ruby on rails - Easiest way to limit thread count in a loop? -

heroku apparently limits number of threads , issues threaderror (can't create thread (11)) errors when reach limit.

what's easiest way limit number of threads defined limit, say, n? assume loop looks this:

beers.each |abeer|    threads << thread.new(abeer) { |beer|       drink(beer)    } end threads.each { |athread|  athread.join } 

you can use gem ruby-thread, it's thread pool. install gem install thread.

require 'thread/pool' n = 4 pool = thread.pool(n) # count of threads   beers.each |abeer|    pool.process {      drink(abeer)    } end  pool.shutdown