#include <boost/thread.hpp>
#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;

double *a;
int rows;
int cols;
int nthreads;

void worker(int tid) {
        for (int i=tid;i<rows;i+=nthreads) {
                for (int j=0;j<cols;j++) {
                        a[i*cols+j]=(double) rand()/(RAND_MAX*1.0);
                }
        }

}

int main() {
        srand(time(0));
        rows=10;
        cols=10;
        nthreads=10;
        a=new double[rows*cols];
        boost::thread_group tg;
        for (int t=0;t<nthreads;t++)
                tg.create_thread(boost::bind(worker,t));
        tg.join_all();
        for (int i=0;i<rows;i++) {
                 for(int j=0;j<cols;j++) {
                         cout << a[i*cols+j] <<"";
                 }
                 cout << endl;

}