1 /* @(#)schedule.c 8.1 (Berkeley) 5/31/93 */
2 /* $NetBSD: schedule.c,v 1.11 2009/05/24 22:55:03 dholland Exp $ */
3
4 /*
5 * Copyright (c) 1980, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <stdio.h>
34 #include <math.h>
35 #include <err.h>
36 #include <limits.h>
37 #include "trek.h"
38
39 /*
40 ** SCHEDULE AN EVENT
41 **
42 ** An event of type 'type' is scheduled for time NOW + 'offset'
43 ** into the first available slot. 'x', 'y', and 'z' are
44 ** considered the attributes for this event.
45 **
46 ** The address of the slot is returned.
47 */
48
49 struct event *
schedule(int type,double offset,int x,int y,int z)50 schedule(int type, double offset, int x, int y, int z)
51 {
52 struct event *e;
53 int i;
54 double date;
55
56 date = Now.date + offset;
57 for (i = 0; i < MAXEVENTS; i++) {
58 e = &Event[i];
59 if (e->evcode)
60 continue;
61 /* got a slot */
62 #ifdef xTRACE
63 if (Trace)
64 printf("schedule: type %d @ %.2f "
65 "slot %d parm %d %d %d\n",
66 type, date, i, x, y, z);
67 #endif
68 e->evcode = type;
69 e->date = date;
70 e->x = x;
71 e->y = y;
72 e->systemname = z;
73 Now.eventptr[type & ~E_GHOST] = e;
74 return (e);
75 }
76 errx(1, "Cannot schedule event %d parm %d %d %d", type, x, y, z);
77 }
78
79
80 /*
81 ** RESCHEDULE AN EVENT
82 **
83 ** The event pointed to by 'e' is rescheduled to the current
84 ** time plus 'offset'.
85 */
86
87 void
reschedule(struct event * e1,double offset)88 reschedule(struct event *e1, double offset)
89 {
90 double date;
91 struct event *e;
92
93 e = e1;
94
95 date = Now.date + offset;
96 e->date = date;
97 #ifdef xTRACE
98 if (Trace)
99 printf("reschedule: type %d parm %d %d %d @ %.2f\n",
100 e->evcode, e->x, e->y, e->systemname, date);
101 #endif
102 return;
103 }
104
105
106 /*
107 ** UNSCHEDULE AN EVENT
108 **
109 ** The event at slot 'e' is deleted.
110 */
111
112 void
unschedule(struct event * e1)113 unschedule(struct event *e1)
114 {
115 struct event *e;
116
117 e = e1;
118
119 #ifdef xTRACE
120 if (Trace)
121 printf("unschedule: type %d @ %.2f parm %d %d %d\n",
122 e->evcode, e->date, e->x, e->y, e->systemname);
123 #endif
124 Now.eventptr[e->evcode & E_EVENT] = 0;
125 e->date = TOOLARGE;
126 e->evcode = 0;
127 return;
128 }
129
130
131 /*
132 ** Abreviated schedule routine
133 **
134 ** Parameters are the event index and a factor for the time
135 ** figure.
136 */
137
138 struct event *
xsched(int ev1,int factor,int x,int y,int z)139 xsched(int ev1, int factor, int x, int y, int z)
140 {
141 int ev;
142 double when;
143
144 ev = ev1;
145 when = -Param.eventdly[ev] * Param.time * log(franf()) / factor;
146 return (schedule(ev, when, x, y, z));
147 }
148
149
150 /*
151 ** Simplified reschedule routine
152 **
153 ** Parameters are the event index, the initial date, and the
154 ** division factor. Look at the code to see what really happens.
155 */
156
157 void
xresched(struct event * e1,int ev1,int factor)158 xresched(struct event *e1, int ev1, int factor)
159 {
160 int ev;
161 struct event *e;
162 double when;
163
164 ev = ev1;
165 e = e1;
166 when = -Param.eventdly[ev] * Param.time * log(franf()) / factor;
167 reschedule(e, when);
168 }
169