From: Earle Clubb <eclubb@...>
Date: 2008-07-22T04:12:46+09:00
Subject: Thread-local global variables?

Is it possible to define a variable whose value is global within a
particular each thread (including the main thread), yet distinct between
threads?  For example, I've tried this:

$abc = 0

threads = []
2.times do |i|
  threads << Thread.new(i+1) do |i|
    $abc = i
    10.times do
      print "thread #{i}: abc = #{$abc}\n"
      sleep 0.5
    end
  end
end

10.times do
  print "thread 0: abc = #{$abc}\n"
  sleep 0.5
end

threads.each {|t| t.join}


Of course it prints:

thread 1: abc = 1
thread 2: abc = 2
thread 0: abc = 2
thread 1: abc = 2
thread 0: abc = 2
thread 2: abc = 2
thread 0: abc = 2
thread 2: abc = 2
thread 1: abc = 2
...

Is there any way to do this so that it prints like this?

thread 1: abc = 1
thread 2: abc = 2
thread 0: abc = 0
thread 1: abc = 1
thread 0: abc = 0
thread 2: abc = 2
thread 0: abc = 0
thread 2: abc = 2
thread 1: abc = 1
...

Thanks,
Earle
-- 
Posted via http://www.ruby-forum.com/.