NPTL - Can't do LD_ASSUME_KERNEL=2.4.x due to missing libs

Question

Some of you may be aware that the jack audio connection kit does not play nicely with the NPTL glibc due to problems setting priorities. A workaround for this is, apparently, to set LD_ASSUME_KERNEL to 2.4.19 before starting jack, to use the old threading system. This doesn't work with arch's NPTL glibc - every program that I try to start after setting this env variable complains of missing libs, like libc.so.6 (I think), so I assume that arch differs from other nptl distros in not including the libraries required. Or something. Is there something I can do about this?

Answer 1

Ok - a glance at the jack-devel archives has solved this for me. Here is a patch I found there that works for me. I called it jacknptl.diff ...
--- client.c.old 2004-04-14 05:38:32.000000000 +0200
+++ client.c 2004-07-18 11:58:36.675323392 +0200
@@ -1342,6 +1342,11 @@
pthread_attr_init (attributes);
+ if (pthread_attr_setinheritsched (attributes, PTHREAD_EXPLICIT_SCHED)) {
+ jack_error ("cannot set inherit attributen");
+ return -1;
+ }
+
if (pthread_attr_setschedpolicy (attributes, SCHED_FIFO)) {
jack_error ("cannot set FIFO scheduling class for RT "
"thread");
And here is a modified PKGBUILD that will build jack with this patch...
# $Id: PKGBUILD,v 1.2 2004/07/13 23:17:44 tobias Exp $
# Maintainer: tobias <[email protected]>
# Contributor: Robert Emil Berge <[email protected]>
pkgname=jack-audio-connection-kit
pkgver=0.98.1
pkgrel=3t1
pkgdesc="a low-latency audio server"
depends=('libsndfile' 'bash')
makedepends=('doxygen')
install=jack-audio-connection-kit.install
url="http://jackit.sourceforge.net/"
backup=(/etc/conf.d/jack-audio-connection-kit)
source=(http://heanet.dl.sourceforge.net/sourceforge/jackit/$pkgname-$pkgver.tar.gz
$pkgname.d $pkgname.conf.d jacknptl.diff )
md5sums=('6ebd659a431e75b841fa5e0c397372ee' '4dcba5381e45bd449def164927854e48'
'0517b67ef912e2a84b6a15dea2dc2680')
build() {
cd $startdir/src/$pkgname-$pkgver/libjack
patch < $startdir/src/jacknptl.diff
cd $startdir/src/$pkgname-$pkgver
./configure --prefix=/usr
make || return 1
make DESTDIR=$startdir/pkg install
install -D -m 755 ../$pkgname.d $startdir/pkg/etc/rc.d/$pkgname
install -D -m 644 ../$pkgname.conf.d $startdir/pkg/etc/conf.d/$pkgname
In case anyone wants that too.