libchill/queuelength.c

   1 /* Implement tasking-related runtime actions for CHILL.
   2    Copyright (C) 1992,1993 Free Software Foundation, Inc.
   3    Author: Wilfried Moser
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, 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
  52 int
  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 }