Исходный код malloc

#include <iostream>
#include <Windows.h>
#include <time.h>
#include <conio.h>
 
using std::cin;
using std::cout;
using std::endl;
 
const int TEST_QUANTITY = 100000;
 
int main()
{
    unsigned int mem_size[TEST_QUANTITY];
    srand( (unsigned int) time( NULL ) );
    for ( int i = 0; i < TEST_QUANTITY; mem_size[i] = rand(), ++i );
    
    int begin_time;
    int end_time;
    int * ptr;
 
    begin_time = GetTickCount();
    for ( int i = 0; i < TEST_QUANTITY; ++i )
    {
        ptr = (int *) malloc( mem_size[i] * 4 );
        free( ptr );
    }
    end_time = GetTickCount();
 
    cout << "Malloc total time: " << end_time - begin_time << endl;
 
    HANDLE hHeap = GetProcessHeap();
 
    begin_time = GetTickCount();
    for ( int i = 0; i < TEST_QUANTITY; ++i )
    {
        ptr = (int *) HeapAlloc( hHeap, 0, mem_size[i] * 4 );
        HeapFree( hHeap, HEAP_NO_SERIALIZE, ptr );
    }
    end_time = GetTickCount();
 
    cout << "HeapAlloc total time: " << end_time - begin_time << endl;
 
    cout << "\nPress any key...";
    _getch();
 
    return 0;
}