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Date: Tue, 8 Feb 2005 15:22:19 -0600
From: Brian Ford <ford AT vss DOT fsi DOT com>
Reply-To: cygwin AT cygwin DOT com
To: Max Bowsher <maxb AT ukf DOT net>
cc: cygwin AT cygwin DOT com
Subject: Re: Problem with alarm() not functioning twice in one program.
In-Reply-To: <002201c50e1f$943c9320$e6ec6f83@robinson.cam.ac.uk>
Message-ID: <Pine.CYG.4.58.0502081458380.1356@fordpc.vss.fsi.com>
References: <030901c50e1d$51a22b30$e6ec6f83 AT robinson DOT cam DOT ac DOT uk> <Pine DOT CYG DOT 4 DOT 58 DOT 0502081437580 DOT 1356 AT fordpc DOT vss DOT fsi DOT com> <002201c50e1f$943c9320$e6ec6f83 AT robinson DOT cam DOT ac DOT uk>
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On Tue, 8 Feb 2005, Max Bowsher wrote:
> Brian Ford wrote:
> > On Tue, 8 Feb 2005, Max Bowsher wrote:
> >> The following program produces the output:
> >>
> >> Begin
> >> Done
> >> Begin
> >> ...and then hangs.
> >>
> >> Can anyone help me understand why?
> >>
> > http://www.cygwin.com/ml/cygwin/2004-10/msg00598.html
>
> Ah, OK.
>
> So are you saying "SIGALRM has been entered, but has not returned, so the
> signal handling code won't try to enter it again" ?

SIGALRM has been blocked upon entry to the signal handling routine.
Since you long jumped out of it, it's still blocked.

Did you follow that thread through to the end?  Maybe I should have quoted
this instead:

http://www.cygwin.com/ml/cygwin/2004-10/msg00606.html

-- 
Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained pilot...

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