Ruby，简单的 "threading"示例，用于更新控制台应用程序中的进度

Question

我正在尝试实现一个简单的控制台应用程序，该应用程序将执行许多长流程。在这些过程中我想更新进度。
我无法在任何地方找到如何执行此操作的简单示例!
就 Ruby 知识而言，我仍然“年轻”，我似乎能找到的只是关于线程、纤维、绿色线程等的争论。

如果有帮助的话，我正在使用 Ruby 1.9.2。

Answer 1

th = Thread.new do # Here we start a new thread
  Thread.current['counter']=0
  11.times do |i| # This loops and increases i each time
    Thread.current['counter']=i
    sleep 1
  end
  return nil
end

while th['counter'].to_i < 10  do
# th is the long running thread and we can access the same variable as from inside the thread here
# keep in mind that this is not a safe way of accessing thread variables, for reading status information
# this works fine though. Read about Mutex to get a better understanding.
  puts "Counter is #{th['counter']}" 
  sleep 0.5
end

puts "Long running process finished!"