception in such cases is not too difficult to implement.

The problems related to implementing a locking scheme with such very
specific real-time behaviour as described by Annex D. should not be
an excuse to use no locks at all.

Regards,
   Geert
-- 
E-Mail: geert@sun3.iaf.nl    




  parent reply	other threads:[~1996-11-26  0:00 UTC|newest]

Thread overview: 252+ 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                   ` Shayne Flint
1996-10-22  0:00                     ` Robert A Duff
1996-10-22  0:00                   ` Ken Garlington
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 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           ` 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
1996-10-11  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 Dewar
1996-10-18  0:00                   ` Norman H. Cohen
1996-10-18  0:00                     ` Robert Dewar
1996-10-18  0:00                   ` Robert A Duff
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                         ` Larry Kilgallen
1996-10-18  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                               ` 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
1996-10-21  0:00                               ` Lance Kibblewhite
1996-10-17  0:00                     ` Stephen Leake
1996-10-17  0:00                       ` Robert A Duff
1996-10-17  0:00                         ` Larry Kilgallen
1996-10-18  0:00                           ` Robert A Duff
1996-10-17  0:00                         ` Robert Dewar
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 A Duff
1996-10-17  0:00                   ` Robert Dewar
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                             ` Robert I. Eachus
1996-11-08  0:00                             ` Jon S Anthony
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) Robert Dewar
1996-10-12  0:00             ` davedave
1996-10-12  0:00               ` Robert Dewar
1996-10-13  0:00               ` Larry Kilgallen
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
1996-10-12  0:00         ` Robert Dewar
1996-10-14  0:00           ` Brian R. Hanson
1996-10-14  0:00           ` Mitch Gart
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
1996-10-11  0:00       ` Jon S Anthony
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       ` 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
1996-10-14  0:00       ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Jon S Anthony
1996-10-14  0:00       ` Brian Rogoff
1996-10-15  0:00       ` Robert I. Eachus
1996-10-15  0:00       ` Brian Rogoff
1996-10-15  0:00       ` Robert I. Eachus
1996-10-15  0:00         ` Robert Dewar
1996-10-16  0:00       ` Jon S Anthony
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
1996-10-16  0:00       ` Samuel T. Harris
1996-10-16  0:00       ` Jon S Anthony
1996-10-16  0:00       ` Jon S Anthony
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       ` Jon S Anthony
1996-10-29  0:00       ` Robert I. Eachus
1996-10-29  0:00       ` Kenneth Almquist
1996-10-29  0:00         ` Robert Dewar
1996-10-31  0:00           ` Kenneth Almquist
1996-10-30  0:00       ` Stephen Leake
1996-10-31  0:00         ` Lars Farm
1996-10-31  0:00       ` Jon S Anthony
1996-10-31  0:00       ` Kenneth Almquist
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                     ` 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
1996-11-06  0:00                     ` Robert Dewar
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
1996-11-14  0:00           ` Robert Dewar
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                     ` 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
1996-11-19  0:00                     ` Joel VanLaven
1996-11-23  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 [this message]
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
1996-11-16  0:00             ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) 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
1996-11-06  0:00         ` Robert I. Eachus
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           ` Robert Dewar
1996-10-14  0:00             ` Mitch Gart
1996-10-14  0:00               ` Ken Garlington
1996-10-11  0:00           ` Ken Garlington
1996-10-14  0:00           ` Norman H. Cohen
1996-10-14  0:00             ` Bevin R. Brett
1996-10-11  0:00     ` Ada and the DoD HLA (was: Once again, Ada absent from DoD SBIR solicitation) 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
  -- strict thread matches above, loose matches on Subject: below --
1996-11-25  0:00 Unbounded strings (Was: Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation)) Franco Mazzanti
1996-11-25  0:00 ` Robert A Duff
replies disabled

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox