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#!/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
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