Linux userland API discussions
 help / color / mirror / Atom feed
From: Roland McGrath <roland-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Cc: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
	LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Oleg Nesterov <oleg-6lXkIZvqkOAvJsYlp49lxw@public.gmane.org>,
	Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>,
	Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	drepper-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
Subject: Re: [patch 0/3] add rt_tgsigqueueinfo syscall [RESEND]
Date: Fri, 27 Feb 2009 18:44:24 -0800 (PST)	[thread overview]
Message-ID: <20090228024424.D237CFC3DA@magilla.sf.frob.com> (raw)
In-Reply-To: Michael Kerrisk's message of  Saturday, 28 February 2009 14:53:23 +1300 <cfd18e0f0902271753ld9b432tae6c0ee783a24480-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

> With respect to the first point, it seems to me reasonably likely that
> there would be use cases where the receiving thread wants to know the
> thread ID of the sender -- especially when sender and receiver are in
> the same process.

But expecting si_pid to play that role is bizarre.  It's never what any
POSIX-like program would do, both since POSIX says si_pid is a process ID,
and because there are no POSIX-like interfaces at all that use Linux TIDs
to refer to threads.

Wanting this only seems plausible within one process.  In that case, sender
and recipient know they share memory.  The normal thing to do (and what
POSIX applications will do) is to store that info somewhere pointed to by
the sigval.


Thanks,
Roland
--
To unsubscribe from this list: send the line "unsubscribe linux-api" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

  parent reply	other threads:[~2009-02-28  2:44 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20090226133339.875832967@linutronix.de>
     [not found] ` <20090226133339.875832967-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
2009-02-26 21:19   ` [patch 0/3] add rt_tgsigqueueinfo syscall [RESEND] Michael Kerrisk
     [not found]     ` <cfd18e0f0902261319v20ba7bd1pcc91ccc4b2c7d577-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-02-26 22:13       ` Thomas Gleixner
     [not found]         ` <alpine.LFD.2.00.0902262311350.9135-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2009-02-28  1:53           ` Michael Kerrisk
     [not found]             ` <cfd18e0f0902271753ld9b432tae6c0ee783a24480-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-02-28  2:44               ` Roland McGrath [this message]
     [not found]                 ` <20090228024424.D237CFC3DA-nL1rrgvulkc2UH6IwYuUx0EOCMrvLtNR@public.gmane.org>
2009-02-28  8:46                   ` Michael Kerrisk
2009-02-27  0:03       ` Roland McGrath
     [not found]         ` <20090227000352.7D32BFC339-nL1rrgvulkc2UH6IwYuUx0EOCMrvLtNR@public.gmane.org>
2009-03-23 11:14           ` Thomas Gleixner
     [not found]             ` <alpine.LFD.2.00.0903231213180.29264-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2009-03-24  6:58               ` Roland McGrath

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20090228024424.D237CFC3DA@magilla.sf.frob.com \
    --to=roland-h+wxahxf7alqt0dzr+alfa@public.gmane.org \
    --cc=drepper-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
    --cc=linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=mingo-X9Un+BFzKDI@public.gmane.org \
    --cc=mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \
    --cc=oleg-6lXkIZvqkOAvJsYlp49lxw@public.gmane.org \
    --cc=tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox