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Re^3: $SIG{ALRM} and windows vista?

by BrowserUk (Pope)
on Jan 04, 2010 at 06:56 UTC ( #815527=note: print w/ replies, xml ) Need Help??


in reply to Re^2: $SIG{ALRM} and windows vista?
in thread $SIG{ALRM} and windows vista?

Not on my Vista system.


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.


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Re^4: $SIG{ALRM} and windows vista?
by ikegami (Pope) on Jan 04, 2010 at 06:58 UTC

    It sounds like you're saying that signals don't interrupt I/O on Windows, but you know that only thing that Windows has that is similar to signals are Ctrl-C and Ctrl-Break. Are you saying they don't interrupt I/O? I haven't tested how they work.

    Update: Clarified.

      Windows doesn't have signals

      No, but it simulates some of them:

      use strict; use warnings; use 5.010; print 'Enter your password: '; my $password = eval { local $SIG{ALRM} = sub {die "timeout\n"}; alarm 5; # return <STDIN>; sleep 10; }; alarm 0; if ($@ =~ /timeout/) { print "You timed out.\n"; } __END__ [ 7:18:01.22] C:\test>alarmit.pl Enter your password: You timed out.

      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.

        A little bit of bean counting:

        Windows has no signals, and it does not emulate them. It's perl that implements an incomplete emulation of Unix signals, without support from Windows.

        From perlport:

        Don't count on signals or %SIG for anything.

        Alexander

        --
        Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)

        On Windows Vista, your code doesn't do anything useful. Specifically, your code fails to display the message "Enter your password:" and then wait for the user to enter their password. Instead, your code does nothing, then prints out "Enter your password: you timed out."

        In an effort to get "Enter your password: " to display immediately, I tried setting the output buffer to flush output immediately by setting $| = 1, but that didn't change the result.

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