On Fri, 28 Sep 2001, Victor Yodaiken wrote:
> You're welcome to send a patch and your tone is fine, but ...
> 1. Stuart is right, it's easy, just put the function in the rtl_fifos code
I am not sure what you are referring to... if you are saying that
creating a custom function to return fifo size is easy, then yes, I agree
with that one.. :)
> 2. I hate adding functions so my question is always "why do you have to have
>it"?
Well, because. :) No seriously I think it's a fair feature of a fifo
for one to be able to query its size and/or fill. Also, I am being
particularly anal with respect to my rt-task talking to userland and I
want to be absolutely sure that I don't have any failed and/or partial
writes.. the only way to really accomplish this is to have the ability to
query the fifo size/freeness. I don't *absolutely* need this feature, but
if would make me happy if this feature were included. :)
-Calin
>
>
> On Fri, Sep 28, 2001 at 04:21:45PM -0400, Calin A. Culianu wrote:
> >
> > I realize the tone of my previous this email seems impatient.. it isn't.
> > Actually if you guys would honor me with your approval, I can gladly
> > submit a patch that defines an interface for my proposed solution (a)
> > below, or one that moves the struct definition of struct rtl_fifo_struct
> > over to the more public 'rtl_fifo.h' header file. (Since the kernel symbol
> > rtl_fifos is already exported).
> >
> >
> > Please allow me to be an rt-linux developer!! :)
> >
> > -Calin
> >
> > ---------- Forwarded message ----------
> > Date: Fri, 28 Sep 2001 15:35:38 -0400 (EDT)
> > From: Calin A. Culianu <[EMAIL PROTECTED]>
> > To: [EMAIL PROTECTED]
> > Cc: rtl <[EMAIL PROTECTED]>
> > Subject: RE: [rtl] number of elements in a fifo
> >
> > Well, in kernel mode there's no way to tell how full a fifo is (as of rtl
> > 3.1)!
> >
> > Actually, that macro only occurs in rtl_fifo.c, and furthermore, the
> > exported kernel symbol "rtl_fifos" that the macro really uses is of
> > type struct rt_fifo_struct, which is a private type inside rtl_fifo.c!
> >
> > Why is kernel symbol 'rtl_fifos' exported when its type is private?
> > It aggravates me!!
> >
> > Can someone on the rt-linux dev team either kindly:
> >
> > a) create a public interface to find out the size and/or the bytes free in
> > an rtf (this is trivial, just make a function that returns
> > rtl_fifos[minor].bufsize, rtl_fifos[minor].len etc).
> >
> > OR
> >
> > b) make struct rtl_fifo_struct a public struct???? (since the array of
> > fifos is exported into the kernel symbol table anyway).
> >
> > -Calin
> >
> > On Fri, 21 Sep 2001, stuart warren wrote:
> >
> > > To read how full the fifo is from userspace...
> > >
> > > int bytes_in_fifo;
> > > ioctl(rtfifo_fd, FIONREAD, &bytes_in_fifo);
> > >
> > > In the kernel you can use...
> > >
> > > bytes_in_fifo = RTF_LEN(fifo_number);
> > >
> > > Cheers,
> > > Stuart
> > >
> > > -----Original Message-----
> > > From: fred august [mailto:[EMAIL PROTECTED]]
> > > Sent: Thursday, 20 September 2001 6:00
> > > To: rtl
> > > Subject: [rtl] number of elements in a fifo
> > >
> > >
> > > Hi,
> > > is there a simple way to know how many elements
> > > are in a FIFO? This should be in RT, or almost, for a
> > > FIFO between a RT thread and a user space one. I need
> > > this information in order to dump some of the elements
> > > if the FIFO is too full.
> > >
> > > thanks
> > >
> > > f
> > >
> > > ______________________________________________________________________
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