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 * 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 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 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 * 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 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