1/* Implement tasking-related runtime actions for CHILL.
2   Copyright (C) 1992,1993 Free Software Foundation, Inc.
3   Author: Wilfried Moser
4
5This file is part of GNU CC.
6
7GNU CC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU CC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GNU CC; see the file COPYING.  If not, write to
19the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA.  */
21
22/* As a special exception, if you link this library with other files,
23   some of which are compiled with GCC, to produce an executable,
24   this library does not by itself cause the resulting executable
25   to be covered by the GNU General Public License.
26   This exception does not however invalidate any other reasons why
27   the executable file might be covered by the GNU General Public License.  */
28
29#include "rtltypes.h"
30#include "rts.h"
31
32/*
33 * function __queue_length
34 *
35 * parameters:
36 *     buf_ev      Buffer or event location
37 *     is_event    0 .. buf_ev is a buffer location
38 *                 1 .. buf_ev is an event location
39 *
40 * returns:
41 *     int         number of delayed processeson an event location
42 *                 or number of send delayed processes on a buffer
43 *
44 * exceptions:
45 *     none
46 *
47 * abstract:
48 *     implements the QUEUE_LENGTH built-in.
49 *
50 */
51
52int
53__queue_length (buf_ev, is_event)
54     void  *buf_ev;
55     int    is_event;
56{
57  int            retval = 0;
58
59  /* if buf_ev == 0 then we don't have anything */
60  if (buf_ev == 0)
61    return 0;
62
63  if (is_event)
64    {
65      /* process an event queue */
66      Event_Queue   *ev = buf_ev;
67
68      while (ev)
69	{
70	  retval++;
71	  ev = ev->forward;
72	}
73    }
74  else
75    {
76      /* process a buffer queue */
77      Buffer_Queue *bq = buf_ev;
78      Buffer_Send_Queue *bsq = bq->sendqueue;
79
80      while (bsq)
81	{
82	  retval++;
83	  bsq = bsq->forward;
84	}
85    }
86  return retval;
87}
88