Ruby线程互斥

Mutex(Mutal Exclusion = 互斥锁)是一种用于多线程编程中，防止两条线程同时对同一公共资源（比如全局变量）进行读写的机制。

不使用Mutax的实例

#!/usr/bin/ruby -w
# -*- coding : utf-8 -*-
puts "HaiCoder(www.haicoder.net)"
require 'thread'
count1 = count2 = 0
difference = 0
counter = Thread.new do
   loop do
      count1 += 1
      count2 += 1
   end
end
spy = Thread.new do
   loop do
      difference += (count1 - count2).abs
   end
end
sleep 1
puts "count1 :  #{count1}"
puts "count2 :  #{count2}"
puts "difference : #{difference}"

以上实例运行输出结果为：

使用mutex的实例

#!/usr/bin/ruby -w
# -*- coding : utf-8 -*-
puts "HaiCoder(www.haicoder.net)"
require 'thread'
mutex = Mutex.new
count1 = count2 = 0
difference = 0
counter = Thread.new do
   loop do
      mutex.synchronize do
         count1 += 1
         count2 += 1
      end
    end
end
spy = Thread.new do
   loop do
       mutex.synchronize do
          difference += (count1 - count2).abs
       end
   end
end
sleep 1
mutex.lock
puts "count1 :  #{count1}"
puts "count2 :  #{count2}"
puts "difference : #{difference}"

以上实例运行输出结果为：