typedef struct _OBJECT_TYPE
{
     ERESOURCE Mutex;
     LIST_ENTRY TypeList;
     UNICODE_STRING Name;
     PVOID DefaultObject;
     ULONG Index;
     ULONG TotalNumberOfObjects;
     ULONG TotalNumberOfHandles;
     ULONG HighWaterNumberOfObjects;
     ULONG HighWaterNumberOfHandles;
     OBJECT_TYPE_INITIALIZER TypeInfo;
     ULONG Key;
     EX_PUSH_LOCK ObjectLocks[32];
} OBJECT_TYPE, *POBJECT_TYPE;

Windows Vista Kernel Structures