in reply to Re^2: Parallel::ForkManager and multiple datasets
in thread Parallel::ForkManager and multiple datasets

Replace 

%list = $data_structure_reference->{data1};

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with 

%list = %{ $data_structure_reference->{data1} };

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and replace 

$pfm->finish( 0, { data1 => %id,

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with 

$pfm->finish( 0, { data1 => \%id,

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In Section Seekers of Perl Wisdom