With glibc-2.1.92-5, getpid() does not return the pid of the process when
called from within a thread.  This problem exists in earlier versions of
glibc as well.
 
I've mentioned it here:
http://sources.redhat.com/ml/libc-alpha/2000-10/msg00081.html
 
Here is a test-case:
 
 
#include "stdlib.h"
#include "pthread.h"
 
void print_message_function (void *ptr);
 
int main (int argc, char **argv)
{
  pthread_t thread1, thread2;
  char *message1 = "Thread 1";
  char *message2 = "Thread 2";
  int status;
 
  pthread_create (&thread1, NULL,
                  (void *) &print_message_function, (void *) message1);
  pthread_create (&thread2, NULL,
                  (void *) &print_message_function, (void *) message2);
 
  pthread_join(thread1, (void **)&status);
  pthread_join(thread2, (void **)&status);
 
  exit (0);
}
 
 
void print_message_function(void *ptr)
{
      int i;
      for(i=0; i < 20; i++)
          printf("%s:  pid: %d\n", ptr, getpid());
 
 }