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

int thread_counter;

void process_signal_handler(int signum) {

	// printf("[signal handler] ALARM\n");

	printf("[signal handler] thread id = %ld\n", pthread_self());

	thread_counter++;
}


void * thread_entry_point(void * arg) {

	printf("[t1] thread id = %ld\n", pthread_self());

	while (1) {

		if (thread_counter >= 10)
			break;

	}

	printf("[t1] bye\n");

	pthread_exit(NULL);

}


int main() {

	printf("imposto il gestore di segnali\n");
	if (signal(SIGUSR1, process_signal_handler) == SIG_ERR) {
		perror("signal");
		exit(1);
	}

	printf("[main thread] thread id = %ld\n", pthread_self());

	pthread_t t1;
	int res;

	res = pthread_create(&t1, NULL, thread_entry_point, NULL);
	if (res != 0) {
		perror("pthread_create");
		exit(1);
	}

	for (int i = 0; i < 10; i++) {
		printf("%d...\n", i);
		sleep(1);

		if (pthread_kill(t1, SIGUSR1) != 0) {
			perror("pthread_kill");
		}
	}

	sleep(1);

	printf("[main thread] bye\n");

	return 0;
}