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

sigset_t signalSet;
pthread_t tids[100];
int n, m, k, licznik;

void *worker(void *arg)
{
	int sigNo;
	int threadNo = *(int*)arg;
	printf("hello world, from worker %d\n",
	       threadNo);
	//pthread_detach(pthread_self());

	while (1) {

		if (sigwait(&signalSet, &sigNo)) {
			perror("sigwait");
			break;
		}
		if(sigNo == 30) break;
		int t = m;
		while(t > 0)
			t = sleep(t);

		fprintf(stderr, "%c", '@' + 1 + threadNo);

		if(++licznik > k) {
			pthread_kill(tids[(threadNo+1)%n], 30);
		} else { pthread_kill(tids[(threadNo+1)%n] , 2); }

	}
	pthread_exit((void *)0);
}

int main(int argc, char *argv[]) {

	if(argc != 4) {
		perror(
	n = atoi(argv[1]);
	m = atoi(argv[2]);
	k = atoi(argv[3]);

	licznik = 0;
	char buf[10];
	int args[100];
	sigfillset(&signalSet);

	pthread_sigmask(SIG_BLOCK, &signalSet, NULL);
	for(int i = 0; i < n; ++i) args[i] = i;
	for(int i = 0; i < n; i++) {
		if (pthread_create(&tids[i], NULL, worker, (void *)(args+i)))
			exit(1);
	}

	while ((n = read(0, buf, sizeof(buf))) > 0) {
		write(1, buf, n);
	}

	return 0;
}