Re: [patch] futex patches, futex-2.5.69-A2

Martin Schlemmer (azarah@gentoo.org)
21 May 2003 07:06:57 +0200

On Tue, 2003-05-20 at 21:55, Christoph Hellwig wrote:
> On Tue, May 20, 2003 at 06:02:07PM +0200, Ingo Molnar wrote:
> > you havent ever used Ulrich's nptl-enabled glibc, have you? It will boot
> > on any 2.4.1+ kernel, with and without nptl/tls support. It switches the
> > threading implementation depending on the kernel features it detects.
>
> I have built a nptl-enabled glibc and no, it's doesn't work on 2.4 at all.
>

It is because you only compiled it with nptl support.

In recent (nptl enabled) Redhat glibc's glibc is build two times.
1) without nptl
2) with nptl

The version without nptl support is then installed into the 'default'
location. The other is installed into /lib/tls/ and /usr/lib/tls/.
ld.so is then hacked (maybe in mainline glibc now?) to load the tls
enabled versions of the libraries only if the kernel/hardware support
it.

Regards,

-- 
Martin Schlemmer




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