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=head1 NAME |
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AnyEvent::Fork::Early - avoid having to exec another perl interpreter |
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=head1 SYNOPSIS |
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# only usable in the main program, and must be called |
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# as early as possible |
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#!/usr/bin/perl |
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use AnyEvent::Fork::Early; |
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# now you can do other stuff |
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=head1 DESCRIPTION |
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L<AnyEvent::Fork> normally spawns a new perl process by executing the perl |
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binary. It does this because it is the only way to get a "clean state", as |
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the program using it might have loaded modules that are not fork friendly |
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(event loops, X11 interfaces and so on). |
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However, in some cases, there is no external perl interpreter to execute, |
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for example, when you use L<App::Staticperl> or L<PAR::Packer> to embed |
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perl into another program, and that program runs on another system without |
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perl installed. |
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And anyway, forking would still be more efficient, if it were possible. |
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And, as you hopefully guessed, this module makes this possible - it must |
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be run by the main program (i.e. to cannot be used in a module), and as |
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early as possible. How early? Well, early enough so that any other modules |
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can still be loaded and used, that is, before modules such as AnyEvent or |
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Gtk2 are being initialised. |
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Upon C<use>'ing the module, the process is forked, and the resulting |
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process is used as a template process for C<new> and C<new_exec>, so |
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everything should just work out. |
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Please resist the temptation to delay C<use>ing this module to |
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preload more modules that could be useful for your own purposes, see |
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L<AnyEvent::Fork::Template> for that. |
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=cut |
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package AnyEvent::Fork::Early; |
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# load stuff we need anyways |
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use AnyEvent::Fork (); |
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# this does not work on win32, due to the atrociously bad fake perl fork |
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unless ($^O eq "MSWin32") { |
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# we preload certain modules because sooner or later, somebody will use them. |
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# complain to me if that causes trouble. |
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require common::sense; |
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require strict; |
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require warnings; |
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require feature if $] >= 5.010; |
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require Carp; |
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require IO::FDPass; |
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$AnyEvent::Fork::TEMPLATE = |
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$AnyEvent::Fork::EARLY = AnyEvent::Fork->_new_fork ("AnyEvent::Fork::Early"); |
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} |
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1.1 |
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=head1 AUTHOR |
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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=cut |
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