trek/schedule.c

   1 /*
   2  * Copyright (c) 1980 Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 /*static char sccsid[] = "from: @(#)schedule.c  5.4 (Berkeley) 6/1/90";*/
  36 static char rcsid[] = "$Id: schedule.c,v 1.2 1993/08/01 18:50:03 mycroft Exp $";
  37 #endif /* not lint */
  38
  39 # include       "trek.h"
  40
  41 /*
  42 **  SCHEDULE AN EVENT
  43 **
  44 **      An event of type 'type' is scheduled for time NOW + 'offset'
  45 **      into the first available slot.  'x', 'y', and 'z' are
  46 **      considered the attributes for this event.
  47 **
  48 **      The address of the slot is returned.
  49 */
  50
  51 struct event *schedule(type, offset, x, y, z)
  52 int     type;
  53 double  offset;
  54 char    x, y;
  55 char    z;
  56 {
  57         register struct event   *e;
  58         register int            i;
  59         double                  date;
  60
  61         date = Now.date + offset;
  62         for (i = 0; i < MAXEVENTS; i++)
  63         {
  64                 e = &Event[i];
  65                 if (e->evcode)
  66                         continue;
  67                 /* got a slot */
  68 #               ifdef xTRACE
  69                 if (Trace)
  70                         printf("schedule: type %d @ %.2f slot %d parm %d %d %d\n",
  71                                 type, date, i, x, y, z);
  72 #               endif
  73                 e->evcode = type;
  74                 e->date = date;
  75                 e->x = x;
  76                 e->y = y;
  77                 e->systemname = z;
  78                 Now.eventptr[type] = e;
  79                 return (e);
  80         }
  81         syserr("Cannot schedule event %d parm %d %d %d", type, x, y, z);
  82 }
  83
  84
  85 /*
  86 **  RESCHEDULE AN EVENT
  87 **
  88 **      The event pointed to by 'e' is rescheduled to the current
  89 **      time plus 'offset'.
  90 */
  91
  92 reschedule(e1, offset)
  93 struct event    *e1;
  94 double          offset;
  95 {
  96         double                  date;
  97         register struct event   *e;
  98
  99         e = e1;
 100
 101         date = Now.date + offset;
 102         e->date = date;
 103 #       ifdef xTRACE
 104         if (Trace)
 105                 printf("reschedule: type %d parm %d %d %d @ %.2f\n",
 106                         e->evcode, e->x, e->y, e->systemname, date);
 107 #       endif
 108         return;
 109 }
 110
 111
 112 /*
 113 **  UNSCHEDULE AN EVENT
 114 **
 115 **      The event at slot 'e' is deleted.
 116 */
 117
 118 unschedule(e1)
 119 struct event    *e1;
 120 {
 121         register struct event   *e;
 122
 123         e = e1;
 124
 125 #       ifdef xTRACE
 126         if (Trace)
 127                 printf("unschedule: type %d @ %.2f parm %d %d %d\n",
 128                         e->evcode, e->date, e->x, e->y, e->systemname);
 129 #       endif
 130         Now.eventptr[e->evcode & E_EVENT] = 0;
 131         e->date = 1e50;
 132         e->evcode = 0;
 133         return;
 134 }
 135
 136
 137 /*
 138 **  Abreviated schedule routine
 139 **
 140 **      Parameters are the event index and a factor for the time
 141 **      figure.
 142 */
 143
 144 struct event *xsched(ev1, factor, x, y, z)
 145 int     ev1;
 146 int     factor;
 147 int     x, y, z;
 148 {
 149         register int    ev;
 150
 151         ev = ev1;
 152         return (schedule(ev, -Param.eventdly[ev] * Param.time * log(franf()) / factor, x, y, z));
 153 }
 154
 155
 156 /*
 157 **  Simplified reschedule routine
 158 **
 159 **      Parameters are the event index, the initial date, and the
 160 **      division factor.  Look at the code to see what really happens.
 161 */
 162
 163 xresched(e1, ev1, factor)
 164 struct event    *e1;
 165 int             ev1;
 166 int             factor;
 167 {
 168         register int            ev;
 169         register struct event   *e;
 170
 171         ev = ev1;
 172         e = e1;
 173         reschedule(e, -Param.eventdly[ev] * Param.time * log(franf()) / factor);
 174 }