C++ queue_type类代码示例

	void dump() {
		queue_type::stored_ptr entry;
		while ((entry = queue.pop()) != nullptr)
			write_entry(std::move(entry));
	}

 reset_queue_entry(barrier_queue_entry& e, queue_type& q)
   : e_(e), q_(q), last_(q.last())
 {}

 void swap(queue_type &q) {
   m_mutex.lock();
   q.swap(m_queue);
   m_mutex.unlock();
 }

 void fill(size_t num)
 {
     for (size_t i = 0; i < m_max_priority; ++i)
         for (size_t j = 0; j < num; ++j)
             m_queue.push(i, j);
 }

		std::size_t size(unsigned int timeout = 5) {
			boost::shared_lock<boost::shared_mutex> lock(mutex_, boost::get_system_time() + boost::posix_time::seconds(timeout));
			if (!lock || queue_.empty())
				return 0;
			return queue_.size();
		}

 void dequeue_( msg_type & msg)
 {
   msg = queue_.front();
   queue_.pop();
 }

 bool empty_() const
 { return queue_.empty(); }

	//! Returns the current number of nodes in the queue.
	size_type size() const { return m_queue.size(); }

 std::size_t size() const{
   return queue_.size();
 }

 bool dequeue(T& value) {
     return m_queue.pop(value);
 }

 //! Returns true if the queue is empty
 inline bool empty() { 
   m_mutex.lock();
   bool res = m_queue.empty();
   m_mutex.unlock();
   return res;
 }

  static inline void
  finish (bool output_fired,
	  bd_t bda,
	  bd_t bdb)
  {
    if (action_.automaton.get () != 0) {
      // We were executing an action of this automaton.

      switch (action_.action->type) {
      case INPUT:
	// We were executing an input.  Move to the next input.
	++input_action_pos_;
	proceed_to_input ();
	// -EEE
	input_action_list_.front ()->output_action.automaton->unlock_execution ();
	finish_output ();
	break;
      case OUTPUT:
	// We were executing an output ...
	if (output_fired) {
	  // ... and the output output did something.
	  output_buffer_a_ = action_.automaton->lookup_buffer (bda);
	  // Synchronize the buffers.
	  if (output_buffer_a_.get () != 0) {
	    output_buffer_a_->sync (0, output_buffer_a_->size ());
	  }
	  output_buffer_b_ = action_.automaton->lookup_buffer (bdb);
	  if (output_buffer_b_.get () != 0) {
	    output_buffer_b_->sync (0, output_buffer_b_->size ());
	  }
	  // Proceed to execute the inputs.
	  input_action_pos_ = input_action_list_.begin ();
	  // This does not return if there are inputs.
	  proceed_to_input ();
	}
	// No input actions to execute.
	// -EEE
	action_.automaton->unlock_execution ();
	finish_output ();
	break;
      case INTERNAL:
      case SYSTEM:
	// -EEE
	action_.automaton->unlock_execution ();
	break;
      }
    }

    // We are done with the current action.
    action_.automaton = shared_ptr<automaton> ();

    for (;;) {

      irq_handler::process_interrupts ();

      while (!ready_queue_.empty ()) {
	// Get the automaton context and remove it from the ready queue.
	automaton_context* c = ready_queue_.front ();
	ready_queue_.pop_front ();

	// Load the action.
	action_ = c->front ();
	c->pop_front ();

	// The automaton exists.  Continue loading and execute.
	switch (action_.action->type) {
	case INPUT:
	  // Error.  Not a local action.
	  kpanic ("Non-local action on execution queue");
	  break;
	case OUTPUT:
	  {
	    kassert (input_action_list_.empty ());
	    // Copy the bindings.
	    action_.automaton->copy_bound_inputs (action_, back_inserter (input_action_list_));
	    
	    // Sort the bindings by input automaton.
	    sort (input_action_list_.begin (), input_action_list_.end (), sort_bindings_by_input ());
	    
	    // We lock the automata in order.  This is called Havender's Principle.
	    bool output_locked = false;
	    for (input_action_list_type::const_iterator pos = input_action_list_.begin ();
		 pos != input_action_list_.end ();
		 ++pos) {
	      shared_ptr<automaton> input_automaton = (*pos)->input_action.automaton;
	      if (!output_locked && action_.automaton->aid () < input_automaton->aid ()) {
		// +EEE
		action_.automaton->lock_execution ();
		output_locked = true;
	      }
	      // +FFF
	      input_automaton->lock_execution ();
	    }
	    if (!output_locked) {
	      // +EEE
	      action_.automaton->lock_execution ();
	      output_locked = true;
	    }
	    
	    input_action_pos_ = input_action_list_.begin ();
//.........这里部分代码省略.........

    void reset() {
        cancel();

        T value;
        while (m_queue.pop(value));
    }

 void clear()
 {
     m_queue.clear();
 }

 bool empty_unsafe() {
   return m_queue.empty();
 }