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[] = "@(#)schedule.c  5.4 (Berkeley) 6/1/90";
  36 #endif /* not lint */
  37
  38 # include       "trek.h"
  39
  40 /*
  41 **  SCHEDULE AN EVENT
  42 **
  43 **      An event of type 'type' is scheduled for time NOW + 'offset'
  44 **      into the first available slot.  'x', 'y', and 'z' are
  45 **      considered the attributes for this event.
  46 **
  47 **      The address of the slot is returned.
  48 */
  49
  50 struct event *schedule(type, offset, x, y, z)
  51 int     type;
  52 double  offset;
  53 char    x, y;
  54 char    z;
  55 {
  56         register struct event   *e;
  57         register int            i;
  58         double                  date;
  59
  60         date = Now.date + offset;
  61         for (i = 0; i < MAXEVENTS; i++)
  62         {
  63                 e = &Event[i];
  64                 if (e->evcode)
  65                         continue;
  66                 /* got a slot */
  67 #               ifdef xTRACE
  68                 if (Trace)
  69                         printf("schedule: type %d @ %.2f slot %d parm %d %d %d\n",
  70                                 type, date, i, x, y, z);
  71 #               endif
  72                 e->evcode = type;
  73                 e->date = date;
  74                 e->x = x;
  75                 e->y = y;
  76                 e->systemname = z;
  77                 Now.eventptr[type] = e;
  78                 return (e);
  79         }
  80         syserr("Cannot schedule event %d parm %d %d %d", type, x, y, z);
  81 }
  82
  83
  84 /*
  85 **  RESCHEDULE AN EVENT
  86 **
  87 **      The event pointed to by 'e' is rescheduled to the current
  88 **      time plus 'offset'.
  89 */
  90
  91 reschedule(e1, offset)
  92 struct event    *e1;
  93 double          offset;
  94 {
  95         double                  date;
  96         register struct event   *e;
  97
  98         e = e1;
  99
 100         date = Now.date + offset;
 101         e->date = date;
 102 #       ifdef xTRACE
 103         if (Trace)
 104                 printf("reschedule: type %d parm %d %d %d @ %.2f\n",
 105                         e->evcode, e->x, e->y, e->systemname, date);
 106 #       endif
 107         return;
 108 }
 109
 110
 111 /*
 112 **  UNSCHEDULE AN EVENT
 113 **
 114 **      The event at slot 'e' is deleted.
 115 */
 116
 117 unschedule(e1)
 118 struct event    *e1;
 119 {
 120         register struct event   *e;
 121
 122         e = e1;
 123
 124 #       ifdef xTRACE
 125         if (Trace)
 126                 printf("unschedule: type %d @ %.2f parm %d %d %d\n",
 127                         e->evcode, e->date, e->x, e->y, e->systemname);
 128 #       endif
 129         Now.eventptr[e->evcode & E_EVENT] = 0;
 130         e->date = 1e50;
 131         e->evcode = 0;
 132         return;
 133 }
 134
 135
 136 /*
 137 **  Abreviated schedule routine
 138 **
 139 **      Parameters are the event index and a factor for the time
 140 **      figure.
 141 */
 142
 143 struct event *xsched(ev1, factor, x, y, z)
 144 int     ev1;
 145 int     factor;
 146 int     x, y, z;
 147 {
 148         register int    ev;
 149
 150         ev = ev1;
 151         return (schedule(ev, -Param.eventdly[ev] * Param.time * log(franf()) / factor, x, y, z));
 152 }
 153
 154
 155 /*
 156 **  Simplified reschedule routine
 157 **
 158 **      Parameters are the event index, the initial date, and the
 159 **      division factor.  Look at the code to see what really happens.
 160 */
 161
 162 xresched(e1, ev1, factor)
 163 struct event    *e1;
 164 int             ev1;
 165 int             factor;
 166 {
 167         register int            ev;
 168         register struct event   *e;
 169
 170         ev = ev1;
 171         e = e1;
 172         reschedule(e, -Param.eventdly[ev] * Param.time * log(franf()) / factor);
 173 }