wrong number of parallel threads when number of elements is relatively small compared to degree of parallelism

[awalland]

hi!

thanks a lot for peach, i think it's a great way to parallelize things, but there's a bug when the number of elements to be looped is less than 2*threads:

#!/usr/bin/env ruby

require 'peach'


@max_threads=10
@elements=19

exports = Array.new
puts "start"


$i = 0;
$num = @elements;

while $i < $num  do
    exports.push($i)
   $i +=1;
end

puts "array initialized"

def do_export(num)
    print " |export #{num} "
    %x(sleep 5)
end

puts "max_threads: #{@max_threads}"

exports.peach(@max_threads) do |export|
    do_export(export)
end

this code will execute 19 threads instead of 10.

[petr-tichy]

see #11