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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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