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From: lkv@isg.de
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Kernel Linux <linux-kernel@vger.kernel.org>
Subject: Re: Desperately missing a working "pselect()" or similar...
Date: Mon, 08 Oct 2001 19:06:31 +0200	[thread overview]
Message-ID: <3BC1DD17.EACD968@isg.de> (raw)
In-Reply-To: <E15qdVw-00016L-00@the-village.bc.nu>

Alan Cox wrote:
> 
> > Hmmm... would you say the "siglongjmp" method is better than the "self-pipe"
> > method for a select on both file descriptors and signals too?
> 
> siglongjmp doesnt have to make any syscalls so intuitively I'd say it
> ought to be more efficient

Are you sure? Doesn't sigsetjmp() call sigprocmask in order to obtain
the current signal mask?

In the glibc I read:

int
__sigjmp_save (sigjmp_buf env, int savemask)
{
  env[0].__mask_was_saved = (savemask &&
                             __sigprocmask (SIG_BLOCK, (sigset_t *) NULL,
                                            &env[0].__saved_mask) == 0);

  return 0;
}


*sigh* things could be so easy if there was a working pselect()...


Regards,

Lutz vieweg


--
 Dipl. Phys. Lutz Vieweg | email: lkv@isg.de
 Innovative Software AG  | Phone/Fax: +49-69-505030 -120/-505
 Feuerbachstrasse 26-32  | http://www.isg.de/people/lkv/
 60325 Frankfurt am Main | ^^^ PGP key available here ^^^

  reply	other threads:[~2001-10-08 17:06 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-10-08 16:32 lkv
2001-10-08 16:44 ` Alan Cox
2001-10-08 17:06   ` lkv [this message]
2001-10-08 17:24     ` Alan Cox
2001-10-09 13:37 ` Jan Hudec
2001-10-13 16:05   ` Jamie Lokier
  -- strict thread matches above, loose matches on Subject: below --
2001-10-05 15:36 lkv
2001-10-05 16:19 ` Alexander Viro
2001-10-05 16:28   ` lkv
2001-10-05 16:36 ` Christopher Friesen
2001-10-05 16:40   ` lkv
2001-10-05 20:37 ` Bernd Eckenfels
2001-10-05 23:05   ` Alex Pennace
2001-10-05 23:13     ` Alan Cox
2001-10-05 23:52       ` Alex Pennace
2001-10-05 23:22     ` Neil Brown
2001-10-05 23:30       ` Alex Pennace
2001-10-05 23:43         ` David Schwartz
2001-10-06  0:03       ` Alan Cox

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