On Mon, Oct 01, 2001 at 11:15:59AM -0400, Calin A. Culianu wrote: > I personally see no drawback to this feature.. it costs nothing in terms > of code complexity (the data structures for this info are there already) > and maybe causes like 15 bytes of additional binary bloat. :) (I know, > kernel memory is so precious.. but well.. 15 bytes that can be optionally > config'd out hopefully won't kill anyone's computer too badly...) > > > > > is not nice enough, then I suggest > > > > RTF_GETSIZE > > as an added ioctl. > > > > Adding an ioctl? Aren't ioctl's sort of user-space-oriented things? I > agree that it might be a nice feature for userland, but are you suggesting > this in lieu, or in addition to, my proposed functions? Here is what I > propose in the kernel (in rt_fifo.c, to be exact). > > int /* returns the total 'bufsize' of FIFO fifo, or errno on error */ > rtf_size(int fifo); > > int /* returns total bytes of available space in FIFO fifo, or errno */ > rtf_bytesfree(int fifo); > > As far as the ioctl functionality.. that's a really good suggestion. I > can add that too.. :)
I'd rather see it in ioctl using the POSIX API in RTL. The less API growth the better. > > > then send a patch with an optional config option and we'll see > > if anyone else uses it. > > Ok... I will come up with something and send it in.. thanks!! :) Look forward to it. > > -Calin > > > > > > > > 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 > > > > > > > > > > > > ______________________________________________________________________ > > > > > > Do You Yahoo!? > > > > > > Il tuo indirizzo gratis e per sempre @yahoo.it su http://mail.yahoo.it > > > > > > > > > > > > -- [rtl] --- > > > > > > To unsubscribe: > > > > > > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > > > > > > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > > > > > > -- > > > > > > For more information on Real-Time Linux see: > > > > > > http://www.rtlinux.org/ > > > > > > > > > > > > -- [rtl] --- > > > > > > To unsubscribe: > > > > > > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > > > > > > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > > > > > > -- > > > > > > For more information on Real-Time Linux see: > > > > > > http://www.rtlinux.org/ > > > > > > > > > > > > > > > > > > > > > -- [rtl] --- > > > > > To unsubscribe: > > > > > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > > > > > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > > > > > -- > > > > > For more information on Real-Time Linux see: > > > > > http://www.rtlinux.org/ > > > > > > > > -- [rtl] --- > > > > To unsubscribe: > > > > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > > > > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > > > > -- > > > > For more information on Real-Time Linux see: > > > > http://www.rtlinux.org/ > > > > > > > > > > -- [rtl] --- > > > To unsubscribe: > > > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > > > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > > > -- > > > For more information on Real-Time Linux see: > > > http://www.rtlinux.org/ > > -- [rtl] --- > > To unsubscribe: > > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > > -- > > For more information on Real-Time Linux see: > > http://www.rtlinux.org/ > > > > -- [rtl] --- > To unsubscribe: > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > -- > For more information on Real-Time Linux see: > http://www.rtlinux.org/ -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] -- For more information on Real-Time Linux see: http://www.rtlinux.org/
