Re: select() bug

From: Marc Lehmann (pcg@goof.com)
Date: Fri Nov 03 2000 - 02:05:24 EST

Next message: Andre Hedrick: "OKAY (Re: That Dirty Son of a Bitch, Bill Gates!!!)"
Previous message: David Weinehall: "Re: That Dirty Son of a Bitch, Bill Gates!!!"
In reply to: Alan Cox: "Re: select() bug"
Next in thread: Stanislav Meduna: "Re: select() bug"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

On Thu, Nov 02, 2000 at 11:55:52PM +0000, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> > - If I'm correct that pipes have a 4K kernel buffer, then writing 1
> > byte shouldn't cause this situation, as the buffer is well more than
> > half empty. Is this still a bug?
>
> The pipe code uses totally full/empty. Im not sure why that was chosen

Just a quick guess: maybe because of the POSIX atomicity guarantees (if
select returned, write might have to block which is not what is expected),
and maybe this limitation was used not only on write but on read (Although
it's not necessary on the read side, AFAIK).

-- 
      -----==-                                             |
      ----==-- _                                           |
      ---==---(_)__  __ ____  __       Marc Lehmann      +--
      --==---/ / _ \/ // /\ \/ /       pcg@opengroup.org |e|
      -=====/_/_//_/\_,_/ /_/\_\       XX11-RIPE         --+
    The choice of a GNU generation                       |
                                                         |
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

Next message: Andre Hedrick: "OKAY (Re: That Dirty Son of a Bitch, Bill Gates!!!)"
Previous message: David Weinehall: "Re: That Dirty Son of a Bitch, Bill Gates!!!"
In reply to: Alan Cox: "Re: select() bug"
Next in thread: Stanislav Meduna: "Re: select() bug"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

This archive was generated by hypermail 2b29 : Tue Nov 07 2000 - 21:00:13 EST