multithreading - Threads in Ruby -

why code work (i see output 1 2 3):

for in 1..3     thread.new{         puts     } end 

however, following code not produce same output (i not see output 1 2 3)?

for in 1..3     thread.new{         sleep(5)         puts     } end 

when hit end of script, ruby exits. if add sleep 10 after final loop, can see output show up. (albeit, 3 each time, because binding i reflects value @ end of processing, , sleep causes thread switch loop.)

you might want like:

threads = [] in 1..3   threads << thread.new {     sleep 5     puts   } end threads.map {|t| t.join } 

that wait threads terminate before exiting.