file io - How to handle thread returns Ruby -

i have ruby script in i'm parsing large csv file. ihave handled , working well, except how deal thread's return values. have:

length = (ses.size/4).ceil ses.each_slice(length) |x|     threads << thread.new { a,b = splat x } end  threads.each { |thr|     thr.join } 

'splat' returns temp files need appended output files out1 , out2. i'm stumbling on that/how information. if point me in right direction that'd great.

two things, first, when pass 'x' thread, it's safer make thread-local changing this:

threads << thread.new { a,b = splat x } 

into this:

threads << thread.new(x) { |x| a,b = splat x } 

next, return value out, join using :value.

so here's quick demo whipped up:

dummy = [   ['a.txt', 'b.txt'],   ['c.txt', 'd.txt'],   ['e.txt', 'f.txt'],   ['g.txt', 'h.txt'],   ['i.txt', 'j.txt'],   ['k.txt', 'l.txt'] ]  threads = dummy.map |pair|   thread.new(pair) { |val| val } end  vals = threads.map(&:value) # equiv. 'threads.map { |t| t.value }' puts vals.inspect 

crib off , should want go.