Re: NPTL when dynamically linked linuxthread when statically => How to have NPTL with -static ld flags
At Mon, 11 Oct 2004 15:17:33 +0200,
Eric Valette wrote:
> I'm trying to port a soft RT Posix Application from LynxOS to Linux 2.6.
> Application works great but due to dynamic libraries inefficencies when
> mlockall is used, I need to link statically (For those interested
> reported status VmSize goes from 90 Mb to 35Mb...).
We ship linuxthreads' libpthread.a, but we don't ship nptl's
libpthread.a. So, when you link statically with -lpthread,
linuxthreads' libpthread.a is linked.
We can export both nptl and linuxthreads libpthread.a like
libpthread_nptl.a and libpthread_linuxthreads.a. But I think it's
just debian's local hack - it may be ugly way.
> But I noticed when doing ps ax that in the dynamic case I have a single
> process with 9 threads and in the other case 9 process as if I was using
> Is there anything special to do? Should I open a bug to libc6-dev
Threads of linuxthread are appeared as multiple processes. nptl is
the newer version than linuxthreads. nptl kernel hides such multiple
threads, and threads are appeared as a single process when you execute
ps command. However, note that kernel scheduler handles them as
multiple processes like linuxthreads. It's appearance issue, and it's