Marcelo Coelho wrote: > Hi list! > > > Following the last email, I've decided to change the protocol used by > the application and port it to use RTnet and RTAI. But now there is a > relevant issue: How can I use a "select" mechanism with RTnet file > descriptors? > > I'm using the select function to determine if a certain lan as received > any information. If any of the 3 lans received something, then the > application will process that data and act accordingly. > > So, is there some kind of mechanism to do this (besides waiting to read > from a certain socket until a certain timeout :) )? >
select() itself is a fairly heavy-weighted mechanism that is, moreover, tricky to implement in a deterministic manner (i.e. without the need for dynamic memory allocations). RTnet, or better now RTDM, does not support this kind signalling so far. But if you are only listening on the same type of socket, can't you map your incoming data on a single socket and read from it (with timeout)? See, this is about weighing the effort to establish and maintain the required infrastructure in both RTDM and the drivers versus designing the real-time application in a different way. I'm always open to learn about scenarios where select-like mechanisms are such urgently required that they would justify an effort in this direction. Jan
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