Chapter 21
Tying Attributes to UNIX Devices
Tying an element attribute to a UNIX device allows you to stream data serially from that device and then have the attribute dynamically updated with the new incoming data. Therefore, in ASPL, the elements of a group are not stagnant and do not always represent constant data. The user can program GG-functions to return dataset whose element attributes have been hooked to UNIX devices. Attributes of a named grouping class whose metadata are of type tie are hooked to processors and are updated in real time.In this chapter we will explain how to intersect two signals whose outputs have been tied to UNIX devices. The real time simulation of intersecting two datasets created from two streaming signal processors attached to UNIX devices is being discussed.
Recall that the group metadata is described in the ELMD (Element Metadata Descriptor) file, hence this is also the file where the tied attributes are being mapped. In addition, the tied attributes are bound to functions defined in a special feeder module called Udev, that we will refer to it with egC-feeder, and you can edit it with the tile-expansion command ~udev.
