M. Koehrer wrote: > Hi Jan, > > I found out, that is issue seems to be related to the NPTL (native posix > thread library). > The pthread library in use was > /lib/tls/i686/cmov/libpthread.so.0 > which is part of the Debian (testing) package libc6-i686. > (see http://packages.debian.org/testing/libs/libc6-i686) > > When renaming the lib/tls to lib/tls.disabled the pthread library in use is > /lib/libpthread.so.0 > and then it is working perfectly!
...which does not yet explain WHY the other scenario fails. > > It seems that the i686 optimized libc is not fully compatible with Xenomai. That's not true in such a common form. We are using NTPL libs for i586 and i686 (SuSE builds) without /general/ issues. Still, specific problems like this may sleep somewhere. > I read about this library at Romain Lenglet's web page: > http://www.csg.is.titech.ac.jp/~lenglet/howtos/realtimelinuxhowto/index.html > I think this library uses the NPTL (Native Posix Thread Lib). > The i686 optimized library shows the value > NPTL 2.3.6 > at > getconf GNU_LIBPTHREAD_VERSION > The "old" pthread lib shows the value: > linuxthreads-0.10 > > Now, I tried to reconfigure Xenomai with --enable-x86-sep to use > the NPTL but this did not help either. That only influences the way syscalls are passed down into the kernel. > When I rename now /lib/tls to /lib/tls.disabled, the application complains > about the missing NPTL support in the library. > Well, I have now a solution that works: > I can use the standard pthread lib and not the i686 optimized NPTL. > However, as NPTL seems to be a performance benefit, I think it could be > worth to get this combination up and running. > > Is there anybody out there that uses a Debian based system with the i686 > optimized libc that works perfectly? > > BTW: I am using xenomai 2.2.4 from end of October. > Again my question: is the issue SMP related? Reproducing your problem over a qemu box (with or without SMP) failed so far for me. But I'm not on your glibc. Jan
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