Test script demonstrating Nokogiri thread safety

gistfile1.rb

require 'open-uri'
require 'nokogiri'

MS_ARRAY_SCHEMA = "http://schemas.microsoft.com/2003/10/Serialization/Arrays".freeze

def job
  begin
    data = Nokogiri::XML(open("file.xml"))
    rows = data.xpath(".//xmlns:ArrayOfTicket/xmlns:Ticket")
    rows.each do |row|
      row.xpath(".//xmlns:Id").first
      row.xpath(".//xmlns:DisplayPrice").first
      row.xpath(".//xmlns:AvailableBlocks").first.xpath("a:int", {"a" => MS_ARRAY_SCHEMA}).collect{|elem| elem.text.to_i}
    end
    puts "OK"
  rescue Nokogiri::XML::XPath::SyntaxError => ex    
    puts "XPath Syntax Error: #{ex}"
  end
end

threads = (0...100).to_a.map {Thread.new {job}}
threads.each {|t| t.join}