copy
//0x20 bytes (sizeof)
struct _FAST_MUTEX
{
    LONG Count;                                                             //0x0
    VOID* Owner;                                                            //0x4
    ULONG Contention;                                                       //0x8
    struct _KEVENT Event;                                                   //0xc
    ULONG OldIrql;                                                          //0x1c
};