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

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

boost::mutex rand_mtx;

void worker(int tid){
	for (int i=tid;i<rows;i+=nthreads){
		for(int j=0;j<cols;j++){
			double value;
//			rand_mtx.lock();
//			value=(double) rand()/(RAND_MAX *1.0);
//			rand_mtx.unlock();
			a[i][j]=(double) rand()/(RAND_MAX*1.0);
		}
	}
}
int main() {
	srand(time(0));
	rows=1000;
	cols=1000000;
	nthreads=100; //1+rand()%6;
	//double **a;
	a= new double*[rows];
	for(int i=0;i<rows;i++) {
		a[i]=new double[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][j] << " ";
		}
		cout <<endl;
	}
*/
	return 0;

}