#include <boost/thread.hpp>
#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
int rows;
int cols;
int nthreads;
double **a;
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;
	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;
}