Small optimisations, by Brandon Black

[p5sagit/p5-mst-13.2.git] / t / op / threads.t

#!./perl
BEGIN {
     chdir 't' if -d 't';
     @INC = '../lib';
     require './test.pl';	# for which_perl() etc
     $| = 1;
}

use strict;
use Config;

BEGIN {
     if (!$Config{useithreads}) {
	print "1..0 # Skip: no ithreads\n";
	exit 0;
     }
     if ($ENV{PERL_CORE_MINITEST}) {
       print "1..0 # Skip: no dynamic loading on miniperl, no threads\n";
       exit 0;
     }
     plan(6);
}
use threads;

# test that we don't get:
# Attempt to free unreferenced scalar: SV 0x40173f3c
fresh_perl_is(<<'EOI', 'ok', { }, 'delete() under threads');
use threads;
threads->create(sub { my %h=(1,2); delete $h{1}})->join for 1..2;
print "ok";
EOI

#PR24660
# test that we don't get:
# Attempt to free unreferenced scalar: SV 0x814e0dc.
fresh_perl_is(<<'EOI', 'ok', { }, 'weaken ref under threads');
use threads;
use Scalar::Util;
my $data = "a";
my $obj = \$data;
my $copy = $obj;
Scalar::Util::weaken($copy);
threads->create(sub { 1 })->join for (1..1);
print "ok";
EOI

#PR24663
# test that we don't get:
# panic: magic_killbackrefs.
# Scalars leaked: 3
fresh_perl_is(<<'EOI', 'ok', { }, 'weaken ref #2 under threads');
package Foo;
sub new { bless {},shift }
package main;
use threads;
use Scalar::Util qw(weaken);
my $object = Foo->new;
my $ref = $object;
weaken $ref;
threads->create(sub { $ref = $object } )->join; # $ref = $object causes problems
print "ok";
EOI

#PR30333 - sort() crash with threads
sub mycmp { length($b) <=> length($a) }

sub do_sort_one_thread {
   my $kid = shift;
   print "# 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..99999) {
      for my $k (sort mycmp @list) {}
   }
   print "# kid $kid after sort, sleeping 1\n";
   sleep(1);
   print "# kid $kid exit\n";
}

sub do_sort_threads {
   my $nthreads = shift;
   my @kids = ();
   for my $i (1..$nthreads) {
      my $t = threads->create(\&do_sort_one_thread, $i);
      print "# parent $$: continue\n";
      push(@kids, $t);
   }
   for my $t (@kids) {
      print "# parent $$: waiting for join\n";
      $t->join();
      print "# parent $$: thread exited\n";
   }
}

do_sort_threads(2);        # crashes
ok(1);

# Change 24643 made the mistake of assuming that CvCONST can only be true on
# XSUBs. Somehow it can also end up on perl subs.
fresh_perl_is(<<'EOI', 'ok', { }, 'cloning constant subs');
use constant x=>1;
use threads;
$SIG{__WARN__} = sub{};
async sub {};
print "ok";
EOI

# From a test case by Tim Bunce in
# http://www.nntp.perl.org/group/perl.perl5.porters/63123
fresh_perl_is(<<'EOI', 'ok', { }, 'Ensure PL_linestr can be cloned');
use threads;
print do 'op/threads_create.pl' || die $@;
EOI