In your code, you create the callback timer and immediately discard it, which prevents the timer from ever getting called:
sub {
...
my $w = AnyEvent->timer(
after => 0,
interval => 5,
cb => sub {
$session->write('5 seconds have passed');
$w_cond->send();
}
};
}
You need to keep $w alive until the timer has fired. The easiest way is the following pattern:
...
my $w; $w = AnyEvent->timer(
after => 0,
interval => 5,
cb => sub {
undef $w; # cleanup!
$session->write('5 seconds have passed');
$w_cond->send();
}
};
...
That way, the timer stays alive until it has fired.
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