github.rb

def commits(&block)
  mutex = Mutex.new
  queue = self.repositories(username)

  self.thread_count.times.map {
    Thread.new do
      while repo_name = mutex.synchronize { queue.pop }
        # get windows and then each sha
        repo_commits(repo_name, username, start_time, end_time) do |commit|
          mutex.synchronize { block.call commit }
        end
      end
    end
  }.each(&:join)
end