pthreads/pthread_join.c

   1 /* compile with:
   2    gcc pthread_join.c -o pthread_join -lpthread -Wall -W -Wextra -ansi -pedantic */
   3
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <pthread.h>
   7
   8 #define NUM_THREADS 20
   9
  10 /* function prototypes */
  11 void *threadfun(void *arg);
  12 void diep(const char *s);
  13
  14 int main(void)
  15 {
  16     pthread_t tid;
  17     int cnt[NUM_THREADS], i;
  18
  19     for (i = 0; i < NUM_THREADS; i++) {
  20         cnt[i] = i;
  21         printf("Creating thread: %d\n", i);
  22
  23       if (pthread_create(&tid, NULL, threadfun, (void *)&cnt[i]))
  24           diep("pthread_create");
  25
  26       if (pthread_join(tid, NULL))
  27           diep("pthread_join()");
  28     }
  29
  30    return EXIT_SUCCESS;
  31 }
  32
  33 void *threadfun(void *arg)
  34 {
  35     printf("Hello! I am thread: %d\n", *(int *) arg);
  36     pthread_exit(NULL);
  37 }
  38
  39 void diep(const char *s)
  40 {
  41     perror(s);
  42     exit(EXIT_FAILURE);
  43 }