package Glib::Thread::Queue;
use Moose;
use Glib;
use Thread::Queue;
use Carp;

has queue => (
    is => 'ro',
    isa => 'Thread::Queue',
    init_arg => undef,
    builder => '_build_queue',
    handles => [qw(
                      enqueue
                      dequeue
                      dequeue_nb
                      pending
                      peek
                      insert
                      extract
              )],
);

has pipes => (
    isa => 'ArrayRef',
    is => 'ro',
    builder => '_build_pipes',
);

sub _build_pipes {
    my ($main,$thread);pipe($main,$thread);

    return [$main,$thread];
}

sub _build_queue {
    return Thread::Queue->new();
}

after enqueue => sub {
    my ($self)=shift;
    syswrite $self->pipes->[1],'0';
};

before dequeue => sub {
    my ($self)=shift;
    my $foo;sysread $self->pipes->[0],$foo,1;
};

sub add_watch {
    my ($self,$sub)=@_;

    Glib::IO->add_watch(fileno($self->pipes->[0]),'in',$sub);
}

sub signal {
    my ($self)=@_;

    croak "Not signaling on an empty queue, would block"
        unless $self->pending;

    syswrite $self->pipes->[1],'0';
}

no Moose;
1;