Hi I been working on dxg.sys some time now and documented some behovir,
I started blackbox how DxLock work. it is base on gdi how thing it work, using

same GDIOBJHDR struct. I do not go into detail here we all known who dx is handle in win32k

in xp and higher.

here is the public header of GDIOBJHDR

typedef struct _GDIOBJHDR
{
    HGDIOBJ     hHmgr;
    PVOID       unknownCount;
    ULONG       cExcLock;
    ULONG       Tid;

}GDIOBJHDR, PGDIOBJHDR;

I want change it to

typedef struct _GDIOBJHDR
{
    HGDIOBJ     hHmgr;
    WORD        Count;
    WORD        Type;
    ULONG       cExcLock;
    ULONG       Tid;
}GDIOBJHDR, PGDIOBJHDR;

hHmgr

Handle for this object.

Count
A counter of a kind

Type

which GDI Object type it is

cExcLock

if the object is lock or not

Tid

The Thread it belong to

I hope we can do this change and I want comment and verify from Timo and Jim about this change