#include <stdlib.h>
#include <pthread.h>
#include <stdio.h>
#define N 5
#define M 13
#define SLEEP 4
pthread_mutex_t mut, mutcond;
pthread_cond_t cond;
int linie[N], tren[M];
pthread_t tid[M];
int liniilibere;

//rutina unui thread
void* trece(void* tren) {
    int i, s, t, l;
    t = *(int*)tren;
    s = 1 + rand() % SLEEP; // Modificati timpii de stationare
    
    pthread_mutex_lock(&mutcond);
    for ( ; liniilibere == 0; ) {
        pthread_cond_wait(&cond, &mutcond);
    }
    pthread_mutex_unlock(&mutcond);
    
    pthread_mutex_lock(&mut);
    for (l = 0; l < N; l++)
        if (linie[l] == -1) break;
    linie[l] = t;
    liniilibere--;
    printf("Trenul %d pe linia %d pentru %d secunde. Trenuri in gara:", t, l, s);
    for (i=0; i< N; i++)
        if (linie[i] != -1)
            printf(" %d",linie[i]);
    printf(".\n");
    fflush(stdout);
    pthread_mutex_unlock(&mut);

    sleep(s); // Modificati timpii de sleep

    pthread_mutex_lock(&mut);
    linie[l] = -1;
    liniilibere++;
    pthread_mutex_unlock(&mut);
    
    pthread_mutex_lock(&mutcond);
    pthread_cond_signal(&cond);
    pthread_mutex_unlock(&mutcond);
}

//main
main(int argc, char* argv[]) {
    int i;
    pthread_mutex_init(&mut, NULL);
    pthread_mutex_init(&mutcond, NULL);
    pthread_cond_init(&cond, NULL);
    liniilibere = N;
    for (i = 0; i < N; linie[i] = -1, i++);
    for (i=0; i < M; tren[i] = i, i++);
    
    // ce credeti despre ultimul parametru &i?
    for (i=0; i < M; i++) pthread_create(&tid[i], NULL, trece, &tren[i]);
    for (i=0; i < M; i++) pthread_join(tid[i], NULL);
    
    pthread_mutex_destroy(&mut);
    pthread_mutex_destroy(&mutcond);
    pthread_cond_destroy(&cond);
}