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Annotation of kernel/ipc/ipc_thread.h, 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.h
        !            75:  *     Author: Rich Draves
        !            76:  *     Date:   1989
        !            77:  *
        !            78:  *     Definitions for the IPC component of threads.
        !            79:  */
        !            80: 
        !            81: #ifndef        _IPC_IPC_THREAD_H_
        !            82: #define _IPC_IPC_THREAD_H_
        !            83: 
        !            84: #include <kern/thread.h>
        !            85: 
        !            86: typedef thread_t ipc_thread_t;
        !            87: 
        !            88: #define        ITH_NULL                THREAD_NULL
        !            89: 
        !            90: #define        ith_lock_init(thread)   simple_lock_init(&(thread)->ith_lock_data)
        !            91: #define        ith_lock(thread)        simple_lock(&(thread)->ith_lock_data)
        !            92: #define        ith_unlock(thread)      simple_unlock(&(thread)->ith_lock_data)
        !            93: 
        !            94: typedef struct ipc_thread_queue {
        !            95:        ipc_thread_t ithq_base;
        !            96: } *ipc_thread_queue_t;
        !            97: 
        !            98: #define        ITHQ_NULL               ((ipc_thread_queue_t) 0)
        !            99: 
        !           100: 
        !           101: #define        ipc_thread_links_init(thread)           \
        !           102: MACRO_BEGIN                                    \
        !           103:        (thread)->ith_next = (thread);          \
        !           104:        (thread)->ith_prev = (thread);          \
        !           105: MACRO_END
        !           106: 
        !           107: #define        ipc_thread_queue_init(queue)            \
        !           108: MACRO_BEGIN                                    \
        !           109:        (queue)->ithq_base = ITH_NULL;          \
        !           110: MACRO_END
        !           111: 
        !           112: #define        ipc_thread_queue_empty(queue)   ((queue)->ithq_base == ITH_NULL)
        !           113: 
        !           114: #define        ipc_thread_queue_first(queue)   ((queue)->ithq_base)
        !           115: 
        !           116: #define        ipc_thread_rmqueue_first_macro(queue, thread)                   \
        !           117: MACRO_BEGIN                                                            \
        !           118:        register ipc_thread_t _next;                                    \
        !           119:                                                                        \
        !           120:        assert((queue)->ithq_base == (thread));                         \
        !           121:                                                                        \
        !           122:        _next = (thread)->ith_next;                                     \
        !           123:        if (_next == (thread)) {                                        \
        !           124:                assert((thread)->ith_prev == (thread));                 \
        !           125:                (queue)->ithq_base = ITH_NULL;                          \
        !           126:        } else {                                                        \
        !           127:                register ipc_thread_t _prev = (thread)->ith_prev;       \
        !           128:                                                                        \
        !           129:                (queue)->ithq_base = _next;                             \
        !           130:                _next->ith_prev = _prev;                                \
        !           131:                _prev->ith_next = _next;                                \
        !           132:                ipc_thread_links_init(thread);                          \
        !           133:        }                                                               \
        !           134: MACRO_END
        !           135: 
        !           136: #define        ipc_thread_enqueue_macro(queue, thread)                         \
        !           137: MACRO_BEGIN                                                            \
        !           138:        register ipc_thread_t _first = (queue)->ithq_base;              \
        !           139:                                                                        \
        !           140:        if (_first == ITH_NULL) {                                       \
        !           141:                (queue)->ithq_base = (thread);                          \
        !           142:                assert((thread)->ith_next == (thread));                 \
        !           143:                assert((thread)->ith_prev == (thread));                 \
        !           144:        } else {                                                        \
        !           145:                register ipc_thread_t _last = _first->ith_prev;         \
        !           146:                                                                        \
        !           147:                (thread)->ith_next = _first;                            \
        !           148:                (thread)->ith_prev = _last;                             \
        !           149:                _first->ith_prev = (thread);                            \
        !           150:                _last->ith_next = (thread);                             \
        !           151:        }                                                               \
        !           152: MACRO_END
        !           153: 
        !           154: /* Enqueue a thread on a message queue */
        !           155: extern void ipc_thread_enqueue(
        !           156:        ipc_thread_queue_t      queue,
        !           157:        ipc_thread_t            thread);
        !           158: 
        !           159: /* Dequeue a thread from a message queue */
        !           160: extern ipc_thread_t ipc_thread_dequeue(
        !           161:        ipc_thread_queue_t      queue);
        !           162: 
        !           163: /* Remove a thread from a message queue */
        !           164: extern void ipc_thread_rmqueue(
        !           165:        ipc_thread_queue_t      queue,
        !           166:        ipc_thread_t            thread);
        !           167: 
        !           168: #endif /* _IPC_IPC_THREAD_H_ */

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