pthreads/pthread_join.c

   1 /*
   2  * Compile with:
   3  * gcc pthread_join.c -o pthread_join -lpthread -Wall -W -Wextra -ansi -pedantic
   4  */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <pthread.h>
   9
  10 #define NUM_THREADS 20
  11
  12 /* function prototypes */
  13 void *threadfun(void *arg);
  14 void diep(const char *s);
  15
  16 int main(void)
  17 {
  18     pthread_t tid;
  19     int cnt[NUM_THREADS], i;
  20
  21     for (i = 0; i < NUM_THREADS; i++) {
  22         cnt[i] = i;
  23         printf("Creating thread: %d\n", i);
  24
  25       if (pthread_create(&tid, NULL, threadfun, (void *)&cnt[i]))
  26           diep("pthread_create");
  27
  28       if (pthread_join(tid, NULL))
  29           diep("pthread_join()");
  30     }
  31
  32    return EXIT_SUCCESS;
  33 }
  34
  35 void *threadfun(void *arg)
  36 {
  37     printf("Hello! I am thread: %d\n", *(int *) arg);
  38     pthread_exit(NULL);
  39 }
  40
  41 void diep(const char *s)
  42 {
  43     perror(s);
  44     exit(EXIT_FAILURE);
  45 }