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Annotation of 42BSD/games/trek/schedule.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)schedule.c 4.2     (Berkeley)      5/27/83";
        !             3: #endif not lint
        !             4: 
        !             5: # include      "trek.h"
        !             6: 
        !             7: /*
        !             8: **  SCHEDULE AN EVENT
        !             9: **
        !            10: **     An event of type 'type' is scheduled for time NOW + 'offset'
        !            11: **     into the first available slot.  'x', 'y', and 'z' are
        !            12: **     considered the attributes for this event.
        !            13: **
        !            14: **     The address of the slot is returned.
        !            15: */
        !            16: 
        !            17: struct event *schedule(type, offset, x, y, z)
        !            18: int    type;
        !            19: double offset;
        !            20: char   x, y;
        !            21: char   z;
        !            22: {
        !            23:        register struct event   *e;
        !            24:        register int            i;
        !            25:        double                  date;
        !            26: 
        !            27:        date = Now.date + offset;
        !            28:        for (i = 0; i < MAXEVENTS; i++)
        !            29:        {
        !            30:                e = &Event[i];
        !            31:                if (e->evcode)
        !            32:                        continue;
        !            33:                /* got a slot */
        !            34: #              ifdef xTRACE
        !            35:                if (Trace)
        !            36:                        printf("schedule: type %d @ %.2f slot %d parm %d %d %d\n",
        !            37:                                type, date, i, x, y, z);
        !            38: #              endif
        !            39:                e->evcode = type;
        !            40:                e->date = date;
        !            41:                e->x = x;
        !            42:                e->y = y;
        !            43:                e->systemname = z;
        !            44:                Now.eventptr[type] = e;
        !            45:                return (e);
        !            46:        }
        !            47:        syserr("Cannot schedule event %d parm %d %d %d", type, x, y, z);
        !            48: }
        !            49: 
        !            50: 
        !            51: /*
        !            52: **  RESCHEDULE AN EVENT
        !            53: **
        !            54: **     The event pointed to by 'e' is rescheduled to the current
        !            55: **     time plus 'offset'.
        !            56: */
        !            57: 
        !            58: reschedule(e1, offset)
        !            59: struct event   *e1;
        !            60: double         offset;
        !            61: {
        !            62:        double                  date;
        !            63:        register struct event   *e;
        !            64: 
        !            65:        e = e1;
        !            66: 
        !            67:        date = Now.date + offset;
        !            68:        e->date = date;
        !            69: #      ifdef xTRACE
        !            70:        if (Trace)
        !            71:                printf("reschedule: type %d parm %d %d %d @ %.2f\n",
        !            72:                        e->evcode, e->x, e->y, e->systemname, date);
        !            73: #      endif
        !            74:        return;
        !            75: }
        !            76: 
        !            77: 
        !            78: /*
        !            79: **  UNSCHEDULE AN EVENT
        !            80: **
        !            81: **     The event at slot 'e' is deleted.
        !            82: */
        !            83: 
        !            84: unschedule(e1)
        !            85: struct event   *e1;
        !            86: {
        !            87:        register struct event   *e;
        !            88: 
        !            89:        e = e1;
        !            90: 
        !            91: #      ifdef xTRACE
        !            92:        if (Trace)
        !            93:                printf("unschedule: type %d @ %.2f parm %d %d %d\n",
        !            94:                        e->evcode, e->date, e->x, e->y, e->systemname);
        !            95: #      endif
        !            96:        Now.eventptr[e->evcode & E_EVENT] = 0;
        !            97:        e->date = 1e50;
        !            98:        e->evcode = 0;
        !            99:        return;
        !           100: }
        !           101: 
        !           102: 
        !           103: /*
        !           104: **  Abreviated schedule routine
        !           105: **
        !           106: **     Parameters are the event index and a factor for the time
        !           107: **     figure.
        !           108: */
        !           109: 
        !           110: struct event *xsched(ev1, factor, x, y, z)
        !           111: int    ev1;
        !           112: int    factor;
        !           113: int    x, y, z;
        !           114: {
        !           115:        register int    ev;
        !           116: 
        !           117:        ev = ev1;
        !           118:        return (schedule(ev, -Param.eventdly[ev] * Param.time * log(franf()) / factor, x, y, z));
        !           119: }
        !           120: 
        !           121: 
        !           122: /*
        !           123: **  Simplified reschedule routine
        !           124: **
        !           125: **     Parameters are the event index, the initial date, and the
        !           126: **     division factor.  Look at the code to see what really happens.
        !           127: */
        !           128: 
        !           129: xresched(e1, ev1, factor)
        !           130: struct event   *e1;
        !           131: int            ev1;
        !           132: int            factor;
        !           133: {
        !           134:        register int            ev;
        !           135:        register struct event   *e;
        !           136: 
        !           137:        ev = ev1;
        !           138:        e = e1;
        !           139:        reschedule(e, -Param.eventdly[ev] * Param.time * log(franf()) / factor);
        !           140: }

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