/usr/share/perl5/IO/Async/DetachedCode.pm is in libio-async-perl 0.45-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# or the Artistic License (the same terms as Perl itself)
#
# (C) Paul Evans, 2007-2011 -- leonerd@leonerd.org.uk
package IO::Async::DetachedCode;
use strict;
use warnings;
our $VERSION = '0.45';
use Carp;
use IO::Async::Function;
=head1 NAME
C<IO::Async::DetachedCode> - execute code asynchronously in child processes
=head1 SYNOPSIS
This object is used indirectly via the C<IO::Async::Loop>'s C<detach_code>
method.
use IO::Async::Loop;
my $loop = IO::Async::Loop->new;
my $code = $loop->detach_code(
code => sub {
my ( $number ) = @_;
return is_prime( $number );
}
);
$code->call(
args => [ 123454321 ],
on_return => sub {
my $isprime = shift;
print "123454321 " . ( $isprime ? "is" : "is not" ) . " a prime number\n";
},
on_error => sub {
print STDERR "Cannot determine if it's prime - $_[0]\n";
},
);
$loop->loop_forever;
=head1 DESCRIPTION
This object class provides a legacy compatibility layer for existing code
that tries to construct such an object. It should not be used for new code;
see instead the L<IO::Async::Function> object, for which this is now a
wrapper.
=cut
=head1 CONSTRUCTOR
=cut
=head2 $code = $loop->detach_code( %params )
This function returns a new instance of a C<IO::Async::DetachedCode> object.
The C<%params> hash takes the following keys:
=over 8
=item code => CODE
A block of code to call in the child process.
=item stream
=item marshaller
These arguments are no longer used; any values passed will be ignored.
=item workers => INT
Optional integer, specifies the number of parallel workers to create.
If not supplied, 1 is used.
=item exit_on_die => BOOL
=item setup => ARRAY
Passed through to the underlying C<IO::Async::Function> object.
=back
=cut
sub new
{
my $class = shift;
my ( %params ) = @_;
my $loop = delete $params{loop} or croak "Expected a 'loop'";
# No-longer supported args
delete $params{marshaller};
delete $params{stream};
my $workers = delete $params{workers} || 1;
my $function = IO::Async::Function->new(
min_workers => $workers,
max_workers => $workers,
%params,
);
$loop->add( $function );
return bless {
function => $function,
}, $class;
}
sub DESTROY
{
my $self = shift;
my $function = $self->{function};
$function->loop->remove( $function );
}
=head1 METHODS
=cut
=head2 $code->call( %params )
Calls one invocation of the contained function code block. See the C<call>
method on C<IO::Async::Function> for more detail.
=cut
sub call
{
my $self = shift;
$self->{function}->call( @_ );
}
=head2 $code->shutdown
This method requests that the detached worker processes stop running.
=cut
sub shutdown
{
my $self = shift;
$self->{function}->stop;
}
=head2 $n_workers = $code->workers
This method in scalar context returns the number of workers currently running.
=head2 @worker_pids = $code->workers
This method in list context returns a list of the PID numbers of all the
currently running worker processes.
=cut
sub workers
{
my $self = shift;
# Lots of cheating here
# Works in scalar or list
return keys %{ $self->{function}{workers} };
}
=head1 AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
=cut
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