pthreads/pthread_create.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[NUM_THREADS];
  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         if (pthread_create(&tid[i], NULL, threadfun, (void *)&cnt[i]))
  20             diep("pthread_create() error\n");
  21     }
  22
  23     /* make sure all threads are done */
  24     for (i = 0; i < NUM_THREADS; i++)
  25         if (pthread_join(tid[i], NULL))
  26             perror("pthread_join");
  27
  28     return EXIT_SUCCESS;
  29 }
  30
  31 void *threadfun(void *arg)
  32 {
  33     printf("Hello! I am thread: %d\n", *(int *) arg);
  34     pthread_exit(NULL);
  35 }
  36
  37 void diep(const char *s)
  38 {
  39     perror(s);
  40     exit(EXIT_FAILURE);
  41 }