NAME

   Mojo::Reactor::Epoll - epoll backend for Mojo::Reactor

SYNOPSIS

     use Mojo::Reactor::Epoll;

     # Watch if handle becomes readable or writable
     my $reactor = Mojo::Reactor::Epoll->new;
     $reactor->io($first => sub {
       my ($reactor, $writable) = @_;
       say $writable ? 'First handle is writable' : 'First handle is readable';
     });

     # Change to watching only if handle becomes writable
     $reactor->watch($first, 0, 1);

     # Turn file descriptor into handle and watch if it becomes readable
     my $second = IO::Handle->new_from_fd($fd, 'r');
     $reactor->io($second => sub {
       my ($reactor, $writable) = @_;
       say $writable ? 'Second handle is writable' : 'Second handle is readable';
     })->watch($second, 1, 0);

     # Add a timer
     $reactor->timer(15 => sub {
       my $reactor = shift;
       $reactor->remove($first);
       $reactor->remove($second);
       say 'Timeout!';
     });

     # Start reactor if necessary
     $reactor->start unless $reactor->is_running;

     # Or in an application using Mojo::IOLoop
     use Mojo::Reactor::Epoll;
     use Mojo::IOLoop;

     # Or in a Mojolicious application
     $ MOJO_REACTOR=Mojo::Reactor::Epoll hypnotoad script/myapp

DESCRIPTION

   Mojo::Reactor::Epoll is an event reactor for Mojo::IOLoop that uses the
   epoll(7) Linux subsystem. The usage is exactly the same as other
   Mojo::Reactor implementations such as Mojo::Reactor::Poll.
   Mojo::Reactor::Epoll will be used as the default backend for
   Mojo::IOLoop if it is loaded before Mojo::IOLoop or any module using
   the loop. However, when invoking a Mojolicious application through
   morbo or hypnotoad, the reactor must be set as the default by setting
   the MOJO_REACTOR environment variable to Mojo::Reactor::Epoll.

EVENTS

   Mojo::Reactor::Epoll inherits all events from Mojo::Reactor.

METHODS

   Mojo::Reactor::Epoll inherits all methods from Mojo::Reactor and
   implements the following new ones.

again

     $reactor->again($id);

   Restart timer. Note that this method requires an active timer.

io

     $reactor = $reactor->io($handle => sub {...});

   Watch handle for I/O events, invoking the callback whenever handle
   becomes readable or writable.

     # Callback will be invoked twice if handle becomes readable and writable
     $reactor->io($handle => sub {
       my ($reactor, $writable) = @_;
       say $writable ? 'Handle is writable' : 'Handle is readable';
     });

is_running

     my $bool = $reactor->is_running;

   Check if reactor is running.

next_tick

     my $undef = $reactor->next_tick(sub {...});

   Invoke callback as soon as possible, but not before returning or other
   callbacks that have been registered with this method, always returns
   undef.

one_tick

     $reactor->one_tick;

   Run reactor until an event occurs or no events are being watched
   anymore. Note that this method can recurse back into the reactor, so
   you need to be careful.

     # Don't block longer than 0.5 seconds
     my $id = $reactor->timer(0.5 => sub {});
     $reactor->one_tick;
     $reactor->remove($id);

recurring

     my $id = $reactor->recurring(0.25 => sub {...});

   Create a new recurring timer, invoking the callback repeatedly after a
   given amount of time in seconds.

remove

     my $bool = $reactor->remove($handle);
     my $bool = $reactor->remove($id);

   Remove handle or timer.

reset

     $reactor->reset;

   Remove all handles and timers.

start

     $reactor->start;

   Start watching for I/O and timer events, this will block until "stop"
   is called or no events are being watched anymore.

     # Start reactor only if it is not running already
     $reactor->start unless $reactor->is_running;

stop

     $reactor->stop;

   Stop watching for I/O and timer events.

timer

     my $id = $reactor->timer(0.5 => sub {...});

   Create a new timer, invoking the callback after a given amount of time
   in seconds.

watch

     $reactor = $reactor->watch($handle, $readable, $writable);

   Change I/O events to watch handle for with true and false values. Note
   that this method requires an active I/O watcher.

     # Watch only for readable events
     $reactor->watch($handle, 1, 0);

     # Watch only for writable events
     $reactor->watch($handle, 0, 1);

     # Watch for readable and writable events
     $reactor->watch($handle, 1, 1);

     # Pause watching for events
     $reactor->watch($handle, 0, 0);

CAVEATS

   The epoll notification facility is exclusive to Linux systems.

   The epoll handle is not usable across forks, and this is not currently
   managed for you, though it is not created until the loop is started to
   allow for preforking deployments such as hypnotoad.

BUGS

   Report any issues on the public bugtracker.

AUTHOR

   Dan Book, [email protected]

COPYRIGHT AND LICENSE

   Copyright 2015, Dan Book.

   This library is free software; you may redistribute it and/or modify it
   under the terms of the Artistic License version 2.0.

SEE ALSO

   Mojolicious, Mojo::IOLoop, Linux::Epoll

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