struct _FAST_MUTEX// Size=0x20
{
    long Count;// Offset=0x0 Size=0x4
    void * Owner;// Offset=0x4 Size=0x4
    unsigned long Contention;// Offset=0x8 Size=0x4
    struct _KEVENT Event;// Offset=0xc Size=0x10
    unsigned long OldIrql;// Offset=0x1c Size=0x4
};