/* Implement tasking-related runtime actions for CHILL.
   Copyright (C) 1992,1993 Free Software Foundation, Inc.
   Author: Wilfried Moser

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "rtltypes.h"
#include "rts.h"

/*
 * function __queue_length
 *
 * parameters:
 *     buf_ev      Buffer or event location
 *     is_event    0 .. buf_ev is a buffer location
 *                 1 .. buf_ev is an event location
 *
 * returns:
 *     int         number of delayed processeson an event location
 *                 or number of send delayed processes on a buffer
 *
 * exceptions:
 *     none
 *
 * abstract:
 *     implements the QUEUE_LENGTH built-in.
 *
 */

int
__queue_length (buf_ev, is_event)
     void  *buf_ev;
     int    is_event;
{
  int            retval = 0;
  
  /* if buf_ev == 0 then we don't have anything */
  if (buf_ev == 0)
    return 0;

  if (is_event)
    {
      /* process an event queue */
      Event_Queue   *ev = buf_ev;

      while (ev)
	{
	  retval++;
	  ev = ev->forward;
	}
    }
  else
    {
      /* process a buffer queue */
      Buffer_Queue *bq = buf_ev;
      Buffer_Send_Queue *bsq = bq->sendqueue;

      while (bsq)
	{
	  retval++;
	  bsq = bsq->forward;
	}
    }
  return retval;
}