Question

我正在尝试实现一个简单的控制台应用程序，它将执行许多长进程。在这些过程中，我想更新进度我无法找到一个如何在任何地方做到这一点的简单示例！就Ruby知识而言，我仍然“年轻”，而我似乎总能找到关于Thread vs Fibers vs Green Threads等的辩论。

如果有帮助，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!"

Answer 2

变化稍小，您无需阅读互斥锁。

require "thread"

q = Queue.new

Thread.new do # Here we start a new thread
  11.times do |i| # This loops and increases i each time
    q.push(i)
    sleep 1
  end
end

while (i = q.pop) < 10  do
  puts "Counter is #{i}" 
end

puts "Long running process finished!"

Ruby，简单的“线程”示例，用于更新控制台应用程序的进度

2 个答案: