NAME

       Mojo::IOLoop::Subprocess - Subprocesses

SYNOPSIS

         use Mojo::IOLoop::Subprocess;

         # Operation that would block the event loop for 5 seconds
         my $subprocess = Mojo::IOLoop::Subprocess->new;
         $subprocess->run(
           sub {
             my $subprocess = shift;
             sleep 5;
             return '♥', 'Mojolicious';
           },
           sub {
             my ($subprocess, $err, @results) = @_;
             say "Subprocess error: $err" and return if $err;
             say "I $results[0] $results[1]!";
           }
         );

         # Start event loop if necessary
         $subprocess->ioloop->start unless $subprocess->ioloop->is_running;

DESCRIPTION

       Mojo::IOLoop::Subprocess allows Mojo::IOLoop to perform computationally expensive
       operations in subprocesses, without blocking the event loop.

ATTRIBUTES

       Mojo::IOLoop::Subprocess implements the following attributes.

   deserialize
         my $cb      = $subprocess->deserialize;
         $subprocess = $subprocess->deserialize(sub {...});

       A callback used to deserialize subprocess return values, defaults to using Storable.

         $subprocess->deserialize(sub {
           my $bytes = shift;
           return [];
         });

   ioloop
         my $loop    = $subprocess->ioloop;
         $subprocess = $subprocess->ioloop(Mojo::IOLoop->new);

       Event loop object to control, defaults to the global Mojo::IOLoop singleton.

   serialize
         my $cb      = $subprocess->serialize;
         $subprocess = $subprocess->serialize(sub {...});

       A callback used to serialize subprocess return values, defaults to using Storable.

         $subprocess->serialize(sub {
           my $array = shift;
           return '';
         });

METHODS

       Mojo::IOLoop::Subprocess inherits all methods from Mojo::Base and implements the following
       new ones.

   pid
         my $pid = $subprocess->pid;

       Process id of the spawned subprocess if available.

   run
         $subprocess = $subprocess->run(sub {...}, sub {...});

       Execute the first callback in a child process and wait for it to return one or more
       values, without blocking "ioloop" in the parent process. Then execute the second callback
       in the parent process with the results. The return values of the first callback and
       exceptions thrown by it, will be serialized with Storable, so they can be shared between
       processes.

SEE ALSO

       Mojolicious, Mojolicious::Guides, <http://mojolicious.org>.