From: BenH <bh40@calva.net>
To: David Edelsohn <dje@watson.ibm.com>,
dhd@debian.org, linuxppc-dev@lists.linuxppc.org
Subject: Re: DB_THREAD support in Berkeley DB/glibc
Date: Tue, 28 Dec 1999 22:22:29 +0100 [thread overview]
Message-ID: <19991228222229.008118@smtp.calvacom.fr> (raw)
In-Reply-To: <199912281902.OAA25964@mal-ach.watson.ibm.com>
On Tue, Dec 28, 1999, David Edelsohn <dje@watson.ibm.com> wrote:
> The TSL_SET macro is basically correct for PowerPC uniprocessor,
>but it is not MP safe. For cases where this needs to be safe across a
>multiprocessor complex, it should be preceded by a "sync" instruction and
>ended with an "isync" instruction, or something similar depending on the
>semantics one uses for accessing the word.
Also, according to some Moto writing I read some time ago, the
reservation should be cleared in both the good case and the fail case.
Basically, once the lwarx was done, the stwcx. should be done even if
results don't match. The suggested implementation, if I recall correctly,
is to first do a normal load and compare, and if it matches, then enter
the lwarx/stwcx. pair.
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~1999-12-28 21:22 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-12-27 3:04 DB_THREAD support in Berkeley DB/glibc Troy Benjegerdes
1999-12-28 7:59 ` Daniel Jacobowitz
1999-12-28 17:53 ` Joel Klecker
1999-12-28 19:02 ` David Edelsohn
1999-12-28 21:22 ` BenH [this message]
1999-12-28 22:05 ` Daniel Jacobowitz
1999-12-28 22:28 ` David Edelsohn
1999-12-28 23:21 ` Tony Mantler
1999-12-29 0:15 ` David Edelsohn
1999-12-29 0:54 ` Geoff Keating
1999-12-29 1:01 ` David Edelsohn
1999-12-28 23:52 ` Geoff Keating
1999-12-29 0:21 ` David Edelsohn
-- strict thread matches above, loose matches on Subject: below --
1999-05-10 23:59 imac of booting Ben Martz
1999-05-11 8:36 ` Joel Klecker
1999-05-11 15:22 ` David Edelsohn
1999-05-11 16:47 ` Geert Uytterhoeven
1999-05-11 17:44 ` Anyone playing with Darwin 0.2 binary yet? Kevin B. Hendricks
1999-05-11 18:47 ` Nathan Ingersoll
1999-05-11 21:00 ` Roger Ivie
1999-05-11 22:15 ` David A. Gatwood
[not found] ` <v04011701b35e71c158ed@[199.174.98.46]>
1999-05-12 14:50 ` New PPC/Mac features of 2.2.8? Jason Haas
1999-05-12 18:21 ` Matt Porter
1999-05-12 19:41 ` Tom Rini
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