_FAST_MUTEX

Metadatacopy
struct _FAST_MUTEX {
    long Count;/* 0x0  4 */
    struct _KTHREAD* Owner;/* 0x4  4 */
    unsigned long Contention;/* 0x8  4 */
    struct _KEVENT Event;/* 0xc  16 */
    unsigned long OldIrql;/* 0x1c  4 */
};
/* source: Windows 2000 RC2 DDK Alpha libcntpr.lib CodeView type records; build 2128 per the DDK's ntverp.h */