Re: [rtl] P.S....FIFO writes & reads atomic?

[Andris Pavenis <pavenis@lanet.lv>]

On Mon, 15 Jun 1998, Richard Prescott wrote:

> On Sun, 14 Jun 1998, James Cassidy wrote:
> 
> > 
> > P.S.  Is there any way to determine the number of bytes 
> > currently sitting in the FIFO waiting to be read?
> > 
> 
> Add a ioctl to rt_fifo_new.c that will call a function available for
> modules !?
> 

Nice. I think some more things should be needed:

I would prefer to communicate with real time driver through 
ioctl calls rather than using rt-fifo to send commands.
Some additional call (e.g. rt_create_ioctl_handler) should be
required to add a handler to rt-fifo. Some predefined ioctl 
calls should then do some usefull things:
    - return size of data that currently are in FIFO;
    - clear all data in fifo (also sometimes needed, Comments
      in rtf.h says that rtf_resize does this by error but no one
      should relay on feature that is called as error. 
    - may be also something else

Andris Pavenis
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