/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file pipelineCyclerLinks.h
 * @author drose
 * @date 2006-02-16
 */

#ifndef PIPELINECYCLERLINKS_H
#define PIPELINECYCLERLINKS_H

#include "pandabase.h"
#include "selectThreadImpl.h"  // for THREADED_PIPELINE definition
#include "pnotify.h"

/**
 * This just stores the pointers to implement a doubly-linked list of
 * PipelineCyclers for a particular Pipeline object.  We use a hand-rolled
 * linked list rather than any STL container, because we want PipelineCyclers
 * to be able to add and remove themselves from this list very quickly.
 *
 * These pointers are inherited from this separate class so the Pipeline
 * object itself can be the root of the linked list.
 */
class EXPCL_PANDA_PIPELINE PipelineCyclerLinks {
protected:
#ifdef THREADED_PIPELINE
  INLINE PipelineCyclerLinks();
  INLINE ~PipelineCyclerLinks();

  INLINE void make_head();
  INLINE void clear_head();

  INLINE void remove_from_list();
  INLINE void insert_before(PipelineCyclerLinks *node);

  INLINE void take_list(PipelineCyclerLinks &other);

  PipelineCyclerLinks *_prev, *_next;
#endif
  friend class Pipeline;
};

#include "pipelineCyclerLinks.I"

#endif