Hm. indeed, I see this too.
Most likely, helgrind lacks a proper suppression.
Julian,
I can see this suppression:
{
helgrind-glibc2X-102
Helgrind:Race
fun:mythread_wrapper
obj:/lib*/libpthread-2.*so*
}
but it doesn't match because for some reason the stack contains just one
frame.
--kcc
2010/9/8 Ivan S. Lyapunov <[email protected]>
> В Wed, 8 Sep 2010 17:12:46 +0400
> Konstantin Serebryany <[email protected]> пишет:
>
> It still the same.
>
> gcc ./main.cpp -o main -g -pthread -D_REENTRANT -D_THREAD_SAFE -lpthread
>
> Regards,
> Ivan
>
> ==12972== Thread #1 is the program's root thread
> ==12972==
> ==12972== Thread #2 was created
> ==12972== at 0x41371F8: clone (in /lib/libc-2.12.1.so)
> ==12972== by 0x4054425: pthread_create@@GLIBC_2.1 (in /lib/
> libpthread-2.12.1.so)
> ==12972== by 0x40251E1: pthread_create_WRK (in
> /usr/lib/valgrind/vgpreload_helgrind-x86-linux.so)
> ==12972== by 0x80484D9: main (main.cpp:84)
> ==12972==
> ==12972== Possible data race during read of size 4 at 0xbecc119c by thread
> #1
> ==12972== at 0x40251FD: pthread_create_WRK (in
> /usr/lib/valgrind/vgpreload_helgrind-x86-linux.so)
> ==12972== by 0x80484D9: main (main.cpp:84)
> ==12972== This conflicts with a previous write of size 4 by thread #2
> ==12972== at 0x40252C9: mythread_wrapper (in
> /usr/lib/valgrind/vgpreload_helgrind-x86-linux.so)
> ==12972== by 0x4053E5F: start_thread (in /lib/libpthread-2.12.1.so)
> ==12972== by 0x413720D: clone (in /lib/libc-2.12.1.so)
> ==12972==
> tra-la-la
>
>
> > On Wed, Sep 8, 2010 at 5:02 PM, Ivan S. Lyapunov <[email protected]>
> > wrote:
> >
> > > Hello.
> > >
> > > I'm writed a simple pthreads program and can't understand Valgrind
> > > output because thre is no error in my case I think ;)
> > >
> > > #include <stdio.h>
> > > #include <stdlib.h>
> > > #include <unistd.h>
> > > #include <pthread.h>
> > >
> > > extern "C" {
> > >
> > > void * run_handle(void * param) {
> > > printf("tra-la-la\n");
> > > return 0;
> > > }
> > > }
> > >
> > > int main(int argc, char** argv) {
> > > pthread_t t;
> > > pthread_create(&t, 0, run_handle, 0);
> > >
> > > sleep(10);
> > > return 0;
> > > }
> > >
> > >
> > > compile it
> > > gcc ./main.cpp -o main -pthread -D_REENTRANT -D_THREAD_SAFE
> > > -lpthread
> > >
> >
> > As the first step, try adding "-g" to the compile command.
> >
> > --kcc
> >
> >
>
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