From: geert@fozzie.sun3.iaf.nl (Geert Bosch)
Subject: Re: Fast locking (Was Re: Java vs Ada 95)
Date: 1996/11/08
Date: 1996-11-08T00:00:00+00:00 [thread overview]
Message-ID: <55vbnj$o9p@fozzie.sun3.iaf.nl> (raw)
In-Reply-To: 1996Nov7.073254.1@eisner
Larry Kilgallen (kilgallen@eisner.decus.org) wrote:
"Blocking all interrupts" in a multiprocessor environment would be
hazardous to the speed of other, non-interfering, activities.
Please don't twist my words. I specifically said for that this
solution might be good for small/old systems. If you need an example,
think of microcontrollers.
I also wrote:
"Of course machines that do not have any instructions that can be used
to efficiently implement hardware-assisted locking will not have a
test-and-set intrinsic sub-program"
How could you still think I was suggesting that "Blocking all interrupts"
in a multiprocessor environment was a good idea? A multiprocessor system
without test-and-set or similar mechanisms falls into the category:
"[...] of course nobody expects to magically be able to use hardware
locking support when the target platform does not have it. The
point is that *when* it is available, it should be usable in a
consistent way.
Larry wrote:
"My complaint is not that some machines lack fast locking primitives,
but rather that there was an assumption that those primitives will
always be "test and set". "
I never said that, although test-and-set is the most well-known
primitive in this area, so I used that. I even listed some of the
other possible primitives. In any case, the test-and-set operation
can easily be implemented with other fast-locking operations.
And the point is not that these low-level locks should be used in
most applications, but that they can be very valuable tools in
cases where they are needed just like the other parts of Annex C
of the ARM.
Larry wrote:
"DEC designers made the choice that their "load-locked/
store-conditional" semantics would be faster than more traditional
approaches."
If I use that instruction as load-locked/store-whenzero than I have the
equivalent of test-and-set, which is why it makes sense to provide a
very generic fast-locking primitive like test-and-set in Ada
implementations rather than using DECs instruction-of-the-day.
Regards,
Geert
--
E-Mail: geert@sun3.iaf.nl
next prev parent reply other threads:[~1996-11-08 0:00 UTC|newest]
Thread overview: 251+ 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 ` 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 A Duff
1996-10-18 0:00 ` Norman H. Cohen
1996-10-18 0:00 ` Robert Dewar
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 ` 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 ` 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
1996-10-18 0:00 ` Larry Kilgallen
1996-10-18 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 ` 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
1996-10-15 0:00 ` Java vs Ada 95 (Was Re: Once again, Ada absent from DoD SBIR solicitation) Robert Dewar
1996-10-17 0:00 ` 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) 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 ` 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
1996-10-11 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 A Duff
1996-10-18 0:00 ` Robert Dewar
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
1996-10-17 0:00 ` Robert Dewar
1996-10-17 0:00 ` Robert Dewar
1996-10-16 0:00 ` Jon S Anthony
1996-10-18 0:00 ` Keith Thompson
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 ` 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 [this message]
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 ` 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 ` Robert Dewar
1996-11-27 0:00 ` Norman H. Cohen
1996-11-29 0:00 ` Robert A Duff
1996-11-29 0:00 ` Fergus Henderson
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
1996-11-16 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 ` Norman H. Cohen
1996-11-18 0:00 ` Geert Bosch
1996-11-22 0:00 ` Robert Dewar
1996-11-06 0:00 ` 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
-- strict thread matches above, loose matches on Subject: below --
1996-11-12 0:00 Fast locking (Was Re: Java vs Ada 95) Marin David Condic, 561.796.8997, M/S 731-93
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