#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;
	  	//me afta to kano seiriako, diladi trexei mono 1 th fora
	  	//rand_mtx.lock();
	  //	value=(double)rand()/(RAND_MAX*1.0);
	  	//rand_mtx.unlock();
	  	//a[i][j]=value;
	  	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;
	}