This code sends a message around a ring of queues. When each queue
pops, it prints out its message.
The code seems to work, but it seems to hang on the io, which I don't
understand. I would expect the messages to print very quickly. The
messages only print inside of irb when I depress the carriage return
repeatedly.
Thank you!
Jeff
···
=================================
require 'thread'
class Ring
attr_writer :size, :mbox, :agents
attr_reader :size, :mbox, :agents
def initialize (size)
@size = size
@mbox = []
@agents = []
(1..size).each do
@mbox << Queue.new
end
(0..size-1).each do |index|
@agents << Thread.new(index) do |i|
loop do
msg = @mbox[i].pop
case msg
when "start"
@mbox[(i+1)%size] << 1 if i == 0
when "halt"
break
else
print("#{i}: #{msg}: #{Thread.current} #{Time.now}\n")
STDOUT.flush
(@mbox[(i+1)%size] << msg + 1) if i!=0
Thread.pass
end
end
end
end
end
def rpc(i, msg)
@mbox[i] << msg
end
def start ()
rpc(0,"start")
end
def halt ()
@mbox.each { |m| m << "halt" }
@agents.each {|thr| thr.join }
end
end
R = Ring.new(10)
R.start
Attachments:
http://www.ruby-forum.com/attachment/1266/ring.rb
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