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# You may distribute under the terms of either the GNU General Public License
# or the Artistic License (the same terms as Perl itself)
#
# (C) Paul Evans, 2019-2024 -- leonerd@leonerd.org.uk
package Future::IO::Impl::IOAsync 0.804;
use v5.14;
use warnings;
use base qw( Future::IO::ImplBase );
=head1 NAME
C<Future::IO::Impl::IOAsync> - implement C<Future::IO> using C<IO::Async>
=head1 DESCRIPTION
This module provides an implementation for L<Future::IO> which uses
L<IO::Async>.
There are no additional methods to use in this module; it simply has to be
loaded, and will provide the C<Future::IO> implementation methods.
use Future::IO;
use Future::IO::Impl::IOAsync;
my $f = Future::IO->sleep(5);
...
=cut
use IO::Async::Loop;
__PACKAGE__->APPLY;
my $loop;
sub sleep
{
shift;
my ( $secs ) = @_;
return ( $loop //= IO::Async::Loop->new )->delay_future( after => $secs );
}
my %watching_read_by_fileno; # {fileno} => [@futures]
# Not (yet) part of Future::IO API but it seems a useful way to build this
sub ready_for_read
{
shift;
my ( $fh ) = @_;
my $watching = $watching_read_by_fileno{ $fh->fileno } //= [];
$loop //= IO::Async::Loop->new;
my $f = $loop->new_future;
my $was = scalar @$watching;
push @$watching, $f;
return $f if $was;
$loop->watch_io(
handle => $fh,
on_read_ready => sub {
$watching->[0]->done;
shift @$watching;
return if scalar @$watching;
$loop->unwatch_io(
handle => $fh,
on_read_ready => 1,
);
delete $watching_read_by_fileno{ $fh->fileno };
},
);
return $f;
}
my %watching_write_by_fileno; # {fileno} => [@futures]
sub ready_for_write
{
shift;
my ( $fh ) = @_;
my $watching = $watching_write_by_fileno{ $fh->fileno } //= [];
$loop //= IO::Async::Loop->new;
my $f = $loop->new_future;
my $was = scalar @$watching;
push @$watching, $f;
return $f if $was;
$loop->watch_io(
handle => $fh,
on_write_ready => sub {
$watching->[0]->done;
shift @$watching;
return if scalar @$watching;
$loop->unwatch_io(
handle => $fh,
on_write_ready => 1,
);
delete $watching_write_by_fileno{ $fh->fileno };
},
);
return $f;
}
sub waitpid
{
shift;
my ( $pid ) = @_;
my $f = ( $loop //= IO::Async::Loop->new )->new_future;
$loop->watch_process( $pid, sub {
my ( undef, $wstatus ) = @_;
$f->done( $wstatus );
} );
$f->on_cancel( sub { $loop->unwatch_process( $pid ) } );
return $f;
}
=head1 AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
=cut
0x55AA;
|
