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#! /usr/bin/ruby
require 'thread'
class LocalBarrier
def initialize(n)
@wait = Queue.new
@done = Queue.new
@keeper = begin_keeper(n)
end
def sync
@done.push(true)
@wait.pop
end
def join
@keeper.join
end
private
def begin_keeper(n)
Thread.start do
n.times do
@done.pop
end
n.times do
@wait.push(true)
end
end
end
end
n = 10
lb = LocalBarrier.new(n)
(n - 1).times do |i|
Thread.start do
sleep((rand(n) + 1) / 10.0)
puts "#{i}: done"
lb.sync
puts "#{i}: cont"
end
end
lb.sync
puts "#{n-1}: done"
# lb.join # leaving waiting threads.
puts "exit."
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