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Annotation of kernel/ipc/ipc_thread.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  * Copyright (c) 1995, 1994, 1993, 1992, 1991, 1990  
        !            27:  * Open Software Foundation, Inc. 
        !            28:  *  
        !            29:  * Permission to use, copy, modify, and distribute this software and 
        !            30:  * its documentation for any purpose and without fee is hereby granted, 
        !            31:  * provided that the above copyright notice appears in all copies and 
        !            32:  * that both the copyright notice and this permission notice appear in 
        !            33:  * supporting documentation, and that the name of ("OSF") or Open Software 
        !            34:  * Foundation not be used in advertising or publicity pertaining to 
        !            35:  * distribution of the software without specific, written prior permission. 
        !            36:  *  
        !            37:  * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 
        !            38:  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
        !            39:  * FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL OSF BE LIABLE FOR ANY 
        !            40:  * SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 
        !            41:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 
        !            42:  * ACTION OF CONTRACT, NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING 
        !            43:  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE 
        !            44:  */
        !            45: /*
        !            46:  * OSF Research Institute MK6.1 (unencumbered) 1/31/1995
        !            47:  */
        !            48: /* 
        !            49:  * Mach Operating System
        !            50:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
        !            51:  * All Rights Reserved.
        !            52:  * 
        !            53:  * Permission to use, copy, modify and distribute this software and its
        !            54:  * documentation is hereby granted, provided that both the copyright
        !            55:  * notice and this permission notice appear in all copies of the
        !            56:  * software, derivative works or modified versions, and any portions
        !            57:  * thereof, and that both notices appear in supporting documentation.
        !            58:  * 
        !            59:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            60:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            61:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            62:  * 
        !            63:  * Carnegie Mellon requests users of this software to return to
        !            64:  * 
        !            65:  *  Software Distribution Coordinator  or  [email protected]
        !            66:  *  School of Computer Science
        !            67:  *  Carnegie Mellon University
        !            68:  *  Pittsburgh PA 15213-3890
        !            69:  * 
        !            70:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            71:  * the rights to redistribute these changes.
        !            72:  */
        !            73: /*
        !            74:  *     File:   ipc/ipc_thread.c
        !            75:  *     Author: Rich Draves
        !            76:  *     Date:   1989
        !            77:  *
        !            78:  *     IPC operations on threads.
        !            79:  */
        !            80: 
        !            81: #include <ipc/ipc_thread.h>
        !            82: 
        !            83: /*
        !            84:  *     Routine:        ipc_thread_enqueue
        !            85:  *     Purpose:
        !            86:  *             Enqueue a thread.
        !            87:  */
        !            88: 
        !            89: void
        !            90: ipc_thread_enqueue(
        !            91:        ipc_thread_queue_t      queue,
        !            92:        ipc_thread_t            thread)
        !            93: {
        !            94:        ipc_thread_enqueue_macro(queue, thread);
        !            95: }
        !            96: 
        !            97: /*
        !            98:  *     Routine:        ipc_thread_dequeue
        !            99:  *     Purpose:
        !           100:  *             Dequeue and return a thread.
        !           101:  */
        !           102: 
        !           103: ipc_thread_t
        !           104: ipc_thread_dequeue(
        !           105:        ipc_thread_queue_t      queue)
        !           106: {
        !           107:        ipc_thread_t first;
        !           108: 
        !           109:        first = ipc_thread_queue_first(queue);
        !           110: 
        !           111:        if (first != ITH_NULL)
        !           112:                ipc_thread_rmqueue_first_macro(queue, first);
        !           113: 
        !           114:        return first;
        !           115: }
        !           116: 
        !           117: /*
        !           118:  *     Routine:        ipc_thread_rmqueue
        !           119:  *     Purpose:
        !           120:  *             Pull a thread out of a queue.
        !           121:  */
        !           122: 
        !           123: void
        !           124: ipc_thread_rmqueue(
        !           125:        ipc_thread_queue_t      queue,
        !           126:        ipc_thread_t            thread)
        !           127: {
        !           128:        ipc_thread_t next, prev;
        !           129: 
        !           130:        assert(queue->ithq_base != ITH_NULL);
        !           131: 
        !           132:        next = thread->ith_next;
        !           133:        prev = thread->ith_prev;
        !           134: 
        !           135:        if (next == thread) {
        !           136:                assert(prev == thread);
        !           137:                assert(queue->ithq_base == thread);
        !           138: 
        !           139:                queue->ithq_base = ITH_NULL;
        !           140:        } else {
        !           141:                if (queue->ithq_base == thread)
        !           142:                        queue->ithq_base = next;
        !           143: 
        !           144:                next->ith_prev = prev;
        !           145:                prev->ith_next = next;
        !           146:                ipc_thread_links_init(thread);
        !           147:        }
        !           148: }

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