>_<.

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require 'ObjectPool'
require 'thread'

class ThreadPool
    private
    class WorkerCteator < ObjectPoolCreator
        def create
            Worker.new
        end
    end

    class WorkerPool < ObjectPool
        def initialize(creator, config)
            super creator, config
        end    
    end
    
    class Worker
        def initialize
            @job = nil
            @mutex = Mutex.new
            
            @thread = Thread.new do
                while true
                    if @job == nil
                        sleep 0.001
                    else
                        @mutex.synchronize { @job.call; @job = nil; }
                    end
                end
            end
        end
        
        def job=(job)
            @mutex.synchronize { @job = job }
        end
        
        def free?
            @job.nil?
        end
    end

    public
    def initialize(size)
        @size = size
        @timeout = 0
        @workers = []

        @pool = WorkerPool.new WorkerCteator.new, ObjectPoolConfig.new(:pool_size => @size, :timeout => @timeout)
        
        @job_queue = Queue.new
        @mutex = Mutex.new
        @joined = false
        
        @thread = Thread.new do
            while true
                release_worker
                do_job
                sleep 0.001 if free?
            end
        end
    end

    def process(&job)
        @job_queue << job
    end
    
    def join
        sleep 0.1 while !free?
    end
    
    def free?
        res = nil
        @mutex.synchronize  { res = @workers.empty? }
        res && @job_queue.empty?
    end

    private
    def release_worker
        free_workers = []
        
        @mutex.synchronize do
            @workers.each { |w| free_workers << w  if w.free? }
            @workers -= free_workers
        end
        
        free_workers.each { |w| @pool.return_object w  }
    end

    def do_job
        begin
            worker = @pool.borrow_object
        rescue ObjectPoolFull
            return
        end
        
        begin
            job = @job_queue.pop true
        rescue
            @pool.return_object worker
            return
        end
        
        worker.job = job
        @mutex.synchronize  { @workers << worker }
    end
end

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#!/usr/local/bin/ruby
require 'ThreadPool'

thread_pool = ThreadPool.new 5

60.times do |i|
    thread_pool.process { sleep(rand*2); puts "    GG #{i}" }
end

10.times { sleep(rand*3); puts "Main Thread!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" }
thread_pool.join