From: David Edelsohn <dje@watson.ibm.com>
To: Geoff Keating <geoffk@cygnus.com>
Cc: eek@escape.ca, drow@false.org, linuxppc-dev@lists.linuxppc.org,
libc-alpha@sourceware.cygnus.com
Subject: Re: DB_THREAD support in Berkeley DB/glibc
Date: Tue, 28 Dec 1999 20:01:40 -0500 [thread overview]
Message-ID: <199912290101.UAA23618@mal-ach.watson.ibm.com> (raw)
In-Reply-To: Message from Geoff Keating <geoffk@cygnus.com> of "Tue, 28 Dec 1999 16:54:38 PST." <199912290054.QAA13250@localhost.cygnus.com>
>>>>> Geoff Keating writes:
>> If you only are using the TSL_UNSET in the context that one
>> already has the lock, then the lwarx/stwcx are unnecessary. What you have
>> written, however, is not a general atomic clear macro.
Geoff> How is it not atomic?
If this thread is the only one that can clear the cell, I think
that it is okay. The store to acquire the lock also is atomic, but one
cannot simply store the value. If the programming model allows contention
when clearing the word, one needs to use the lwarx/stwcx instructions.
David
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~1999-12-29 1:01 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
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 [this message]
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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