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Annotation of Gnu-Mach/i386/i386at/kd_queue.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
        !             4:  * All Rights Reserved.
        !             5:  * 
        !             6:  * Permission to use, copy, modify and distribute this software and its
        !             7:  * documentation is hereby granted, provided that both the copyright
        !             8:  * notice and this permission notice appear in all copies of the
        !             9:  * software, derivative works or modified versions, and any portions
        !            10:  * thereof, and that both notices appear in supporting documentation.
        !            11:  * 
        !            12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            15:  * 
        !            16:  * Carnegie Mellon requests users of this software to return to
        !            17:  * 
        !            18:  *  Software Distribution Coordinator  or  [email protected]
        !            19:  *  School of Computer Science
        !            20:  *  Carnegie Mellon University
        !            21:  *  Pittsburgh PA 15213-3890
        !            22:  * 
        !            23:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            24:  * the rights to redistribute these changes.
        !            25:  */
        !            26: /* **********************************************************************
        !            27:  File:         kd_queue.c
        !            28:  Description:  Event queue code for keyboard/display (and mouse) driver.
        !            29: 
        !            30:  $ Header: $
        !            31: 
        !            32:  Copyright Ing. C. Olivetti & C. S.p.A. 1989.
        !            33:  All rights reserved.
        !            34: ********************************************************************** */
        !            35: /*
        !            36:   Copyright 1988, 1989 by Olivetti Advanced Technology Center, Inc.,
        !            37: Cupertino, California.
        !            38: 
        !            39:                All Rights Reserved
        !            40: 
        !            41:   Permission to use, copy, modify, and distribute this software and
        !            42: its documentation for any purpose and without fee is hereby
        !            43: granted, provided that the above copyright notice appears in all
        !            44: copies and that both the copyright notice and this permission notice
        !            45: appear in supporting documentation, and that the name of Olivetti
        !            46: not be used in advertising or publicity pertaining to distribution
        !            47: of the software without specific, written prior permission.
        !            48: 
        !            49:   OLIVETTI DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
        !            50: INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
        !            51: IN NO EVENT SHALL OLIVETTI BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
        !            52: CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
        !            53: LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
        !            54: NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUR OF OR IN CONNECTION
        !            55: WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            56: */
        !            57: 
        !            58: 
        !            59: #include <i386at/kd_queue.h>
        !            60: 
        !            61: /*
        !            62:  * Notice that when adding an entry to the queue, the caller provides 
        !            63:  * its own storage, which is copied into the queue.  However, when 
        !            64:  * removing an entry from the queue, the caller is given a pointer to a 
        !            65:  * queue element.  This means that the caller must either process the 
        !            66:  * element or copy it into its own storage before unlocking the queue.
        !            67:  *
        !            68:  * These routines should be called only at a protected SPL.
        !            69:  */
        !            70: 
        !            71: #define q_next(index)  (((index)+1) % KDQSIZE)
        !            72: 
        !            73: boolean_t
        !            74: kdq_empty(q)
        !            75:        kd_event_queue *q;
        !            76: {
        !            77:        return(q->firstfree == q->firstout);
        !            78: }
        !            79: 
        !            80: boolean_t
        !            81: kdq_full(q)
        !            82:        kd_event_queue *q;
        !            83: {
        !            84:        return(q_next(q->firstfree) == q->firstout);
        !            85: }
        !            86: 
        !            87: void
        !            88: kdq_put(q, ev)
        !            89:        kd_event_queue *q;
        !            90:        kd_event *ev;
        !            91: {
        !            92:        kd_event *qp = q->events + q->firstfree;
        !            93: 
        !            94:        qp->type = ev->type;
        !            95:        qp->time = ev->time;
        !            96:        qp->value = ev->value;
        !            97:        q->firstfree = q_next(q->firstfree);
        !            98: }
        !            99: 
        !           100: kd_event *
        !           101: kdq_get(q)
        !           102:        kd_event_queue *q;
        !           103: {
        !           104:        kd_event *result = q->events + q->firstout;
        !           105: 
        !           106:        q->firstout = q_next(q->firstout);
        !           107:        return(result);
        !           108: }
        !           109: 
        !           110: void
        !           111: kdq_reset(q)
        !           112:        kd_event_queue *q;
        !           113: {
        !           114:        q->firstout = q->firstfree = 0;
        !           115: }

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