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1.1 root 1: /*
2: * Copyright (c) 1991 Regents of the University of California.
3: * All rights reserved.
4: *
5: * This code is derived from software contributed to Berkeley by
6: * The Mach Operating System project at Carnegie-Mellon University.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: *
1.1.1.2 ! root 36: * from: @(#)queue.h 7.3 (Berkeley) 4/21/91
! 37: * queue.h,v 1.3 1993/05/20 03:59:14 cgd Exp
1.1 root 38: *
39: *
40: * Copyright (c) 1987, 1990 Carnegie-Mellon University.
41: * All rights reserved.
42: *
43: * Author: Avadis Tevanian, Jr.
44: *
45: * Permission to use, copy, modify and distribute this software and
46: * its documentation is hereby granted, provided that both the copyright
47: * notice and this permission notice appear in all copies of the
48: * software, derivative works or modified versions, and any portions
49: * thereof, and that both notices appear in supporting documentation.
50: *
51: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
52: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
53: * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
54: *
55: * Carnegie Mellon requests users of this software to return to
56: *
57: * Software Distribution Coordinator or [email protected]
58: * School of Computer Science
59: * Carnegie Mellon University
60: * Pittsburgh PA 15213-3890
61: *
62: * any improvements or extensions that they make and grant Carnegie the
63: * rights to redistribute these changes.
64: */
65:
1.1.1.2 ! root 66: #ifndef _VM_QUEUE_H_
! 67: #define _VM_QUEUE_H_
! 68:
1.1 root 69: /*
70: * Type definitions for generic queues.
71: */
72:
73: struct queue_entry {
74: struct queue_entry *next; /* next element */
75: struct queue_entry *prev; /* previous element */
76: };
77:
78: typedef struct queue_entry *queue_t;
79: typedef struct queue_entry queue_head_t;
80: typedef struct queue_entry queue_chain_t;
81: typedef struct queue_entry *queue_entry_t;
82:
83: #define round_queue(size) (((size)+7) & (~7))
84:
85: #define enqueue(queue,elt) enqueue_tail(queue, elt)
86: #define dequeue(queue) dequeue_head(queue)
87:
88: #define enqueue_head(queue,elt) insque(elt,queue)
89: #define enqueue_tail(queue,elt) insque(elt,(queue)->prev)
90: #define remqueue(queue,elt) remque(elt)
91:
92: #define queue_init(q) ((q)->next = (q)->prev = q)
93: #define queue_first(q) ((q)->next)
94: #define queue_next(qc) ((qc)->next)
95: #define queue_end(q, qe) ((q) == (qe))
96: #define queue_empty(q) queue_end((q), queue_first(q))
97:
98: #define queue_enter(head, elt, type, field) { \
99: if (queue_empty((head))) { \
100: (head)->next = (queue_entry_t) elt; \
101: (head)->prev = (queue_entry_t) elt; \
102: (elt)->field.next = head; \
103: (elt)->field.prev = head; \
104: } else { \
105: register queue_entry_t prev = (head)->prev; \
106: (elt)->field.prev = prev; \
107: (elt)->field.next = head; \
108: (head)->prev = (queue_entry_t)(elt); \
109: ((type)prev)->field.next = (queue_entry_t)(elt);\
110: } \
111: }
112:
113: #define queue_field(head, thing, type, field) \
114: (((head) == (thing)) ? (head) : &((type)(thing))->field)
115:
116: #define queue_remove(head, elt, type, field) { \
117: register queue_entry_t next = (elt)->field.next; \
118: register queue_entry_t prev = (elt)->field.prev; \
119: queue_field((head), next, type, field)->prev = prev; \
120: queue_field((head), prev, type, field)->next = next; \
121: }
122:
123: #define queue_assign(to, from, type, field) { \
124: ((type)((from)->prev))->field.next = (to); \
125: ((type)((from)->next))->field.prev = (to); \
126: *to = *from; \
127: }
128:
129: #define queue_remove_first(h, e, t, f) { \
130: e = (t) queue_first((h)); \
131: queue_remove((h), (e), t, f); \
132: }
133:
1.1.1.2 ! root 134: #endif /* !_VM_QUEUE_H_ */
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