1 /* $NetBSD: schedule.c,v 1.6 2006/03/19 00:56:12 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. 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 1.6 2006/03/19 00:56:12 christos 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_GHOST] = 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 } 183