perl - http::proxy module engine -

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i have question cpan module http://search.cpan.org/dist/http-proxy/

it seems module support engines

could explain me difference between:

    use http::proxy;     $proxy = http::proxy->new( engine => 'nofork' );

and :

    use http::proxy;     $proxy = http::proxy->new;

and: 

   use http::proxy;    $proxy = http::proxy->new( engine => scoreboard );

to quote http::proxy::engine pod

the role of engine implement main fork+serve loop required bookkeeping. way test various implementation and/or try out new algorithms without difficulties.

the descriptions of various engines are:

http::proxy::engine::legacy - "older" http::proxy engine
http::proxy::engine::nofork - basic, non forking http::proxy engine
http::proxy::engine::scoreboard -a scoreboard-based http::proxy engine

note: last 1 seems implementing "scoreboard" dynamic scheduling algorithm (which used cpu instruction sceduling). in case it's more simplified, , scoreboard - glancing @ source - appears list of statuses of each forked off child process


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