pthreads/pthread_create.c

   1 /*
   2  * Compile with:
   3  * gcc pthread_create.c -o pthread_create -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[NUM_THREADS];
  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         if (pthread_create(&tid[i], NULL, threadfun, (void *)&cnt[i]))
  25             diep("pthread_create() error\n");
  26     }
  27
  28     /* Make sure all threads are done */
  29     for (i = 0; i < NUM_THREADS; i++)
  30         if (pthread_join(tid[i], NULL))
  31             diep("pthread_join");
  32
  33     return EXIT_SUCCESS;
  34 }
  35
  36 void *threadfun(void *arg)
  37 {
  38     printf("Hello! I am thread: %d\n", *(int *) arg);
  39     pthread_exit(NULL);
  40 }
  41
  42 void diep(const char *s)
  43 {
  44     perror(s);
  45     exit(EXIT_FAILURE);
  46 }