#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <semaphore.h>
#include <time.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <sys/ipc.h>


//n kufli
//kufli < klientow
//kazdy 2l
//losowy czas picia
//po 2 piwach out
//do ost klienta

int n;
int clients;
int t;
sem_t s;

void drink()
{
	for(int i=0; i<2; i++)
	{
		sem_wait(&s);
		printf("Klient nr %d zamawia piwo w kuflu nr %d\n", syscall(SYS_gettid), i);
		int x = rand()%t;
		sleep(x);
		printf("Klient nr %d oddaje kufel nr %d po czasie %d\n", syscall(SYS_gettid), i, x);
		sem_post(&s);
	}
}

int main(int argc, char** argv)
{
	int result;
	pthread_t threads[clients];

	if (argc !=4)
	{
		exit(EXIT_FAILURE);
	}
	srand(time(NULL));

	clients = atoi(argv[1]);
	n = atoi(argv[2]);
	t = atoi(argv[3]);

	sem_init(&s, 0, n);

	for(int i=0; i<clients; i++)
	{
		pthread_create(&threads[i], NULL, drink, NULL);
	}

	for(int j=0; j<clients; j++)
	{
		pthread_join(threads[j], &result);
	}
}