03-25-2004
> Is there a way to accomplishing this after all the child processes are created via a call to fork().
No. Unless child and parent explicitly define a protocol to control such things on a voluntary basis, e.g. the parent to could send a certain signal to a child in order to have it react in a pre-defined manner.
Given that all your target processes are children, the parent could create a pipe with each of them and send a signal whenever you've just sent a command down the pipe. The children would check the state of the pipe whenever the signal arrives and take appropriate actions. Of course, this might not be the best way depending on your requirements (apparently you don't seem to know what you want either), but it's a pretty asynchronous one.
Other than that, you could in theory kludge your own machine code into the child's text segment e.g. by using ptrace() or /proc/<pid>/mem or somesuch, but this is hardly applicable, so I'd guess you want to do the former.
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Child(3pm) User Contributed Perl Documentation Child(3pm)
NAME
Child - Object oriented simple interface to fork()
DESCRIPTION
Fork is too low level, and difficult to manage. Often people forget to exit at the end, reap their children, and check exit status. The
problem is the low level functions provided to do these things. Throw in pipes for IPC and you just have a pile of things nobody wants to
think about.
Child is an Object Oriented interface to fork. It provides a clean way to start a child process, and manage it afterwords. It provides
methods for running, waiting, killing, checking, and even communicating with a child process.
NOTE: kill() is unpredictable on windows, strawberry perl sends the kill signal to the parent as well as the child.
SYNOPSIS
BASIC
use Child;
my $child = Child->new(sub {
my ( $parent ) = @_;
....
# exit() is called for you at the end.
});
my $proc = $child->start
# Kill the child if it is not done
$proc->complete || $proc->kill(9);
$proc->wait; #blocking
IPC
# Build with IPC
my $child2 = Child->new(sub {
my $self = shift;
$self->say("message1");
$self->say("message2");
my $reply = $self->read(1);
}, pipe => 1 );
my $proc2 = $child2->start;
# Read (blocking)
my $message1 = $proc2->read();
my $message2 = $proc2->read();
$proc2->say("reply");
SHORTCUT
Child can export the child() shortcut function when requested. This function creates and starts the child process in one action.
use Child qw/child/;
my $proc = child {
my $parent = shift;
...
};
You can also request IPC:
use Child qw/child/;
my $child = child {
my $parent = shift;
...
} pipe => 1;
DETAILS
First you define a child, you do this by constructing a Child object. Defining a child does not start a new process, it is just the way to
define what the new process will look like. Once you have defined the child you can start the process by calling $child->start(). One child
object can start as many processes as you like.
When you start a child an Child::Link::Proc object is returned. This object provides multiple useful methods for interacting with your
process. Within the process itself an Child::Link::Parent is created and passed as the only parameter to the function used to define the
child. The parent object is how the child interacts with its parent.
PROCESS MANAGEMENT METHODS
@procs = Child->all_procs()
Get a list of all the processes that have been started. This list is cleared in processes when they are started; that is a child will
not list its siblings.
@pids = Child->all_proc_pids()
Get a list of all the pids of processes that have been started.
Child->wait_all()
Call wait() on all processes.
EXPORTS
$proc = child( sub { ... } )
$proc = child { ... }
$proc = child( sub { ... }, $plugin, @data )
$proc = child { ... } $plugin => @data
Create and start a process in one action.
CONSTRUCTOR
$child = Child->new( sub { ... } )
$child = Child->new( sub { ... }, $plugin, @plugin_data )
Create a new Child object. Does not start the child.
OBJECT METHODS
$proc = $child->start()
Start the child process.
SEE ALSO
Child::Link::Proc
The proc object that is returned by $child->start()
Child::Link::Parent
The parent object that is provided as the argumunt to the function used to define the child.
Child::Link::IPC
The base class for IPC plugin link objects. This provides the IPC methods.
HISTORY
Most of this was part of Parrallel::Runner intended for use in the Fennec project. Fennec is being broken into multiple parts, this is one
such part.
FENNEC PROJECT
This module is part of the Fennec project. See Fennec for more details. Fennec is a project to develop an extendable and powerful testing
framework. Together the tools that make up the Fennec framework provide a potent testing environment.
The tools provided by Fennec are also useful on their own. Sometimes a tool created for Fennec is useful outside the greator framework.
Such tools are turned into their own projects. This is one such project.
Fennec - The core framework
The primary Fennec project that ties them all together.
AUTHORS
Chad Granum exodist7@gmail.com
COPYRIGHT
Copyright (C) 2010 Chad Granum
Child is free software; Standard perl licence.
Child is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the license for more details.
perl v5.10.1 2011-03-07 Child(3pm)