Hi,

I'm trying to access the data held in a class in the main thread of the application from a second thread. The second thread allows a single client to connect and query the information in the class.

I understand that the variables aren't locked yet but I'm not at the point to worry about that yet.

I can call functions from the class but the data is empty since the second thread simply has a copy of the class in shared memory but no access to the current data in the class.

Here is a cut down code I'm looking for help with:

#################################################################
# This package is an actual found tag

package Tag;
sub new {
    my $class = shift;
    my $self = {
        _TagID          => shift,
    _ProductName    => shift,
    _ProductDesc    => shift,
    _ProductPrice   => shift,
    };
    bless $self, $class;
    if (0) {
    print "_TagID:".$self->{_TagID} . "\n";
    print "_ProductName:".$self->{_ProductName} . "\n";
    print "_ProductDesc:".$self->{_ProductDesc} . "\n";
    print "_ProductPrice:".$self->{_ProductPrice} . "\n";
    }
    return $self;
}

#################################################################
# This package will contain a list of tags. It will handle
# managing and expiring tags

package TagList;
sub new {
    my $class = shift;
    my @TagList = ();
    my $self = {
        'TagList'          => \@TagList,
    };
    bless $self, $class;
    return $self;
}

sub NumberOfTags {
    my ($self, $value) = @_;
    return @{$self->{'TagList'}};
}


#################################################################

package main;
my $CurrentTagList = TagList->new();
bless($CurrentTagList, 'TagList');
my $thr = threads->create(\&http_listen);

while() {
    # read and process tags to fill $CurrentTagList
    # gets data from a client at a 200 ms interval
}


#################################################################
# functions for HTTP thread
# this will eventually allow a single client to connect and get the ta
+g information at it's own interval

sub http_listen {
    my $http_lsn = new IO::Socket::INET(Listen => 1, LocalPort => 8080
+, ReuseAddr => 1) || die "Error creating socket: $!";
    my $http_sel = new IO::Select( $http_lsn );
    my $line = "";
    while (my @ready = $http_sel->can_read) {
    foreach my $fh (@ready) {
        if ($fh == $http_lsn) {
        my $new = $http_lsn->accept;
        $http_sel->add($new);
        my $host = $new->peerhost;
        print "[Accepting HTTP connection from $host]\n";
        } else {
        $line = <$fh>;
        print $line;
        print 'HTTP - There are ' . $CurrentTagList->NumberOfTags() . 
+' tags' . "\n\n";
        sleep(1);
        }
    }
    }
}

#################################################################
[download]

In the above example, in http_listen $CurrentTagList->NumberOfTags() is always = 0 as you would expect. But, my question is, how do I allow the http_listen function to access the current data held in $CurrentTagList in the main thread?

Thanks for any and all help

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