good random function

static GList *playlist_shuffle_list(GList *list)
{
	/* Caller should holde playlist mutex */
	/*
	 * Note that this doesn't make a copy of the original list.
	 * The pointer to the original list is not valid after this
	 * fuction is run.
	 */
	gint len = g_list_length(list);
	gint i, j;
	GList *node, **ptrs;

	if (!len)
		return NULL;

	ptrs = g_new(GList *, len);

	for (node = list, i = 0; i < len; node = g_list_next(node), i++)
		ptrs[i] = node;

	j = random() % len;
	list = ptrs[j];
	ptrs[j]->next = NULL;
	ptrs[j] = ptrs[0];

	for (i = 1; i < len; i++)
	{
		j = random() % (len - i);
		list->prev = ptrs[i + j];
		ptrs[i + j]->next = list;
		list = ptrs[i + j];
		ptrs[i + j] = ptrs[i];
	}
	list->prev = NULL;

	g_free(ptrs);

	return list;
}

case WM_LBUTTONDOWN :
       // x = LOWORD (lParam);
       // y = HIWORD (lParam)
       // wParam: shift, ctrl key and button flags

	   tic1 = GetTickCount();
	   x = LOWORD (lParam);
	   y = HIWORD (lParam);
       InvalidateRect (hWnd, NULL, TRUE);
       return 0;

  case WM_LBUTTONUP:
	   
	   tic2 = GetTickCount();
	   x1 = LOWORD (lParam);
	   y1 = HIWORD (lParam);
	   
	   ticR = (tic2 - tic1)/100;
	   
	   dist = 1000 * sqrt((pow((y-y1),2)) + (pow((x - x1),2))); 
	
	   if(ticR!=0)
		result = dist/ticR;
	   sprintf(txt,"The velocity was %u ", result);
	   text = txt;  

	   MessageBox(hWnd,text,"dist",MB_OK);

	   InvalidateRect (hWnd, NULL, TRUE);
       return 0;

#include <time.h>
#include <sys/time.h>

unsigned long int next=1;

short int k=1;

int myrand(int a, int b)
{
        struct timeval t1;

        int temp;

        gettimeofday(&t1,NULL);

        if(k>5)
        {
                k=1;
                next=1;
        }

        next= (next * t1.tv_usec * t1.tv_usec) + (t1.tv_sec/100);

        k++;

        if(t1.tv_usec==0)
                temp=1;
        else
                temp=t1.tv_usec;

        return (unsigned int) (((next/temp)%b)+a);
}