[ILUG] threads compilation problem

[john carter]

hi
when i compile the file below using gcc abthread.c I get the following type of errors .

/tmp/cc4WfL0U.o(.text+0x6b) undefined reference to pthread_create
/tmp/cc4WfL0U.o(.text+0xd7) undefined reference to pthread_join


any ideas
thanks john 


heres the file

/* Creates two threads, one printing 10000 "a"s, the other printing
   10000 "b"s.
   Illustrates: thread creation, thread joining. */

#include <stddef.h>
#include <stdio.h>
#include <unistd.h>
#include <pthread.h>

void * process(void * arg)
{
  int i;
  fprintf(stderr, "Starting process %s\n", (char *) arg);
  for (i = 0; i < 10000; i++) {
    write(1, (char *) arg, 1);
  }
  return NULL;
}

int main(void)
{
  int retcode;
  pthread_t th_a, th_b;
  void * retval;

  retcode = pthread_create(&th_a, NULL, process, (void *) "a");
  if (retcode != 0) fprintf(stderr, "create a failed %d\n", retcode);
  retcode = pthread_create(&th_b, NULL, process, (void *) "b");
  if (retcode != 0) fprintf(stderr, "create b failed %d\n", retcode);
  retcode = pthread_join(th_a, &retval);
  if (retcode != 0) fprintf(stderr, "join a failed %d\n", retcode);
  retcode = pthread_join(th_b, &retval);
  if (retcode != 0) fprintf(stderr, "join b failed %d\n", retcode);
  return 0;
}



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