resource_pool

  require 'resource_pool'

  memcache_pool = ResourcePool.new({
      :max_size => 10,                  # Max amount of resource allowed to create. Default is 4
      :pool_timeout => 4,               # Seconds to wait when aquiring a free resource.
                                        # Set to 0 to skip waiting. Default is 2
      :pool_sleep_time => 0.1,          # Seconds to wait for retry aquiring resource. Default is 0.001
      :delete_proc => lambda{ |res| }   # a proc used to close / delete the resource. Optional
  }) do
    # create your resource here.
    # A resource can be anything such as TCP, persistent HTTP, database, nosql
    # Note: must return the instantiated resource
    Memcache.new MemCache.new 'host:11211'
  end

  # using defaults for redis pool
  redis_pool = ResourcePool.new do
    Redis.new(:host => "10.0.1.1", :port => 6380)
  end

  # Use the resource:
  threads = []
  50.times do
    thread = Thread.new do
      # there are 4 redis connections
      # can now be shared safely with 50 threads
      redis_pool.hold do |redis|
        redis.set "foo", "bar"
        redis.get "foo"
      end
    end
    threads << thread
  end

  threads.each(&:join)