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Re: [drow@false.org: Re: DB_THREAD support in Berkeley DB/glibc]

To: drow at false dot org
Subject: Re: [drow@false.org: Re: DB_THREAD support in Berkeley DB/glibc]
From: Geoff Keating <geoffk at cygnus dot com>
Date: Wed, 29 Dec 1999 12:26:39 -0800
CC: libc-alpha at sourceware dot cygnus dot com
References: <19991228171708.A19114@drow.res.cmu.edu> <199912282330.PAA08847@localhost.cygnus.com> <19991228212643.A24113@drow.res.cmu.edu>

> Date: Tue, 28 Dec 1999 21:26:43 -0500
> From: Daniel Jacobowitz <drow@false.org>

> > You need MUTEX_ALIGNMENT=32 for powerpc.
> 
> Why?  Will lwarx not work on things only word-aligned?

It will work, but there is a problem if you get two mutexes in the
same cache line.  Reservations are cache-line-based, and it's possible
to get livelock.

-- 
- Geoffrey Keating <geoffk@cygnus.com>

References:
- [drow@false.org: Re: DB_THREAD support in Berkeley DB/glibc]
  - From: Daniel Jacobowitz
- Re: [drow@false.org: Re: DB_THREAD support in Berkeley DB/glibc]
  - From: Geoff Keating
- Re: [drow@false.org: Re: DB_THREAD support in Berkeley DB/glibc]
  - From: Daniel Jacobowitz

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