Re: kern/45441: aio_write and aio_read connected to one pipe don't make progress

[Alexander Nasonov <alnsn%yandex.ru@localhost>]

The following reply was made to PR kern/45441; it has been noted by GNATS.

From: Alexander Nasonov <alnsn%yandex.ru@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
        netbsd-bugs%netbsd.org@localhost, alnsn%NetBSD.org@localhost
Subject: Re: kern/45441: aio_write and aio_read connected to one pipe don't
 make progress
Date: Thu, 13 Oct 2011 22:44:43 +0100

 David Laight wrote:
 >  On Wed, Oct 12, 2011 at 09:26:40PM +0100, Alexander Nasonov wrote:
 >  > The best fix, I think, is return ESPIPE for non-seekable fildes rather
 >  > than silently ignoring aio_offset. This would indirectly solve the issue
 >  > described in this PR.
 >  
 >  IIRC that breaks historic practise.
 
 Do you have any reference or any more details on this?
 
 >  The likely fubar here is that 'aio' is synchronous on a single kernel
 >  thread.
 
 Yes, I know. I wrote the test to prove that the current implementation
 has problems.
 
 Having separate writer and reader kernel threads would solve the
 problem but it's quite a lot of work.
 
 Alex