snipplets.dev/code/C/thread.c

/* https://www.geeksforgeeks.org/multithreading-in-c/ */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>

int g = 0;

void *my_thread(void *vargp) {
  int *id = (int *)vargp;

  static int s = 0;

  ++s;
  ++g;

  printf("Thread ID: %d, Static: %d, Global: %d\n", *id, ++s, ++g);
}

int main() {
  pthread_t tid;

  int i;
  for (i = 0; i < 3; i++)
    pthread_create(&tid, NULL, my_thread, (void *)&tid);

  pthread_exit(NULL);

  return 0;
}