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/* 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);

  else fprintf(stderr, "create a succeeded %d\n", retcode);

  retcode = pthread_create(&th_b, NULL, process, (void *) "b");

  if (retcode != 0) fprintf(stderr, "create b failed %d\n", retcode);

  else fprintf(stderr, "create b succeeded %d\n", retcode);

  retcode = pthread_join(th_a, &retval);

  if (retcode != 0) fprintf(stderr, "join a failed %d\n", retcode);

  else fprintf(stderr, "join a succeeded %d\n", retcode);

  retcode = pthread_join(th_b, &retval);

  if (retcode != 0) fprintf(stderr, "join b failed %d\n", retcode);

  else fprintf(stderr, "join b succeeded %d\n", retcode);

  return 0;

}