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