37   int retcode;  in main()  local
41   retcode = pthread_create (&th_a, NULL, process, (void *) "a");  in main()
42   if (retcode != 0)  in main()
43     fprintf (stderr, "create a failed %d\n", retcode);  in main()
44   retcode = pthread_create (&th_b, NULL, process, (void *) "b");  in main()
45   if (retcode != 0)  in main()
46     fprintf (stderr, "create b failed %d\n", retcode);  in main()
47   retcode = pthread_join (th_a, &retval);  in main()
48   if (retcode != 0)  in main()
49     fprintf (stderr, "join a failed %d\n", retcode);  in main()
50   retcode = pthread_join (th_b, &retval);  in main()
51   if (retcode != 0)  in main()
52     fprintf (stderr, "join b failed %d\n", retcode);  in main()