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schedule.c revision 1.6.26.1 
      1 /*	$NetBSD: schedule.c,v 1.6.26.1 2009/04/01 21:41:49 snj 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 1.6.26.1 2009/04/01 21:41:49 snj Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 #include <stdio.h>
     42 #include <math.h>
     43 #include <err.h>
     44 #include <limits.h>
     45 #include "trek.h"
     46 
     47 /*
     48 **  SCHEDULE AN EVENT
     49 **
     50 **	An event of type 'type' is scheduled for time NOW + 'offset'
     51 **	into the first available slot.  'x', 'y', and 'z' are
     52 **	considered the attributes for this event.
     53 **
     54 **	The address of the slot is returned.
     55 */
     56 
     57 struct event *schedule(type, offset, x, y, z)
     58 int	type;
     59 double	offset;
     60 char	x, y;
     61 char	z;
     62 {
     63 	struct event	*e;
     64 	int		i;
     65 	double			date;
     66 
     67 	date = Now.date + offset;
     68 	for (i = 0; i < MAXEVENTS; i++)
     69 	{
     70 		e = &Event[i];
     71 		if (e->evcode)
     72 			continue;
     73 		/* got a slot */
     74 #		ifdef xTRACE
     75 		if (Trace)
     76 			printf("schedule: type %d @ %.2f slot %d parm %d %d %d\n",
     77 				type, date, i, x, y, z);
     78 #		endif
     79 		e->evcode = type;
     80 		e->date = date;
     81 		e->x = x;
     82 		e->y = y;
     83 		e->systemname = z;
     84 		Now.eventptr[type & ~E_GHOST] = e;
     85 		return (e);
     86 	}
     87 	errx(1, "Cannot schedule event %d parm %d %d %d", type, x, y, z);
     88 }
     89 
     90 
     91 /*
     92 **  RESCHEDULE AN EVENT
     93 **
     94 **	The event pointed to by 'e' is rescheduled to the current
     95 **	time plus 'offset'.
     96 */
     97 
     98 void
     99 reschedule(e1, offset)
    100 struct event	*e1;
    101 double		offset;
    102 {
    103 	double			date;
    104 	struct event	*e;
    105 
    106 	e = e1;
    107 
    108 	date = Now.date + offset;
    109 	e->date = date;
    110 #	ifdef xTRACE
    111 	if (Trace)
    112 		printf("reschedule: type %d parm %d %d %d @ %.2f\n",
    113 			e->evcode, e->x, e->y, e->systemname, date);
    114 #	endif
    115 	return;
    116 }
    117 
    118 
    119 /*
    120 **  UNSCHEDULE AN EVENT
    121 **
    122 **	The event at slot 'e' is deleted.
    123 */
    124 
    125 void
    126 unschedule(e1)
    127 struct event	*e1;
    128 {
    129 	struct event	*e;
    130 
    131 	e = e1;
    132 
    133 #	ifdef xTRACE
    134 	if (Trace)
    135 		printf("unschedule: type %d @ %.2f parm %d %d %d\n",
    136 			e->evcode, e->date, e->x, e->y, e->systemname);
    137 #	endif
    138 	Now.eventptr[e->evcode & E_EVENT] = 0;
    139 	e->date = TOOLARGE;
    140 	e->evcode = 0;
    141 	return;
    142 }
    143 
    144 
    145 /*
    146 **  Abreviated schedule routine
    147 **
    148 **	Parameters are the event index and a factor for the time
    149 **	figure.
    150 */
    151 
    152 struct event *xsched(ev1, factor, x, y, z)
    153 int	ev1;
    154 int	factor;
    155 int	x, y, z;
    156 {
    157 	int	ev;
    158 
    159 	ev = ev1;
    160 	return (schedule(ev, -Param.eventdly[ev] * Param.time * log(franf()) / factor, x, y, z));
    161 }
    162 
    163 
    164 /*
    165 **  Simplified reschedule routine
    166 **
    167 **	Parameters are the event index, the initial date, and the
    168 **	division factor.  Look at the code to see what really happens.
    169 */
    170 
    171 void
    172 xresched(e1, ev1, factor)
    173 struct event	*e1;
    174 int		ev1;
    175 int		factor;
    176 {
    177 	int		ev;
    178 	struct event	*e;
    179 
    180 	ev = ev1;
    181 	e = e1;
    182 	reschedule(e, -Param.eventdly[ev] * Param.time * log(franf()) / factor);
    183 }
    184