You have to share each hash and array. You don't have to share the values you put into the hash/array.

So, I believe these two lines should be dropped:

share ( $hash{$file}{start} ); # for pulling start time from file
share ( $hash{$file}{stop} ); # for pulling stop time from file
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More importantly, the second lines needs to be done more like the first line:

$hash{$file} = &share({});
share ( $hash{$file}{certain_row_type}->[$i] );
$hash{$file}{certain_row_type}->[$i] = $line;
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So, something more like:

    $hash{$file} = &share( {} );
    $hash{$file}{row_type} = &share( [] );
    $hash{$file}{row_type}[$i] = $line;
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