Hello dear,
I'm getting troubles in XS modules when i use threads. In addition to MY_CXT i need a clean destructor for system resources like file handles, that are not clonable. The following example does exactly the same (bad thing) like my XS modules do. A new thread is created before the previous thread detachs. CLONE is called correctly, but DESTROY is called to less. Is it a bug or do i wrong? Please help. 
#!/usr/local/bin/perl

use threads;

use Time::HiRes qw/usleep/;

while( 1 ) {
    my $class = Class->new();
    threads->create( \&thread_sub, $class );
    usleep 200_000;
}

sub thread_sub {
    my( $class ) = @_;
    usleep 400_000;
    threads->self->detach;
}

1;

package Class;

use threads::shared;

our %MY_CXT : shared = ();
our $CXT_ID : shared = 0;

sub new {
    my $pkg = shift;
    my $this = {};
    $this->{'shared'} = &share( {} ),
    $this->{'shared'}{'refcnt'} = 1;
    lock( %MY_CXT );
    $this->{'id'} = ++ $CXT_ID;
    $MY_CXT{$this->{'id'}} = $this->{'shared'};
    bless $this, $pkg;
}

sub CLONE {
    my $this = shift; # not applicable
    lock( %MY_CXT );
    while( my( $k, $v ) = each %MY_CXT ) {
        $v->{'refcnt'} ++;
        print "CLONE: id $k, refcnt $v->{'refcnt'}\n";
    }
}

sub DESTROY {
    my $this = shift;
    my $shared = $this->{'shared'};
    $shared->{'refcnt'} --;
    print "DESTROY: id $this->{'id'}, refcnt $shared->{'refcnt'}\n";
    if( $shared->{'refcnt'} <= 0 ) {
        lock( %MY_CXT );
        delete $MY_CXT{$this->{'id'}};
    }
}

1;

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In reply to CLONE/DESTROY want work at all?? by spacepille

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