systemy

#include <stdlib.h>
#include <iostream>
#include <cstdlib>
#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
#include <errno.h>
#include <cmath>

using namespace std;


void* sinus(void* arg)
{
        double *y = (double*) arg;
        double x = *y;
        double ret = sin(x);
        sleep(pthread_self());
        cout<<"sinx = "<<ret<<endl;
        pthread_exit(0);
        return 0;
}
void* ln(void* arg)
{
        double *y = (double*) arg;
        double x = *y;
        double ret = log(x);
        sleep(pthread_self());
        cout<<"lnx = "<<ret<<endl;
        pthread_exit(0);
        return 0;
}
void* pierw(void* arg)
{
        double *y = (double*) arg;
        double x = *y;
        double ret = sqrt(x);
        sleep(pthread_self());
        cout<<"pierwx = "<<ret<<endl;
        pthread_exit(0);
        return 0;
}

int main(int argc, char **argv)
{
        pthread_t id[2];
        double x = atof(argv[1]);
        double *tab[2];
        double suma;

        if(argc < 2 || x <= 0)
        {
                printf("Nie podano argumentu lub argument nie jest liczba dodatnia\n");
                return 0;
        }
        pthread_create(&id[1], NULL, sinus, &x);
        pthread_create(&id[2], NULL, ln, &x);
        pthread_create(&id[3], NULL, pierw, &x);
        pthread_join(id[1],  (void**)&tab[0]);
        pthread_join(id[2],  (void**)&tab[1]);
        pthread_join(id[3],  (void**)&tab[2]);
        suma = *tab[0] + *tab[1] + *tab[2];
        cout<<"suma: "<<suma<<endl;
        return EXIT_SUCCESS;
}