+sub expire_old () {
+ my $now = now();
+ my $exp = $EXPTIME;
+ my $old = $now - $exp;
+ my %new;
+ while (my ($fd, $v) = each %$EXPMAP) {
+ my ($idle_time, $ds_obj) = @$v;
+ if ($idle_time < $old) {
+ if (!$ds_obj->shutdn) {
+ $new{$fd} = $v;
+ }
+ } else {
+ $new{$fd} = $v;
+ }
+ }
+ $EXPMAP = \%new;
+ $exp_timer = scalar(keys %new) ? later(\&expire_old) : undef;
+}
+
+sub update_idle_time {
+ my ($self) = @_;
+ my $sock = $self->{sock} or return;
+ $EXPMAP->{fileno($sock)} = [ now(), $self ];
+ $exp_timer //= later(\&expire_old);
+}
+
+sub not_idle_long {
+ my ($self, $now) = @_;
+ my $sock = $self->{sock} or return;
+ my $ary = $EXPMAP->{fileno($sock)} or return;
+ my $exp_at = $ary->[0] + $EXPTIME;
+ $exp_at > $now;
+}
+