From: Johannes Stezenbach <js@convergence.de>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: "Gleb O. Raiko" <raiko@niisi.msk.ru>,
"Kevin D. Kissell" <kevink@mips.com>,
linux-mips@linux-mips.org
Subject: Re: Once again: test_and_set for CPUs w/o LL/SC
Date: Thu, 17 Oct 2002 15:11:15 +0200 [thread overview]
Message-ID: <20021017131115.GA1689@convergence.de> (raw)
In-Reply-To: <Pine.GSO.3.96.1021017135738.24495B-100000@delta.ds2.pg.gda.pl>
On Thu, Oct 17, 2002 at 02:02:35PM +0200, Maciej W. Rozycki wrote:
> On Thu, 17 Oct 2002, Gleb O. Raiko wrote:
>
> > Implement new sysmips then.
>
> I'm not sure if that's a good idea. Glibc alone uses test_and_set(),
> exchange_and_add(), atomic_add() and compare_and_swap(). Do you want a
> separate syscall for each of these functions? I think the ll/sc emulation
> may be the best solution after all. At least it's most flexible and not
> much slower if at all.
Depends on your usage pattern. E.g. we don't run software that uses
atomicity.h (i.e. no C++ code), but heavily use pthread_mutex_lock() etc.
The few uses of atomicity.h internal to glibc don't warrant
any optimizations. So, if the beql-Method would not exist, I would
consider implementing a new sysmips for compare_and_swap().
Regards,
Johannes
next prev parent reply other threads:[~2002-10-17 13:11 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-16 16:40 Once again: test_and_set for CPUs w/o LL/SC Johannes Stezenbach
2002-10-07 14:47 ` Johannes Stezenbach
2002-10-07 16:21 ` Kevin D. Kissell
2002-10-07 16:21 ` Kevin D. Kissell
2002-10-07 18:43 ` Johannes Stezenbach
2002-10-07 18:51 ` Daniel Jacobowitz
2002-10-15 17:52 ` Johannes Stezenbach
2002-10-08 7:38 ` Kevin D. Kissell
2002-10-08 7:38 ` Kevin D. Kissell
2002-10-15 15:36 ` Maciej W. Rozycki
2002-10-15 17:21 ` Johannes Stezenbach
2002-10-16 12:20 ` Maciej W. Rozycki
2002-10-16 12:52 ` Johannes Stezenbach
2002-10-16 16:30 ` Johannes Stezenbach
2002-10-17 9:47 ` Gleb O. Raiko
2002-10-17 12:02 ` Maciej W. Rozycki
2002-10-17 13:11 ` Johannes Stezenbach [this message]
2002-10-17 13:32 ` Gleb O. Raiko
2002-10-17 14:13 ` Johannes Stezenbach
2002-10-16 18:11 ` Johannes Stezenbach
2002-10-16 18:23 ` Johannes Stezenbach
2002-10-17 11:57 ` Maciej W. Rozycki
2002-10-17 13:25 ` Johannes Stezenbach
2002-10-15 15:17 ` Maciej W. Rozycki
2002-10-15 16:50 ` Johannes Stezenbach
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