systemy2

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

using namespace std;

double tab[3];
void* sinus(void* arg)
{
        double *y = (double*) arg;
        double x = *y;
        double ret = sin(x);
        tab[0]=ret;
        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);
        tab[1]=ret;
        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());
        tab[2]=ret;
        cout<<"pierwx = "<<ret<<endl;
        pthread_exit(0);
        return 0;
}

int main(int argc, char **argv)
{
        pthread_t id[3];
        double suma=0;

        double x=0;

        if(argc < 2 || (x=atof(argv[1])) <= 0)
        {
                cout<<"Blad"<<endl;
                return 0;
        }
        pthread_create(&id[0], NULL, sinus, &x);
        pthread_create(&id[1], NULL, ln, &x);
        pthread_create(&id[2], NULL, pierw, &x);
        pthread_join(id[0],  NULL);
        pthread_join(id[1],  NULL);
        pthread_join(id[2],  NULL);
        suma = tab[0] + tab[1] + tab[2];
        cout<<"suma: "<<suma<<endl;
        return 0;
}