1 files changed, 91 insertions, 0 deletions
diff --git a/sample/drb/simpletuple.rb b/sample/drb/simpletuple.rb
new file mode 100644
index 0000000000..3ae9208c79
--- /dev/null
+++ b/sample/drb/simpletuple.rb
@@ -0,0 +1,91 @@
+#!/usr/local/bin/ruby
+# SimpleTupleSpace
+# Copyright (c) 1999-2000 Masatoshi SEKI
+# You can redistribute it and/or modify it under the same terms as Ruby.
+
+require 'thread'
+
+class SimpleTupleSpace
+  def initialize
+    @hash = {}
+    @waiting = {}
+    @hash.taint
+    @waiting.taint
+    self.taint
+  end
+   
+  def out(key, obj)
+    Thread.critical = true
+    @hash[key] ||= []
+    @waiting[key] ||= []
+    @hash[key].push obj
+    begin
+      t = @waiting[key].shift
+      @waiting.delete(key) if @waiting[key].length == 0
+      t.wakeup if t
+    rescue ThreadError
+      retry
+    ensure
+      Thread.critical = false
+    end
+  end
+
+  def in(key)
+    Thread.critical = true
+    @hash[key] ||= []
+    @waiting[key] ||= []
+    begin
+      loop do
+        if @hash[key].length == 0
+          @waiting[key].push Thread.current
+          Thread.stop
+        else
+          return @hash[key].shift
+        end
+      end
+    ensure
+      @hash.delete(key) if @hash[key].length == 0
+      Thread.critical = false
+    end
+  end
+end  
+
+if __FILE__ == $0
+  ts = SimpleTupleSpace.new
+  clients = []
+  servers = []
+
+  def server(ts)
+    Thread.start {
+      loop do
+	req = ts.in('req')
+	ac = req[0]
+	num = req[1]
+	ts.out(ac, num * num)
+      end
+    }
+  end
+
+  def client(ts, n)
+    Thread.start {
+      ac = Object.new
+      ts.out('req', [ac, n])
+      ans = ts.in(ac)
+      puts "#{n}: #{ans}"
+    }
+  end
+
+  3.times do 
+    servers.push(server(ts))
+  end
+
+  (1..6).each do |n|
+    clients.push(client(ts, n))
+  end
+
+  clients.each do |t|
+    t.join
+  end
+end
+
+