use AnyEvent;



   # if you prefer function calls, look at the AE manpage for

   # an alternative API.



   # file handle or descriptor readable

   my $w = AnyEvent->io (fh => $fh, poll => "r", cb => sub { ...  });



   # one-shot or repeating timers

   my $w = AnyEvent->timer (after => $seconds, cb => sub { ...  });

   my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ...);



   print AnyEvent->now;  # prints current event loop time

   print AnyEvent->time; # think Time::HiRes::time or simply CORE::time.



   # POSIX signal

   my $w = AnyEvent->signal (signal => "TERM", cb => sub { ... });



   # child process exit

   my $w = AnyEvent->child (pid => $pid, cb => sub {

      my ($pid, $status) = @_;

      ...

   });



   # called when event loop idle (if applicable)

   my $w = AnyEvent->idle (cb => sub { ... });



   my $w = AnyEvent->condvar; # stores whether a condition was flagged

   $w->send; # wake up current and all future recv's

   $w->recv; # enters "main loop" till $condvar gets ->send

   # use a condvar in callback mode:

   $w->cb (sub { $_[0]->recv });