lkml.org 
[lkml]   [2018]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 8/9] aio: implement io_pgetevents
On Wed, Mar 21, 2018 at 10:24:43AM +0100, Greg KH wrote:
> On Wed, Mar 21, 2018 at 08:32:31AM +0100, Christoph Hellwig wrote:
> > This is the io_getevents equivalent of ppoll/pselect and allows to
> > properly mix signals and aio completions (especially with IOCB_CMD_POLL)
> > and atomically executes the following sequence:
> >
> > sigset_t origmask;
> >
> > pthread_sigmask(SIG_SETMASK, &sigmask, &origmask);
> > ret = io_getevents(ctx, min_nr, nr, events, timeout);
> > pthread_sigmask(SIG_SETMASK, &origmask, NULL);
> >
> > Note that unlike many other signal related calls we do not pass a sigmask
> > size, as that would get us to 7 arguments, which aren't easily supported
> > by the syscall infrastructure. It seems a lot less painful to just add a
> > new syscall variant in the unlikely case we're going to increase the
> > sigset size.
>
> Do we have a manpage for this new syscall and maybe a test program for
> it so we can exercise it as part of the kselftests?

The man page and test cases where submitted to libaio:

http://git.infradead.org/users/hch/libaio.git/shortlog/refs/heads/aio-poll

In the meantime the man page apparently moved to man-pages, I'll do that
work once we make some forward progress.

> And do we really need a compat thunk for a new syscall? Ugh, I guess
> it's needed due to the long mess, right? No way to just define it the
> same way for both arch sizes?

Not without making it a pain to use. It should be a drop-in enhancement
to the existing aio abis, which all work on these types.

\
 
 \ /
  Last update: 2018-03-21 10:30    [W:1.699 / U:0.012 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site