Min version	2003/XP64 SP1	Vista SP1	7	8 Pre RTM	8
Max version	2003/XP64 SP2	Vista SP2	7 SP1		10 TH2
x64 offset offset:bitpos	Field Name
0x0000	long Count	volatile long Count			long Count
0x0008	struct _KTHREAD * Owner			void * Owner
0x0010	unsigned long Contention
0x0018	struct _KEVENT Gate		struct _KEVENT Event
0x0030	unsigned long OldIrql