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Re: NPTL for hppa-linux is not backwards compatible with Linuxthreads.

From: Mike Frysinger <vapier at gentoo dot org>
To: Roland McGrath <roland at redhat dot com>
Cc: "Carlos O'Donell" <carlos at systemhalted dot org>, debian-glibc at lists dot debian dot org, parisc-linux <parisc-linux at lists dot parisc-linux dot org>, "Jeff Bailey" <jbailey at raspberryginger dot com>, "Aurelien Jarno" <aurel32 at debian dot org>, "Guy Martin" <gmsoft at gentoo dot org>, libc-ports at sourceware dot org
Date: Fri, 23 Feb 2007 06:46:22 -0500
Subject: Re: NPTL for hppa-linux is not backwards compatible with Linuxthreads.
Organization: wh0rd.org
References: <20070223024202.1175E1800E4@magilla.sf.frob.com>

On Thursday 22 February 2007, Roland McGrath wrote:
> > All statically initialized locks are broken. We made locks smaller,
> > and changed the value of the static initialization.
>
> Smaller?  Smaller is easy.  And you didn't actually reduce
> __SIZEOF_PTHREAD_MUTEX_T, did you?  This seems like it would not be at all
> hard to accommodate just with symbol versioning and not break any
> compatibility.  Off hand, it seems like it would be some simple code in one
> new file in your sysdeps/ tree and a smattering of sysdeps Versions files.

how can you do symbol versioning on static initializers ?  the initialized 
value is compiled into the .data sections of the actual binary ...

hmm ... do you mean we retain the pthread code that uses the old locking 
methods and create all the new code with glibc-2.6 symbol versions ?
-mike

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References:
- Re: NPTL for hppa-linux is not backwards compatible with Linuxthreads.
  - From: Roland McGrath

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