Fwd: pthread_barrier_wait help

vijay nag vijunag@gmail.com
Sat Aug 17 07:23:00 GMT 2013


On Saturday, August 17, 2013, Jagadish_gmail <jagadishkotra@gmail.com> wrote:
> Hello,
>
>    I have installed glibc using the following command ..
>
>    I have added my new function pthread_barrier_wait_jag()
>
>   bash$pwd
>    /home/jbk5155/glibc/glibc-build/
>  bash$../glibc-2.15/configure --prefix=/home/jbk5155/glibc/glibc-build/ --enable-addon=pthread
>   ......
>   ......
>   .....
>   <configure successful>
>   bash$sudo make
>   <make was successful>
>   bash$sudo make install
>   <make install was successful>
>
>    I see my function being listed with nm command listed below ..
>
>   nm libpthread.so.0 | grep "jag"
>
>     but when I try to compile my testcase with -L/home/jbk5155/glibc/glibc-build/ -lpthread ... testcase compiled successfully but when I do a ldd I still see the default libpthread.so.0 is being picked up
>
> jbk5155@jbk5155:~/splash/codes/kernels/fft$ ldd FFT
>     linux-gate.so.1 =>  (0xb7741000)
>     libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xb7712000)
>     libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xb76e6000)
>     libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xb753b000)
>     /lib/ld-linux.so.2 (0xb7742000)
>
> and hence when I run it my testcase crashes saying pthread_barrier_wait_jag() is not found. Can you please let me know what I am doing wrong?
>
> Thanks and Regards,
> Jagadish.
>
> -------- Original Message --------
> Subject:        pthread_barrier_wait help
> Date:   Wed, 14 Aug 2013 13:49:18 -0700
> From:   Jagadish_gmail <jagadishkotra@gmail.com>
> To:     libc-help@sourceware.org
>
>
>
> Hello,
>
>   I am a graduate student and I am looking for some help with glibc. I
> am working on a project where I am trying to modify
> pthread_barrier_wait.c() code. I see that the hand-optimized
> pthread_barrier_wait.S (assembler version) is currently being used as I
> am on X86 architecture.
>
> I want my build scripts to use the generic pthread_barrier_wait.c
> instead of the hand-optimized pthread_barrier_wait.S.
>
> Can you please let me know what changes do I need to make to use this c
> version of the code instead of the hand-optimized assembler version ?
>
> Thanks and Regards,
> Jagadish
>
>
Try removing absolute path in the  linker script libpthread.so. Ld is
most probably picking library from host machine rather than from your
custom libc ?



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