Re: [Valgrind-users] Need a configure check for NPTL

[Biswapesh C. <bis...@tc...>]

IIRC, the wine folks have a reasonable configure time check for NPTL in
CVS, so maybe you can simply swipe their code ?

Of course, the issue they are facing is that what if the program
(wine/valgrind) is compiled with one kind of threading support and the
binary shipped to a system with a different type of threading ?
Basically, in that case, you need a runtime check as well.

> On Sunday 06 April 2003 6:48 pm, Robert Walsh wrote:
> > > Anyone have a reliable check easily to hand?
> >
> > Yeugh.  I don't know if this is reliable, but pthread_tryjoin_np is
> > implemented in nptl but not in the original pthread stuff.  Perhaps a
> > check for that will let you know?  It will certainly let you know if
> > pthread_tryjoin_np is implemented, but you might allow yourself to infer
> > from that that it's nptl... :-)
> 
> Hmm.  Sounds a plausible scheme, but ...
> 
> On the one hand (on RH 9),   nm /lib/tls/libpthread.so.0 | grep tryjoin
> shows pthread_tryjoin_np as an exported text symbol ("T").
> 
> On the other hand, you can't link against it:
> 
>    sewardj@localhost:~/VgHEAD/valgrind$ cat nptltest.c
> 
>    #include <pthread.h>
>    extern int pthread_tryjoin_np;
>    int main (int argc, char * argv )
>    {
>       int* p = (int*)(& pthread_tryjoin_np);
>       return 0;
>    }
> 
>    sewardj@localhost:~/VgHEAD/valgrind$ gcc -o nptltest nptltest.c
>    -lpthread
>    /tmp/ccWjnvw9.o(.text+0x13): In function `main':
>    : undefined reference to `pthread_tryjoin_np'
>    collect2: ld returned 1 exit status
> 
> Now what?  If the symbol is in the DSO, why can't I link to it?
> Mystified.
> 
> J
> 
> 
> 
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-- 
Biswa.