_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: NT 4.0 DDK (August 1996) MIPS LIBCNTPR.LIB CodeView type records; _EPROCESS/_ETHREAD offsets match KDEXTMIP.DLL (NT 4.0 Server CD) */