Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
I just want to be able to set the program to run for a couple of hours (if need be) and then stop.

(additional emphasis by me)

I personally believe that for such prolonged times a solution along the lines of that suggested by L~R is best suited. Playing with alarm as duly suggested by ccn is more important in short lived situations in which finer control over time is needed and/or you need to timeout "no matter what" e.g. when running external processes:

#!/usr/bin/perl use strict; use warnings; use 5.010; use File::Basename; my $pname; BEGIN { ($pname)=fileparse $0, qr/\.pl/i } my $TIME = 10; if (@ARGV) { # Working as a generic external program sleep +(my $time=shift); say "Slept $time seconds"; } else { # Example of timeout via alarm() my ($msg, $timeout) = ("died in SIG ALRM", int rand 2*$TIME); eval { local $SIG{ALRM} = sub {die $msg}; warn "[$pname] Trying to collect output from external program. +\n", "(Setting timeout to $timeout seconds.)\n"; alarm($timeout); chomp(my $output = qx/perl $0 $TIME/); say "The output got from external program is: `$output'"; alarm(0); }; if ($@ and $@ ~~ /\Q$msg/) { warn "[$pname] Timed out!\n"; } } __END__

Incidentally, it is worth reminding that for finer control over (not necessarily) short times a precious module would be Time::HiRes, which is in core.

--
If you can't understand the incipit, then please check the IPB Campaign.

In reply to Re: Running code a certain amount of time by blazar
in thread Running code a certain amount of time by Ninth Prince

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others about the Monastery: (5)
As of 2024-03-28 14:10 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found