VC++ 2008, как задействовать все ядра CPU под расчеты

for(int i=0; i<500; ++i)
{
    __beginthread(SomeFunctionProcessData, 0, param);
}

#include <ctime>
#include <windows.h>
#include <process.h>
#include <iostream>
using namespace std;
 
CRITICAL_SECTION cs;
void thread(PVOID pParam);
int  threadCount = 0;
 
int main()
{
    time_t t;
    char * s;
    InitializeCriticalSection(&cs);
    _beginthread(thread, 0, &threadCount);Sleep(1);threadCount++;
    _beginthread(thread, 0, &threadCount);Sleep(1);threadCount++;
 
    while( threadCount )
    {
        time(&t);
        cout<<asctime(localtime(&t));
        Sleep(1000);
    }
 
    DeleteCriticalSection(&cs);
    cout<<"Bye Bye...";cin.get();
    return 0;
}
 
void thread(PVOID pParam)
{
    int threadNo = ((int *)pParam)[0];
    EnterCriticalSection(&cs);
    cout<<"hread # "<<threadNo<<" started"<<endl;
    LeaveCriticalSection(&cs);
    Sleep(5000);//òóò ïðîïèñûâàåì íàøó job-ó
    EnterCriticalSection(&cs);
    cout<<"hread # "<<threadNo<<" stopped"<<endl;
    threadCount--;
    LeaveCriticalSection(&cs);
}