Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

This is the third installment of my Perl threads experiments. Again, I have something I don't understand and seek advice before perl-bugging it.

The test program below crashes for me on both Linux and Windows when you use an external sort function -- but not if you use an inline sort block. I am using Perl 5.8.4. Any explanations?

#!/usr/bin/perl -w use strict; use threads; $|=1; sub mycmp { length($b) <=> length($a) } sub do_one_thread { my $kid = shift; warn "kid $kid before sort\n"; my @list = ( 'x', 'yy', 'zzz', 'a', 'bb', 'ccc', 'aaaaa', 'z', 'hello', 's', 'thisisalongname', '1', '2', '3', 'abc', 'xyz', '1234567890', 'm', 'n', 'p' ); for my $j (1..1000) { # This does not crash # for my $k (sort { length($b) <=> length($a) } @list) {} # Yet this does for my $k (sort mycmp @list) {} } warn "kid $kid after sort\n"; } sub do_threads { my $nthreads = shift; my @kids = (); for my $i (1..$nthreads) { my $t = threads->new(\&do_one_thread, $i); warn "parent $$: continue\n"; push(@kids, $t); } for my $t (@kids) { warn "parent $$: waiting for join\n"; $t->join(); warn "parent $$: thread exited\n"; } } # do_threads(1); # does not crash do_threads(2); # crashes

In reply to Perl threads sort test program crashes by eyepopslikeamosquito

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

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

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

    How do I use this? | Other CB clients
    Other Users?
    Others about the Monastery: (10)
    As of 2019-06-24 13:31 GMT
    Find Nodes?
      Voting Booth?
      Is there a future for codeless software?

      Results (98 votes). Check out past polls.