1 /* $NetBSD: schedule.c,v 1.12 2022/05/22 11:27:33 andvar 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 1.12 2022/05/22 11:27:33 andvar Exp $");
38 #endif
39 #endif /* not lint */
40
41 #include <stdio.h>
42 #include <math.h>
43 #include <err.h>
44 #include <limits.h>
45 #include "trek.h"
46
47 /*
48 ** SCHEDULE AN EVENT
49 **
50 ** An event of type 'type' is scheduled for time NOW + 'offset'
51 ** into the first available slot. 'x', 'y', and 'z' are
52 ** considered the attributes for this event.
53 **
54 ** The address of the slot is returned.
55 */
56
57 struct event *
schedule(int type,double offset,int x,int y,int z)58 schedule(int type, double offset, int x, int y, int z)
59 {
60 struct event *e;
61 int i;
62 double date;
63
64 date = Now.date + offset;
65 for (i = 0; i < MAXEVENTS; i++) {
66 e = &Event[i];
67 if (e->evcode)
68 continue;
69 /* got a slot */
70 #ifdef xTRACE
71 if (Trace)
72 printf("schedule: type %d @ %.2f "
73 "slot %d parm %d %d %d\n",
74 type, date, i, x, y, z);
75 #endif
76 e->evcode = type;
77 e->date = date;
78 e->x = x;
79 e->y = y;
80 e->systemname = z;
81 Now.eventptr[type & ~E_GHOST] = e;
82 return (e);
83 }
84 errx(1, "Cannot schedule event %d parm %d %d %d", type, x, y, z);
85 }
86
87
88 /*
89 ** RESCHEDULE AN EVENT
90 **
91 ** The event pointed to by 'e' is rescheduled to the current
92 ** time plus 'offset'.
93 */
94
95 void
reschedule(struct event * e1,double offset)96 reschedule(struct event *e1, double offset)
97 {
98 double date;
99 struct event *e;
100
101 e = e1;
102
103 date = Now.date + offset;
104 e->date = date;
105 #ifdef xTRACE
106 if (Trace)
107 printf("reschedule: type %d parm %d %d %d @ %.2f\n",
108 e->evcode, e->x, e->y, e->systemname, date);
109 #endif
110 return;
111 }
112
113
114 /*
115 ** UNSCHEDULE AN EVENT
116 **
117 ** The event at slot 'e' is deleted.
118 */
119
120 void
unschedule(struct event * e1)121 unschedule(struct event *e1)
122 {
123 struct event *e;
124
125 e = e1;
126
127 #ifdef xTRACE
128 if (Trace)
129 printf("unschedule: type %d @ %.2f parm %d %d %d\n",
130 e->evcode, e->date, e->x, e->y, e->systemname);
131 #endif
132 Now.eventptr[e->evcode & E_EVENT] = 0;
133 e->date = TOOLARGE;
134 e->evcode = 0;
135 return;
136 }
137
138
139 /*
140 ** Abbreviated schedule routine
141 **
142 ** Parameters are the event index and a factor for the time
143 ** figure.
144 */
145
146 struct event *
xsched(int ev1,int factor,int x,int y,int z)147 xsched(int ev1, int factor, int x, int y, int z)
148 {
149 int ev;
150 double when;
151
152 ev = ev1;
153 when = -Param.eventdly[ev] * Param.time * log(franf()) / factor;
154 return (schedule(ev, when, x, y, z));
155 }
156
157
158 /*
159 ** Simplified reschedule routine
160 **
161 ** Parameters are the event index, the initial date, and the
162 ** division factor. Look at the code to see what really happens.
163 */
164
165 void
xresched(struct event * e1,int ev1,int factor)166 xresched(struct event *e1, int ev1, int factor)
167 {
168 int ev;
169 struct event *e;
170 double when;
171
172 ev = ev1;
173 e = e1;
174 when = -Param.eventdly[ev] * Param.time * log(franf()) / factor;
175 reschedule(e, when);
176 }
177