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schedule.c revision 1.3 
      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