Hi, monks!
I have error in code when I mix XS(with callbacks) and threads. Simple code to demonstrate (it works fine without threads):
Callback.xs 
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include "ppport.h"


CV* callback_ref;
int runCallback(const char* param)
{
    int count;
    int answer;

    dSP;

    ENTER;
    SAVETMPS;

    PUSHMARK(SP);
    XPUSHs(sv_2mortal(newSVpv(param, 0)));
    PUTBACK;

    count = call_sv((SV*)callback_ref, G_SCALAR);
    SPAGAIN;

    if (count != 1)
    croak("Uncknown return value format. Returned %d params instid 1",
+ count);
    answer = POPi;

    FREETMPS;
    LEAVE;

    return answer;
}


MODULE = Callback               PACKAGE = Callback              


void
registCallback(cb)
    CV* cb;
    PROTOTYPE: $
    PPCODE:
        callback_ref = cb;


void
runCallback(param)
    const char* param;
    PROTOTYPE: $
    PPCODE:
        XPUSHs(sv_2mortal( newSViv(runCallback(param)) ));

[download]

Callback.pm 
package Callback;

use 5.010000;
use threads;
use threads::shared;
use strict;
use warnings;

require Exporter;
use AutoLoader qw(AUTOLOAD);

our @ISA = qw(Exporter);

our $VERSION = '0.01';

require XSLoader;
XSLoader::load('Callback', $VERSION);


sub new
{
    my $invocant     = shift;
    my $callback_ref = shift;

    $invocant = ref $invocant if ref $invocant;

    registCallback($callback_ref);

    my $self = &share({});
    return bless $self, $invocant;
}


sub run
{
    my $self  = shift;
    my $param = shift;

    runCallback($param);
}


1;

[download]

test.pl 
#!/usr/bin/env perl
use strict;
use lib qw(./Callback/build/lib/perl5/i386-linux-thread-multi/);
use threads;
use threads::shared;

use Data::Dumper;

use Callback;

use constant MESSAGE => "Hellow world!!!\n";

my $obj = new Callback (\&printHellow);

my $thread = threads->create(sub {$obj->run(&MESSAGE)})
    or exit(1);
$thread->join();


sub printHellow
{
    my $message = shift;

    print "MESSAGE: $message\n";
}

[download]

OUTPUT: 
MESSAGE:
panic: free from wrong pool during global destruction.

In reply to xs, threads and panic by Anonymous Monk

Title:
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, details, 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, summary, 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.