trek/schedule.c

   1 /*      $NetBSD: schedule.c,v 1.5 2003/08/07 09:37:53 agc Exp $ */
   2
   3 /*
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)schedule.c  8.1 (Berkeley) 5/31/93";
  36 #else
  37 __RCSID("$NetBSD: schedule.c,v 1.5 2003/08/07 09:37:53 agc Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <stdio.h>
  42 #include <math.h>
  43 #include <err.h>
  44 #include "trek.h"
  45
  46 /*
  47 **  SCHEDULE AN EVENT
  48 **
  49 **      An event of type 'type' is scheduled for time NOW + 'offset'
  50 **      into the first available slot.  'x', 'y', and 'z' are
  51 **      considered the attributes for this event.
  52 **
  53 **      The address of the slot is returned.
  54 */
  55
  56 struct event *schedule(type, offset, x, y, z)
  57 int     type;
  58 double  offset;
  59 char    x, y;
  60 char    z;
  61 {
  62         struct event    *e;
  63         int             i;
  64         double                  date;
  65
  66         date = Now.date + offset;
  67         for (i = 0; i < MAXEVENTS; i++)
  68         {
  69                 e = &Event[i];
  70                 if (e->evcode)
  71                         continue;
  72                 /* got a slot */
  73 #               ifdef xTRACE
  74                 if (Trace)
  75                         printf("schedule: type %d @ %.2f slot %d parm %d %d %d\n",
  76                                 type, date, i, x, y, z);
  77 #               endif
  78                 e->evcode = type;
  79                 e->date = date;
  80                 e->x = x;
  81                 e->y = y;
  82                 e->systemname = z;
  83                 Now.eventptr[type] = e;
  84                 return (e);
  85         }
  86         errx(1, "Cannot schedule event %d parm %d %d %d", type, x, y, z);
  87 }
  88
  89
  90 /*
  91 **  RESCHEDULE AN EVENT
  92 **
  93 **      The event pointed to by 'e' is rescheduled to the current
  94 **      time plus 'offset'.
  95 */
  96
  97 void
  98 reschedule(e1, offset)
  99 struct event    *e1;
 100 double          offset;
 101 {
 102         double                  date;
 103         struct event    *e;
 104
 105         e = e1;
 106
 107         date = Now.date + offset;
 108         e->date = date;
 109 #       ifdef xTRACE
 110         if (Trace)
 111                 printf("reschedule: type %d parm %d %d %d @ %.2f\n",
 112                         e->evcode, e->x, e->y, e->systemname, date);
 113 #       endif
 114         return;
 115 }
 116
 117
 118 /*
 119 **  UNSCHEDULE AN EVENT
 120 **
 121 **      The event at slot 'e' is deleted.
 122 */
 123
 124 void
 125 unschedule(e1)
 126 struct event    *e1;
 127 {
 128         struct event    *e;
 129
 130         e = e1;
 131
 132 #       ifdef xTRACE
 133         if (Trace)
 134                 printf("unschedule: type %d @ %.2f parm %d %d %d\n",
 135                         e->evcode, e->date, e->x, e->y, e->systemname);
 136 #       endif
 137         Now.eventptr[e->evcode & E_EVENT] = 0;
 138         e->date = 1e50;
 139         e->evcode = 0;
 140         return;
 141 }
 142
 143
 144 /*
 145 **  Abreviated schedule routine
 146 **
 147 **      Parameters are the event index and a factor for the time
 148 **      figure.
 149 */
 150
 151 struct event *xsched(ev1, factor, x, y, z)
 152 int     ev1;
 153 int     factor;
 154 int     x, y, z;
 155 {
 156         int     ev;
 157
 158         ev = ev1;
 159         return (schedule(ev, -Param.eventdly[ev] * Param.time * log(franf()) / factor, x, y, z));
 160 }
 161
 162
 163 /*
 164 **  Simplified reschedule routine
 165 **
 166 **      Parameters are the event index, the initial date, and the
 167 **      division factor.  Look at the code to see what really happens.
 168 */
 169
 170 void
 171 xresched(e1, ev1, factor)
 172 struct event    *e1;
 173 int             ev1;
 174 int             factor;
 175 {
 176         int             ev;
 177         struct event    *e;
 178
 179         ev = ev1;
 180         e = e1;
 181         reschedule(e, -Param.eventdly[ev] * Param.time * log(franf()) / factor);
 182 }