Ruby instance_eval

ruby_instance_eval_example.rb

require 'thread'

class Context
  class << self
    def evaluate(&block)
      self.new.instance_eval(&block)
    end
  end
  def self.execute(&block)
    self.new.instance_eval(&block)
  end
  def initialize
    @mutex = Mutex.new
  end 
  def sync(&block)
    @mutex.synchronize{
      yield
    }   
  end 
  def par(no_of_threads=1,&block)
    threads = []
    no_of_threads.times{
      threads << Thread.new{
        yield
      }   
    }   
    threads.each{|t| t.join}
  end 
end

Context.execute {
  par(10) {
    sync {
      puts "test"
    }   
  }
}
Context.evaluate {
  par(10) {
    sync {
      puts "test"
    }   
  }
}