How to make a good asyncrhronous comunication.

[Paolo Mantegazza]

José Antonio Sánchez wrote:
> I need to comunicate two processes but I only want to write complete
> messages. The problem with a FIFO is that you can write half of a
> message without error. With a mailbox you have the r_mbx_send_if so,
> if there is no space to write the whole message, nothing is written to
> the mailbox, but I can't find something similar in a FIFO.
> On the other hand, I have to comunicate my real time application with
> a GUI process (made in QT), so I have to get the data asynchronously
> to let the GUI receive mouse events. That could be made with a FIFO in
> real time and a QSocketNotifier in the user space. But, Is there a way
> to make something similar with a mailbox? How?

Use the latest tbx.c, found within 3.2 and magma. Tbxes implements an 
integrated static buffering scheme and dynamic memory allocation to 
grant complete prioritised message transfers. So if you provide enough 
real time heap to RTAI it is difficult to lose anything.

Paolo.