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 void * process(void * arg)
  11 {
  12   int i;
  13   fprintf(stderr, "Starting process %s\n", (char *) arg);
  14   for (i = 0; i < 10000; i++) {
  15     write(1, (char *) arg, 1);
  16   }
  17   return NULL;
  18 }
  19
  20 int main(void)
  21 {
  22   int retcode;
  23   pthread_t th_a, th_b;
  24   void * retval;
  25
  26   retcode = pthread_create(&th_a, NULL, process, (void *) "a");
  27   if (retcode != 0) fprintf(stderr, "create a failed %d\n", retcode);
  28   retcode = pthread_create(&th_b, NULL, process, (void *) "b");
  29   if (retcode != 0) fprintf(stderr, "create b failed %d\n", retcode);
  30   retcode = pthread_join(th_a, &retval);
  31   if (retcode != 0) fprintf(stderr, "join a failed %d\n", retcode);
  32   retcode = pthread_join(th_b, &retval);
  33   if (retcode != 0) fprintf(stderr, "join b failed %d\n", retcode);
  34   return 0;
  35 }