/usr/share/perl5/Mojo/Reactor/Poll.pm is in libmojolicious-perl 5.54+dfsg-1.
This file is owned by root:root, with mode 0o644.
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use Mojo::Base 'Mojo::Reactor';
use IO::Poll qw(POLLERR POLLHUP POLLIN POLLOUT POLLPRI);
use List::Util 'min';
use Mojo::Util qw(md5_sum steady_time);
use Time::HiRes 'usleep';
sub again {
my $timer = shift->{timers}{shift()};
$timer->{time} = steady_time + $timer->{after};
}
sub io {
my ($self, $handle, $cb) = @_;
$self->{io}{fileno $handle} = {cb => $cb};
return $self->watch($handle, 1, 1);
}
sub is_running { !!shift->{running} }
sub one_tick {
my $self = shift;
# Remember state for later
my $running = $self->{running};
$self->{running} = 1;
# Wait for one event
my $i;
my $poll = $self->_poll;
until ($i) {
# Stop automatically if there is nothing to watch
return $self->stop unless keys %{$self->{timers}} || keys %{$self->{io}};
# Calculate ideal timeout based on timers
my $min = min map { $_->{time} } values %{$self->{timers}};
my $timeout = defined $min ? ($min - steady_time) : 0.5;
$timeout = 0 if $timeout < 0;
# I/O
if (keys %{$self->{io}}) {
$poll->poll($timeout);
for my $handle ($poll->handles(POLLIN | POLLPRI | POLLHUP | POLLERR)) {
next unless my $io = $self->{io}{fileno $handle};
++$i and $self->_sandbox('Read', $io->{cb}, 0);
}
for my $handle ($poll->handles(POLLOUT)) {
next unless my $io = $self->{io}{fileno $handle};
++$i and $self->_sandbox('Write', $io->{cb}, 1);
}
}
# Wait for timeout if poll can't be used
elsif ($timeout) { usleep $timeout * 1000000 }
# Timers (time should not change in between timers)
my $now = steady_time;
for my $id (keys %{$self->{timers}}) {
next unless my $t = $self->{timers}{$id};
next unless $t->{time} <= $now;
# Recurring timer
if (exists $t->{recurring}) { $t->{time} = $now + $t->{recurring} }
# Normal timer
else { $self->remove($id) }
++$i and $self->_sandbox("Timer $id", $t->{cb}) if $t->{cb};
}
}
# Restore state if necessary
$self->{running} = $running if $self->{running};
}
sub recurring { shift->_timer(1, @_) }
sub remove {
my ($self, $remove) = @_;
return !!delete $self->{timers}{$remove} unless ref $remove;
$self->_poll->remove($remove);
return !!delete $self->{io}{fileno $remove};
}
sub reset { delete @{shift()}{qw(io poll timers)} }
sub start {
my $self = shift;
$self->{running}++;
$self->one_tick while $self->{running};
}
sub stop { delete shift->{running} }
sub timer { shift->_timer(0, @_) }
sub watch {
my ($self, $handle, $read, $write) = @_;
my $mode = 0;
$mode |= POLLIN | POLLPRI if $read;
$mode |= POLLOUT if $write;
my $poll = $self->_poll;
$poll->remove($handle);
$poll->mask($handle, $mode) if $mode != 0;
return $self;
}
sub _poll { shift->{poll} ||= IO::Poll->new }
sub _sandbox {
my ($self, $event, $cb) = (shift, shift, shift);
eval { $self->$cb(@_); 1 } or $self->emit(error => "$event failed: $@");
}
sub _timer {
my ($self, $recurring, $after, $cb) = @_;
my $timers = $self->{timers} //= {};
my $id;
do { $id = md5_sum('t' . steady_time . rand 999) } while $timers->{$id};
my $timer = $timers->{$id}
= {cb => $cb, after => $after, time => steady_time + $after};
$timer->{recurring} = $after if $recurring;
return $id;
}
1;
=encoding utf8
=head1 NAME
Mojo::Reactor::Poll - Low-level event reactor with poll support
=head1 SYNOPSIS
use Mojo::Reactor::Poll;
# Watch if handle becomes readable or writable
my $reactor = Mojo::Reactor::Poll->new;
$reactor->io($handle => sub {
my ($reactor, $writable) = @_;
say $writable ? 'Handle is writable' : 'Handle is readable';
});
# Change to watching only if handle becomes writable
$reactor->watch($handle, 0, 1);
# Add a timer
$reactor->timer(15 => sub {
my $reactor = shift;
$reactor->remove($handle);
say 'Timeout!';
});
# Start reactor if necessary
$reactor->start unless $reactor->is_running;
=head1 DESCRIPTION
L<Mojo::Reactor::Poll> is a low-level event reactor based on L<IO::Poll>.
=head1 EVENTS
L<Mojo::Reactor::Poll> inherits all events from L<Mojo::Reactor>.
=head1 METHODS
L<Mojo::Reactor::Poll> inherits all methods from L<Mojo::Reactor> and
implements the following new ones.
=head2 again
$reactor->again($id);
Restart active timer.
=head2 io
$reactor = $reactor->io($handle => sub {...});
Watch handle for I/O events, invoking the callback whenever handle becomes
readable or writable.
=head2 is_running
my $bool = $reactor->is_running;
Check if reactor is running.
=head2 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.
=head2 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.
=head2 remove
my $bool = $reactor->remove($handle);
my $bool = $reactor->remove($id);
Remove handle or timer.
=head2 reset
$reactor->reset;
Remove all handles and timers.
=head2 start
$reactor->start;
Start watching for I/O and timer events, this will block until L</"stop"> is
called or no events are being watched anymore.
=head2 stop
$reactor->stop;
Stop watching for I/O and timer events.
=head2 timer
my $id = $reactor->timer(0.5 => sub {...});
Create a new timer, invoking the callback after a given amount of time in
seconds.
=head2 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.
=head1 SEE ALSO
L<Mojolicious>, L<Mojolicious::Guides>, L<http://mojolicio.us>.
=cut
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