1 /* $NetBSD: schedule.c,v 1.4 1997/10/12 21:25:11 christos 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)schedule.c 8.1 (Berkeley) 5/31/93"; 40 #else 41 __RCSID("$NetBSD: schedule.c,v 1.4 1997/10/12 21:25:11 christos Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <stdio.h> 46 #include <math.h> 47 #include <err.h> 48 #include "trek.h" 49 50 /* 51 ** SCHEDULE AN EVENT 52 ** 53 ** An event of type 'type' is scheduled for time NOW + 'offset' 54 ** into the first available slot. 'x', 'y', and 'z' are 55 ** considered the attributes for this event. 56 ** 57 ** The address of the slot is returned. 58 */ 59 60 struct event *schedule(type, offset, x, y, z) 61 int type; 62 double offset; 63 char x, y; 64 char z; 65 { 66 struct event *e; 67 int i; 68 double date; 69 70 date = Now.date + offset; 71 for (i = 0; i < MAXEVENTS; i++) 72 { 73 e = &Event[i]; 74 if (e->evcode) 75 continue; 76 /* got a slot */ 77 # ifdef xTRACE 78 if (Trace) 79 printf("schedule: type %d @ %.2f slot %d parm %d %d %d\n", 80 type, date, i, x, y, z); 81 # endif 82 e->evcode = type; 83 e->date = date; 84 e->x = x; 85 e->y = y; 86 e->systemname = z; 87 Now.eventptr[type] = e; 88 return (e); 89 } 90 errx(1, "Cannot schedule event %d parm %d %d %d", type, x, y, z); 91 } 92 93 94 /* 95 ** RESCHEDULE AN EVENT 96 ** 97 ** The event pointed to by 'e' is rescheduled to the current 98 ** time plus 'offset'. 99 */ 100 101 void 102 reschedule(e1, offset) 103 struct event *e1; 104 double offset; 105 { 106 double date; 107 struct event *e; 108 109 e = e1; 110 111 date = Now.date + offset; 112 e->date = date; 113 # ifdef xTRACE 114 if (Trace) 115 printf("reschedule: type %d parm %d %d %d @ %.2f\n", 116 e->evcode, e->x, e->y, e->systemname, date); 117 # endif 118 return; 119 } 120 121 122 /* 123 ** UNSCHEDULE AN EVENT 124 ** 125 ** The event at slot 'e' is deleted. 126 */ 127 128 void 129 unschedule(e1) 130 struct event *e1; 131 { 132 struct event *e; 133 134 e = e1; 135 136 # ifdef xTRACE 137 if (Trace) 138 printf("unschedule: type %d @ %.2f parm %d %d %d\n", 139 e->evcode, e->date, e->x, e->y, e->systemname); 140 # endif 141 Now.eventptr[e->evcode & E_EVENT] = 0; 142 e->date = 1e50; 143 e->evcode = 0; 144 return; 145 } 146 147 148 /* 149 ** Abreviated schedule routine 150 ** 151 ** Parameters are the event index and a factor for the time 152 ** figure. 153 */ 154 155 struct event *xsched(ev1, factor, x, y, z) 156 int ev1; 157 int factor; 158 int x, y, z; 159 { 160 int ev; 161 162 ev = ev1; 163 return (schedule(ev, -Param.eventdly[ev] * Param.time * log(franf()) / factor, x, y, z)); 164 } 165 166 167 /* 168 ** Simplified reschedule routine 169 ** 170 ** Parameters are the event index, the initial date, and the 171 ** division factor. Look at the code to see what really happens. 172 */ 173 174 void 175 xresched(e1, ev1, factor) 176 struct event *e1; 177 int ev1; 178 int factor; 179 { 180 int ev; 181 struct event *e; 182 183 ev = ev1; 184 e = e1; 185 reschedule(e, -Param.eventdly[ev] * Param.time * log(franf()) / factor); 186 } 187