def __init__(self):
        vstruct.VStruct.__init__(self)
        self.Lock = v_uint32()
        self.BitmapRanges = v_ptr32()
        self.RangeArrayCommitStatus = RTL_BITMAP()
        self.AllocateRoutine = v_ptr32()
        self.FreeRoutine = v_ptr32()
        self.RangeCount = v_uint32()
        self.RangeIndexLimit = v_uint32()
        self.BitsPerRange = v_uint32()
        self.RangeCountMax = v_uint32()
        self.RangeMetadataOffset = v_uint32()
        self.MetadataSizePerBit = v_uint32()
        self.DefaultBitsSet = v_uint32()