In following example i'm testing several cases where shared object is assigned to shared hash. I observerd that if i use refcount on object reference or weaken on reference inside the shared hash after assignment this object fails to destroy. 
package Foo;
use threads;
use threads::shared;

sub new {
    my ($class, $share) = @_;
    
    print "Init\n";
    return $share ? bless shared_clone {} : bless {};
    
}

DESTROY {
    print "Destroy\n";
}
    
package main;
use common::sense;
use threads;
use threads::shared;
use Scalar::Util qw/weaken/;
use Devel::Refcount qw(refcount);

say "Test 1 (using two refcounts)";
{
    my %BAR :shared;
    my $foo = Foo->new(1);
    say refcount($foo);
    $BAR{foo} = $foo;
    say refcount($foo);
}

say "Test 2 (single refcount)";
{
    my %BAR :shared;
    my $foo = Foo->new(1);
    say refcount($foo);
    $BAR{foo} = $foo;
    #say refcount($foo);
}

say "Test 3 (no weaken)";
{
    my %BAR :shared;
    my $foo = Foo->new(1);
    $BAR{foo} = $foo;
#    weaken($BAR{foo});
}

say "Test 4 (with weaken)";
{
    my %BAR :shared;
    my $foo = Foo->new(1);
    $BAR{foo} = $foo;
    weaken($BAR{foo});
}

[download]
My output is: 
Test 1 (using two refcounts)
Init
1
1
Test 2 (single refcount)
Init
1
Destroy
Test 3 (no weaken)
Init
Destroy
Test 4 (with weaken)
Init

[download]
My main concern is that i can't use weaken on my shared objects inside a hash.

I'm using:
ActiveState Perl 5.12.4
threads 1.86
threads::shared 1.40
Devel::Refcount 0.09
Scalar::Util 1.23

Is this a bug? And is it possible to keep weak references to shared objects inside a hash?

In reply to Shared objects and refcount/weaken bug? by menth0l

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