linuxthreads/Examples/ex1.c

   1 /* Creates two threads, one printing 10000 "a"s, the other printing
   2    10000 "b"s.
   3    Illustrates: thread creation, thread joining. */
   4
   5 #include <stddef.h>
   6 #include <stdio.h>
   7 #include <unistd.h>
   8 #include "pthread.h"
   9
  10 static void *
  11 process (void *arg)
  12 {
  13   int i;
  14   fprintf (stderr, "Starting process %s\n", (char *) arg);
  15   for (i = 0; i < 10000; i++)
  16     {
  17       write (1, (char *) arg, 1);
  18     }
  19   return NULL;
  20 }
  21
  22 int
  23 main (void)
  24 {
  25   int retcode;
  26   pthread_t th_a, th_b;
  27   void *retval;
  28
  29   retcode = pthread_create (&th_a, NULL, process, (void *) "a");
  30   if (retcode != 0)
  31     fprintf (stderr, "create a failed %d\n", retcode);
  32   retcode = pthread_create (&th_b, NULL, process, (void *) "b");
  33   if (retcode != 0)
  34     fprintf (stderr, "create b failed %d\n", retcode);
  35   retcode = pthread_join (th_a, &retval);
  36   if (retcode != 0)
  37     fprintf (stderr, "join a failed %d\n", retcode);
  38   retcode = pthread_join (th_b, &retval);
  39   if (retcode != 0)
  40     fprintf (stderr, "join b failed %d\n", retcode);
  41   return 0;
  42 }