#define _GNU_SOURCE

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

void *start_routine(void *arg) {
	char msg[32] = "";
	snprintf(msg, sizeof(msg)-1, "thd%d: i am thd%d\n", *((int *)arg), *((int *)arg));
	while (1) {
		write(1, msg, strlen(msg));
		sleep(1);
	}
}

int main() {

	int th1 = 1;
	pthread_t tid1;
	pthread_create(&tid1, NULL, start_routine, &th1);

	int th2 = 2;
	pthread_t tid2;
	pthread_create(&tid2, NULL, start_routine, &th2);
	
	int th3 = 3;
	pthread_t tid3;
	pthread_create(&tid3, NULL, start_routine, &th3);

	const char *msg = "main: i am main\n";
	while (1) {
		write(1, msg, strlen(msg));
		sleep(1);
	}

	return 0;
}