#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
struct dane
{
    double *tab, *maksimum;
    int dlugosc;
    pthread_mutex_t *rygiel;
};
typedef struct dane Dane;
void *obsluga(void *x)
{
    Dane *a = (Dane *)x;
    int i;
    double *wynik = (double *)malloc(sizeof(double));
    *wynik = a->tab[0];
    for (i = 1; i < a->dlugosc; i++)
        if (*wynik < a->tab[i])
            *wynik = a->tab[i];
    pthread_mutex_lock(a->rygiel);
    if (*(a->maksimum) < *wynik)
        *(a->maksimum) = *wynik;
    pthread_mutex_unlock(a->rygiel);
    free(a);
    return (void *)wynik;
}
int main(int argc, char **argv)
{
    int m = atoi(argv[1]), n, i, j;
    double **tablica, *pomoc, wynik;
    pthread_t *watki;
    pthread_mutex_t kontrola = PTHREAD_MUTEX_INITIALIZER;
    Dane *y;
    sscanf(argv[2], "%d", &n);
    tablica = (double **)malloc(sizeof(double *) * m);
    watki = (pthread_t *)malloc(sizeof(pthread_t) * m);
    tablica[0] = (double *)malloc(sizeof(double) * m * n);
    for (i = 1; i < m; i++)
        tablica[i] = &(tablica[0][i * n]);
    srand(time(NULL));
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < n; j++)
        {
            tablica[i][j] = (rand() % 1000) / 77;
            printf("[%d][%d]=%lf ", i, j, tablica[i][j]);
        }
        printf("\n");
    }
    wynik = tablica[0][0];
    for (i = 0; i < m; i++)
    {
        y = (Dane *)malloc(sizeof(Dane));
        y->dlugosc = n;
        y->tab = tablica[i];
        y->maksimum = &wynik;
        y->rygiel = &kontrola;
        pthread_create(&(watki[i]), NULL, obsluga, (void *)y);
    }
    for (i = 0; i < m; i++)
    {
        pthread_join(watki[i], (void **)&pomoc);
        free(pomoc);
    }
    printf("Wynik %lf.\n", wynik);
    free(tablica[0]);
    free(watki);
    free(tablica);
    return 0;
}