class Jekyll::Utils::ThreadEvent

def initialize 

def initialize
  @lock = Mutex.new
  @cond = ConditionVariable.new
  @flag = false
end

def set 

def set
  @lock.synchronize do
    yield if block_given?
    @flag = true
    @cond.broadcast
  end
end

def wait 

def wait
  @lock.synchronize do
    @cond.wait(@lock) unless @flag
  end
end