1 /* $NetBSD: schedule.c,v 1.3 1995/04/22 10:59:23 cgd 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 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)schedule.c 8.1 (Berkeley) 5/31/93"; 39 #else 40 static char rcsid[] = "$NetBSD: schedule.c,v 1.3 1995/04/22 10:59:23 cgd Exp $"; 41 #endif 42 #endif /* not lint */ 43 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 register struct event *e; 63 register 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; 84 return (e); 85 } 86 syserr("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 reschedule(e1, offset) 98 struct event *e1; 99 double offset; 100 { 101 double date; 102 register struct event *e; 103 104 e = e1; 105 106 date = Now.date + offset; 107 e->date = date; 108 # ifdef xTRACE 109 if (Trace) 110 printf("reschedule: type %d parm %d %d %d @ %.2f\n", 111 e->evcode, e->x, e->y, e->systemname, date); 112 # endif 113 return; 114 } 115 116 117 /* 118 ** UNSCHEDULE AN EVENT 119 ** 120 ** The event at slot 'e' is deleted. 121 */ 122 123 unschedule(e1) 124 struct event *e1; 125 { 126 register struct event *e; 127 128 e = e1; 129 130 # ifdef xTRACE 131 if (Trace) 132 printf("unschedule: type %d @ %.2f parm %d %d %d\n", 133 e->evcode, e->date, e->x, e->y, e->systemname); 134 # endif 135 Now.eventptr[e->evcode & E_EVENT] = 0; 136 e->date = 1e50; 137 e->evcode = 0; 138 return; 139 } 140 141 142 /* 143 ** Abreviated schedule routine 144 ** 145 ** Parameters are the event index and a factor for the time 146 ** figure. 147 */ 148 149 struct event *xsched(ev1, factor, x, y, z) 150 int ev1; 151 int factor; 152 int x, y, z; 153 { 154 register int ev; 155 156 ev = ev1; 157 return (schedule(ev, -Param.eventdly[ev] * Param.time * log(franf()) / factor, x, y, z)); 158 } 159 160 161 /* 162 ** Simplified reschedule routine 163 ** 164 ** Parameters are the event index, the initial date, and the 165 ** division factor. Look at the code to see what really happens. 166 */ 167 168 xresched(e1, ev1, factor) 169 struct event *e1; 170 int ev1; 171 int factor; 172 { 173 register int ev; 174 register struct event *e; 175 176 ev = ev1; 177 e = e1; 178 reschedule(e, -Param.eventdly[ev] * Param.time * log(franf()) / factor); 179 } 180