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.\"
.IX Title "IO::Async::DetachedCode 3pm"
.TH IO::Async::DetachedCode 3pm "2012-10-24" "perl v5.14.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
"IO::Async::DetachedCode" \- execute code asynchronously in child processes
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
This object is used indirectly via the \f(CW\*(C`IO::Async::Loop\*(C'\fR's \f(CW\*(C`detach_code\*(C'\fR
method.
.PP
.Vb 2
\& 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\en";
\&    },
\&    on_error => sub {
\&       print STDERR "Cannot determine if it\*(Aqs prime \- $_[0]\en";
\&    },
\& );
\&
\& $loop\->run;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This object class provides a legacy compatibility layer for existing code
that tries to construct such an object. It should not be used for new code;
see instead the IO::Async::Function object, for which this is now a
wrapper.
.SH "CONSTRUCTOR"
.IX Header "CONSTRUCTOR"
.ie n .SS "$code = $loop\->detach_code( %params )"
.el .SS "\f(CW$code\fP = \f(CW$loop\fP\->detach_code( \f(CW%params\fP )"
.IX Subsection "$code = $loop->detach_code( %params )"
This function returns a new instance of a \f(CW\*(C`IO::Async::DetachedCode\*(C'\fR object.
The \f(CW%params\fR hash takes the following keys:
.IP "code => \s-1CODE\s0" 8
.IX Item "code => CODE"
A block of code to call in the child process.
.IP "stream" 8
.IX Item "stream"
.PD 0
.IP "marshaller" 8
.IX Item "marshaller"
.PD
These arguments are no longer used; any values passed will be ignored.
.IP "workers => \s-1INT\s0" 8
.IX Item "workers => INT"
Optional integer, specifies the number of parallel workers to create.
.Sp
If not supplied, 1 is used.
.IP "exit_on_die => \s-1BOOL\s0" 8
.IX Item "exit_on_die => BOOL"
.PD 0
.IP "setup => \s-1ARRAY\s0" 8
.IX Item "setup => ARRAY"
.PD
Passed through to the underlying \f(CW\*(C`IO::Async::Function\*(C'\fR object.
.SH "METHODS"
.IX Header "METHODS"
.ie n .SS "$code\->call( %params )"
.el .SS "\f(CW$code\fP\->call( \f(CW%params\fP )"
.IX Subsection "$code->call( %params )"
Calls one invocation of the contained function code block. See the \f(CW\*(C`call\*(C'\fR
method on \f(CW\*(C`IO::Async::Function\*(C'\fR for more detail.
.ie n .SS "$code\->shutdown"
.el .SS "\f(CW$code\fP\->shutdown"
.IX Subsection "$code->shutdown"
This method requests that the detached worker processes stop running.
.ie n .SS "$n_workers = $code\->workers"
.el .SS "\f(CW$n_workers\fP = \f(CW$code\fP\->workers"
.IX Subsection "$n_workers = $code->workers"
This method in scalar context returns the number of workers currently running.
.ie n .SS "@worker_pids = $code\->workers"
.el .SS "\f(CW@worker_pids\fP = \f(CW$code\fP\->workers"
.IX Subsection "@worker_pids = $code->workers"
This method in list context returns a list of the \s-1PID\s0 numbers of all the
currently running worker processes.
.SH "AUTHOR"
.IX Header "AUTHOR"
Paul Evans <leonerd@leonerd.org.uk>