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Postings from November 2002
I'm writing a script that has to be automatically
executed every day at 6:00 AM via 'dollar universe' scheduler software.
I want my script to stop itself at 23:00 PM
(I think to timeout via alarm function).
The script is mainly a while(1) loop and I want my loop
to sleep few seconds before going to the next iteration.
How can handle this without mixing alarm and sleep ?
Am I "bad bad guy" :-) doing the following ?
#!/usr/bin/perl -w
use strict;
use MyClass;
my $obj=MyClass->new();
my $time_to_die=0;
my $start=6; #process starts at 6:00 AM
my $end=23; #process ends at 23:00
my $timeout=($end-$start)*3600; #in seconds
my $sleep=5;
$SIG{ALRM} = sub { $time_to_die=1; };
alarm($timeout);
#-----
#Main
#-----
eval{
while(!$time_to_die){
#get_request() retrieves request's info from an Oracle table.
$obj->get_request() and $obj->run();
sleep($sleep);
}
die "got_time_out";
};
if($@){
if($@=~/got_time_out/){
exit(0);
}
else{
alarm(0);#clear the still-pending alarm
$obj->report_failure($@);
exit -1;
}
}
__END__
> -----Original Message-----
> From: david [mailto:dzhuo@looksmart.net]
> Sent: Wednesday, November 27, 2002 8:59 PM
> To: beginners@perl.org
> Subject: RE: how do i make a script run for a certain period of time?
>
>
> Nyimi Jose wrote:
>
> >> -----Original Message-----
> >> From: david [mailto:dzhuo@looksmart.net]
> >> Sent: Wednesday, November 27, 2002 8:34 PM
> >> To: beginners@perl.org
> >> Subject: RE: how do i make a script run for a certain
> period of time?
> >>
> >>
> >> Nyimi Jose wrote:
> >>
> >> > If you want your loop to first finish
> >> > what he is doing before die, do this instead.
> >> > Thus,when you receive the alarm sig you exit
> >> > first the loop then the script.
> >> >
> >> >
> >> > #!/usr/bin/perl -w
> >> >
> >> >
> >>
> >> you must be a bad bad guy!!! :-) just kidding!
> >
> > Sorry !
> >
> >> never listen to the perldoc hua? don't ever mix sleep and
> alarm! on
> >> most platform, sleep is implemented using alarm call. the problem?
> >> the alarm call inside the sleep function will thus replace your
> >> alarm function
> >> just outside the while loop. check the perldoc -f alarm for more.
> >
> > What about this ?:
> >
> > use strict
> > my $time_to_die=0;
> > my $timeout=30; #in seconds
> >
> > $SIG{ALRM} = sub { $time_to_die=1; };
> >
> > alarm($timeout);
> > while(!$time_to_die){
> > #tasks here
> > }
> > __END__
> >
>
> much better. a bit different than my first post. your code
> will at least
> execute the whole block of the while loop. my original post
> will die in the
> middle. if he never want to die in the middle of the while
> loop even the
> alarm expires, your solution is better. if he want to die as
> soon as the
> alarm expires, my solution is bit better.
>
> david
>
> --
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>
>
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