#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;
	}
	
}