normandy/examples/non_blocking_channel_operations.rb

# https://gobyexample.com/non-blocking-channel-operations

require 'channel'

messages = Channel.new
signals  = Channel.new

Channel.select(messages) do |msg, c|
  case c
  when messages then puts "received message #{msg}"
  else puts 'no message received'
  end
end

msg = 'hi'
messages <- msg
#select {
#case messages <- msg:
#    fmt.Println("sent message", msg)
#default:
#    fmt.Println("no message sent")
#}

Channel.select(messages, signals) do |res, c|
  case c
  when messages then puts "received message #{res}"
  when signals  then puts "received signal #{res}"
  else puts 'no activity'
  end
end