sleep and waking on signal handlers

TedYoung has asked for the wisdom of the Perl Monks concerning the following question:

I have a small script that goes to sleep for several minutes. I trap SIGINT so that I can do a graceful shutdown of the script. The problem is, if a SIGINT is sent to the script during sleep, the script won't see it until it wakes back up.

Is there a way to wake up the script when a signal is sent to it?

Update: Yes, I should have confessed I was on windows. I rarely use signals, and I rarely use windows. I forgot that it isn't the best combination. Thanks!

Thanks,

Ted Young

($$<<$$=>$$<=>$$<=$$>>$$) always returns 1. :-)

Comment on sleep and waking on signal handlers Download Code

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Re: sleep and waking on signal handlers by BrowserUk (Patriarch) on Aug 29, 2007 at 16:40 UTC
Change your long sleep to a loop: `my $count = 100; sleep 1 while --$count;` [download] This will consume negligable cpu but remain responsive even under safe-signals on any platform. Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice. "Too many [] have been sedated by an oppressive environment of political correctness and risk aversion."	[reply] [d/l]
Re: sleep and waking on signal handlers by ikegami (Patriarch) on Aug 29, 2007 at 16:09 UTC
`sleep` is interrupted by signals.	[reply] [d/l]
Re^2: sleep and waking on signal handlers by ikegami (Patriarch) on Aug 29, 2007 at 16:20 UTC
...or are you on Windows, where signals are only partially emulated? You might have better luck with SetConsoleCtrlHandler.	[reply]


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