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schedule.c revision 1.6 
      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