From: "Norman H. Cohen" <ncohen@watson.ibm.com>
Subject: Re: Fast locking (Was Re: Java vs Ada 95)
Date: 1996/11/11
Date: 1996-11-11T00:00:00+00:00 [thread overview]
Message-ID: <32877756.47F1@watson.ibm.com> (raw)
In-Reply-To: dewar.847398083@merv
Robert Dewar wrote:
>
> Geert says
>
> "> I can't imagine there are many systems around these days that do not
> > provide efficient test-and-set semantics.
...
>
> Your imagination is deficient. Examples are the RS6000 and all earlier
> MIPS chips. There are others!
The RS6000 is not a processor, but a family of systems, early versions
of which were based on the POWER architecture and later versions of
which were based on the PowerPC architecture. Robert is presumably
referring to the POWER architecture, which did not include
syncrhonization operations for shared-memory multiprocessors. In
contrast, the PowerPC architecture provides the lwarx (load word
arithmetic and reserve, indexed) and stwcx (store word conditional,
indexed) instructions, which provide powerful and efficient
syncrhonization. Every PowerPC architecture document I have seen
includes an appendix with syncrhonization programming examples, showing
how a handful of instructions, generally built around a lwarx/stwcx
pair, can be used to program such syncrhonization idioms as
Fetch-and-Store, Fetch-and-Add, Test-and-Set, Compare-and-Swap, and
lock/unlock.
(My favorite PowerPC syncrhonization instruction, used to ensure that
out-of-order loads and stores do not violate the semantics of volatile
variables and memory-mapped I/O ports, is Enforce In-Order Execution of
I/O. Its mnemonic is, naturally, eieio.)
--
Norman H. Cohen
mailto:ncohen@watson.ibm.com
http://www.research.ibm.com/people/n/ncohen
next prev parent reply other threads:[~1996-11-11 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 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 ` 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 ` Robert Dewar
1996-10-17 0:00 ` Larry Kilgallen
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 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 ` 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) 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) 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
1996-10-12 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 ` John Herro
1996-10-19 0:00 ` John Herro
1996-10-18 0:00 ` Robert Dewar
1996-10-18 0:00 ` Robert A Duff
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 ` Robert I. Eachus
1996-10-29 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
1996-10-30 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 [this message]
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 ` 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 ` 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 ` Robert Dewar
1996-11-27 0:00 ` Norman H. Cohen
1996-11-29 0:00 ` Fergus Henderson
1996-11-29 0:00 ` Robert A Duff
1996-11-26 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
1996-10-10 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
1996-10-11 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 --
1996-11-12 0:00 Fast locking (Was Re: Java vs Ada 95) Marin David Condic, 561.796.8997, M/S 731-93
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox