Class: Rbgo::Channel::NonBufferChan

Inherits:
Object
  • Object
show all
Includes:
Chan
Defined in:
lib/rbgo/select_chan.rb

Overview

NonBufferChan

Instance Method Summary collapse

Methods included from Chan

new

Constructor Details

#initialize ⇒ NonBufferChan

Returns a new instance of NonBufferChan.



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# File 'lib/rbgo/select_chan.rb', line 88

def initialize
  self.enq_mutex             = Mutex.new
  self.deq_mutex             = Mutex.new
  self.enq_cond              = ConditionVariable.new
  self.deq_cond              = ConditionVariable.new
  self.resource_array        = []
  self.close_flag            = false
  self.have_enq_waiting_flag = false
  self.have_deq_waiting_flag = false

  @readable_observers = Set.new
  @readable_observers.extend(MonitorMixin)
  @writable_observers = Set.new
  @writable_observers.extend(MonitorMixin)
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/rbgo/select_chan.rb', line 191

def close
  self.close_flag = true
  enq_cond.broadcast
  deq_cond.broadcast
  notify_readable_observers
  notify_writable_observers
  self
end

#closed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rbgo/select_chan.rb', line 200

def closed?
  close_flag
end

#pop(nonblock = false) ⇒ Object Also known as: deq, shift 



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# File 'lib/rbgo/select_chan.rb', line 158

def pop(nonblock = false)
  resource = nil
  if closed?
    return [nil, false]
  end

  if nonblock
    raise ThreadError.new unless deq_mutex.try_lock
  else
    deq_mutex.lock
  end

  begin
    if nonblock
      raise ThreadError.new unless have_enq_waiting_flag
    end

    while resource_array.empty? && !closed?
      self.have_deq_waiting_flag = true
      notify_writable_observers
      enq_cond.wait(deq_mutex)
    end
    resource = resource_array.first
    resource_array.clear
    self.have_deq_waiting_flag = false
    deq_cond.signal
  ensure
    deq_mutex.unlock
  end

  [resource, !closed?]
end

#push(obj, nonblock = false) ⇒ Object Also known as: <<, enq 



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# File 'lib/rbgo/select_chan.rb', line 104

def push(obj, nonblock = false)
  if closed?
    raise ClosedQueueError.new
  end

  if nonblock
    raise ThreadError.new unless enq_mutex.try_lock
  else
    enq_mutex.lock
  end

  begin
    if nonblock
      raise ThreadError.new unless have_deq_waiting_flag
    end

    begin
      if closed?
        raise ClosedQueueError.new
      else
        deq_mutex.synchronize do
          resource_array[0] = obj
          enq_cond.signal
          until resource_array.empty? || closed?
            self.have_enq_waiting_flag = true

            begin
              Thread.new do
                deq_mutex.synchronize do
                  # no op
                end
                notify_readable_observers
              end
            rescue Exception => ex
              STDERR.puts ex
              sleep 1
              retry
            end

            deq_cond.wait(deq_mutex)
          end
          raise ClosedQueueError.new if closed?
        end
      end
    ensure
      self.have_enq_waiting_flag = false
    end
  ensure
    enq_mutex.unlock
  end

  self
end