IO::Async::DetachedCode(3) execute code asynchronously in child processes


This object is used indirectly via the "IO::Async::Loop"'s "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 );
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";


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 IO::Async::Function object, for which this is now a wrapper.


$code = $loop->detach_code( %params )

This function returns a new instance of a "IO::Async::DetachedCode" object. The %params hash takes the following keys:
code => CODE
A block of code to call in the child process.
These arguments are no longer used; any values passed will be ignored.
workers => INT
Optional integer, specifies the number of parallel workers to create.

If not supplied, 1 is used.

exit_on_die => BOOL
setup => ARRAY
Passed through to the underlying "IO::Async::Function" object.


$code->call( %params )

Calls one invocation of the contained function code block. See the "call" method on "IO::Async::Function" for more detail.


This method requests that the detached worker processes stop running.

$n_workers = $code->workers

This method in scalar context returns the number of workers currently running.

@worker_pids = $code->workers

This method in list context returns a list of the PID numbers of all the currently running worker processes.


Paul Evans <[email protected]>