#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;
	}
	return 0;
}