---
name: "Mojo::Reactor::Poll"
section: "3pm"
platform: "linux"
package: "libmojolicious-perl"
version: "9.39+dfsg-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Mojo::Reactor::Poll"
---

# Mojo::Reactor::Poll(3pm)

Low-level event reactor with poll support

## NAME

Mojo::Reactor::Poll - Low-level event reactor with poll support

## SYNOPSIS

```
  use Mojo::Reactor::Poll;
  # Watch if handle becomes readable or writable
  my $reactor = Mojo::Reactor::Poll->new;
  $reactor->io($first => sub ($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 ($reactor, $writable) {
    say $writable ? 'Second handle is writable' : 'Second handle is readable';
  })->watch($second, 1, 0);
  # Add a timer
  $reactor->timer(15 => sub ($reactor) {
    $reactor->remove($first);
    $reactor->remove($second);
    say 'Timeout!';
  });
  # Start reactor if necessary
  $reactor->start unless $reactor->is_running;
```

## DESCRIPTION

Mojo::Reactor::Poll is a low-level event reactor based on IO::Poll.

## EVENTS

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

## METHODS

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

### again

```
  $reactor->again($id);
  $reactor->again($id, 0.5);
```

Restart timer and optionally change the invocation time. 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 executed twice if handle becomes readable and writable
  $reactor->io($handle => sub ($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 {...});
```

Execute 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.

```
  # 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);
```

## SEE ALSO

Mojolicious, Mojolicious::Guides, \<https://mojolicious.org\>.