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Date: Thu, 21 Nov 2002 00:37:39 +0000
From: Jamie Lokier <lk@tantalophile.demon.co.uk>
To: Ulrich Drepper <drepper@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>, Linus Torvalds <torvalds@transmeta.com>,
       Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [patch] threading enhancements, tid-2.5.47-C0
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Ulrich Drepper wrote:
> > - of
> > the order of a single system call time, i.e. not significant.  (That
> > delay is much shorter than signal delivery time itself).  No signals
> > are actually _lost_,
> 
> Of course they can get lost.  Normal Unix signals are not queued.

Oh yes they are.  Libc info for "Why Block":

   Temporary blocking of signals with `sigprocmask' gives you a way to
   prevent interrupts during critical parts of your code.  *If signals
   arrive in that part of the program, they are delivered later, after you
   unblock them.*

And sigpending(2):

   The sigpending call allows the examination of pending signals (ones
   which have been raised while blocked).  The signal mask of pending
   signals is stored in set".

-- Jamie
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