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From: Neil Brown <neilb@cse.unsw.edu.au>
To: Alex Pennace <alex@pennace.org>
Cc: Bernd Eckenfels <ecki@lina.inka.de>, linux-kernel@vger.kernel.org
Subject: Re: Desperately missing a working "pselect()" or similar...
Date: Sat, 6 Oct 2001 09:22:00 +1000 (EST)	[thread overview]
Message-ID: <15294.16536.430907.650513@notabene.cse.unsw.edu.au> (raw)
In-Reply-To: message from Alex Pennace on Friday October 5
In-Reply-To: <3BBDD37D.56D7B359@isg.de> <E15pbid-0007fi-00@calista.inka.de> <20011005190523.A6516@buick.pennace.org>

On Friday October 5, alex@pennace.org wrote:
> On Fri, Oct 05, 2001 at 10:36:53PM +0200, Bernd Eckenfels wrote:
> > In article <3BBDD37D.56D7B359@isg.de> you wrote:
> > > Without a proper pselect() implementation (the one in glibc is just
> > > a mock-up that doesn't prevent the race condition) I'm currently
> > > unable to come up with a good idea on how to wait on both types
> > > of events.
> > 
> > Isnt select() returning with EINTR?
> 
> The select system call doesn't return EINTR when the signal is caught
> prior to entry into select.

A technique I used in a similar situation once went something like:

tv.tv_sec=bignum;
tv.tv_usec = 0;
enable_signals();
select(nfds, &readfds,&writefds,0,&tv);

and have the signal handlers set tv.tv_sec to 0. (tv is a global
variable).

Then if the signal comes before the select, the select exits
immediately.

NeilBrown

  parent reply	other threads:[~2001-10-05 23:22 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
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 [this message]
2001-10-05 23:30       ` Alex Pennace
2001-10-05 23:43         ` David Schwartz
2001-10-06  0:03       ` Alan Cox
2001-10-08 16:32 lkv
2001-10-08 16:44 ` Alan Cox
2001-10-08 17:06   ` lkv
2001-10-08 17:24     ` Alan Cox
2001-10-09 13:37 ` Jan Hudec
2001-10-13 16:05   ` Jamie Lokier

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