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Re: die through several evals

by kennethk (Monsignor)
on Apr 23, 2013 at 16:42 UTC ( #1030194=note: print w/ replies, xml ) Need Help??


in reply to die through several evals

I can't check $@ or override eval function to propagate die.
Why can't you check $@? This sounds like an artificial constraint. Why can't you simply branch and die if the eval fails, e.g.
local $SIG{ALRM} = sub{die "Timeout hit\n"}; eval { eval { magick_die; }; if ($@ and $@ eq "Timeout hit\n") { die $@; } };

You could also fork and run the alarm in the parent thread. Then it really doesn't matter what the flow in the child is.


#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.


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Re^2: die through several evals
by nyaapa (Novice) on Apr 24, 2013 at 08:59 UTC
    because i only have a anonymous sub and i don't know if there any evil in it... i cant modify this sub..
      What sort of tasks/side effects are happening in the subroutines? You may be able to solve your issue with a fork, a la:
      use strict; use warnings; if (my $pid = fork) { eval { local $SIG{ALRM} = sub{die "Timeout hit\n"}; alarm 1; wait; alarm 0; 1; } or do { print $@; kill 9, $pid; } } else { magick_die(); exit; } sub magick_die { my $var = 0; for (1 ... 1000000) { $var++ for 1 .. 1000000; } }

      If you need to pass information back and forth, you could serialize over pipes.


      #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

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