From: Manfred Spraul <manfred@colorfullife.com>
To: Teemu Koponen <tkoponen@iki.fi>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Opening of blocking FIFOs not reliable?
Date: Sun, 14 Aug 2005 12:15:08 +0200 [thread overview]
Message-ID: <42FF19AC.6010502@colorfullife.com> (raw)
Teemu wrote:
>Opening a FIFO for WR_ONLY should release a previously blocked RD_ONLY
>open. I suspect this is not guaranteed on a heavily loaded Linux box.
>
>
Do you have a test case?
IIRC we had that bug, and it was fixed by adding PIPE_WCOUNTER:
PIPE_WRITERS counts the number of writers. This one is decreased during
close(). PIPE_WCOUNTER counts how often a writer was seen. It's never
decreased. Readers that wait for a writer wait until PIPE_WCOUNTER
changes, they do not look at PIPE_WRITERS.
--
Manfred
next reply other threads:[~2005-08-14 10:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-14 10:15 Manfred Spraul [this message]
2005-08-14 10:40 ` Opening of blocking FIFOs not reliable? Teemu Koponen
-- strict thread matches above, loose matches on Subject: below --
2005-08-13 3:18 Teemu Koponen
2005-08-14 0:49 ` Alan Cox
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