pthreads/pthread_join.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <pthread.h>
   4
   5 #define NUM_THREADS 20
   6
   7 /* function prototypes */
   8 void *threadfun(void *arg);
   9 void diep(const char *s);
  10
  11 int main(void)
  12 {
  13     pthread_t tid;
  14     int cnt[NUM_THREADS], i;
  15
  16     for (i = 0; i < NUM_THREADS; i++) {
  17         cnt[i] = i;
  18         printf("Creating thread: %d\n", i);
  19
  20       if (pthread_create(&tid, NULL, threadfun, (void *)&cnt[i]))
  21           diep("pthread_create");
  22
  23       if (pthread_join(tid, NULL))
  24           diep("pthread_join()");
  25     }
  26
  27    return EXIT_SUCCESS;
  28 }
  29
  30 void *threadfun(void *arg)
  31 {
  32     printf("Hello! I am thread: %d\n", *(int *) arg);
  33     pthread_exit(NULL);
  34 }
  35
  36 void diep(const char *s)
  37 {
  38     perror(s);
  39     exit(EXIT_FAILURE);
  40 }