Pierre Riteau | c616bbe | 2009-11-30 18:21:20 +0100 | [diff] [blame] | 1 | /* $NetBSD: queue.h,v 1.52 2009/04/20 09:56:08 mschuett Exp $ */ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 2 | |
| 3 | /* |
| 4 | * Qemu version: Copy from netbsd, removed debug code, removed some of |
Pierre Riteau | c616bbe | 2009-11-30 18:21:20 +0100 | [diff] [blame] | 5 | * the implementations. Left in lists, simple queues, tail queues and |
| 6 | * circular queues. |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * Copyright (c) 1991, 1993 |
| 11 | * The Regents of the University of California. All rights reserved. |
| 12 | * |
| 13 | * Redistribution and use in source and binary forms, with or without |
| 14 | * modification, are permitted provided that the following conditions |
| 15 | * are met: |
| 16 | * 1. Redistributions of source code must retain the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer. |
| 18 | * 2. Redistributions in binary form must reproduce the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer in the |
| 20 | * documentation and/or other materials provided with the distribution. |
| 21 | * 3. Neither the name of the University nor the names of its contributors |
| 22 | * may be used to endorse or promote products derived from this software |
| 23 | * without specific prior written permission. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 26 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 30 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 31 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 32 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 33 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 34 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 35 | * SUCH DAMAGE. |
| 36 | * |
| 37 | * @(#)queue.h 8.5 (Berkeley) 8/20/94 |
| 38 | */ |
| 39 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 40 | #ifndef QEMU_SYS_QUEUE_H_ |
| 41 | #define QEMU_SYS_QUEUE_H_ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 42 | |
| 43 | /* |
Pierre Riteau | c616bbe | 2009-11-30 18:21:20 +0100 | [diff] [blame] | 44 | * This file defines four types of data structures: |
| 45 | * lists, simple queues, tail queues, and circular queues. |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 46 | * |
| 47 | * A list is headed by a single forward pointer (or an array of forward |
| 48 | * pointers for a hash table header). The elements are doubly linked |
| 49 | * so that an arbitrary element can be removed without a need to |
| 50 | * traverse the list. New elements can be added to the list before |
| 51 | * or after an existing element or at the head of the list. A list |
| 52 | * may only be traversed in the forward direction. |
| 53 | * |
Pierre Riteau | c616bbe | 2009-11-30 18:21:20 +0100 | [diff] [blame] | 54 | * A simple queue is headed by a pair of pointers, one the head of the |
| 55 | * list and the other to the tail of the list. The elements are singly |
| 56 | * linked to save space, so elements can only be removed from the |
| 57 | * head of the list. New elements can be added to the list after |
| 58 | * an existing element, at the head of the list, or at the end of the |
| 59 | * list. A simple queue may only be traversed in the forward direction. |
| 60 | * |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 61 | * A tail queue is headed by a pair of pointers, one to the head of the |
| 62 | * list and the other to the tail of the list. The elements are doubly |
| 63 | * linked so that an arbitrary element can be removed without a need to |
| 64 | * traverse the list. New elements can be added to the list before or |
| 65 | * after an existing element, at the head of the list, or at the end of |
| 66 | * the list. A tail queue may be traversed in either direction. |
| 67 | * |
| 68 | * A circle queue is headed by a pair of pointers, one to the head of the |
| 69 | * list and the other to the tail of the list. The elements are doubly |
| 70 | * linked so that an arbitrary element can be removed without a need to |
| 71 | * traverse the list. New elements can be added to the list before or after |
| 72 | * an existing element, at the head of the list, or at the end of the list. |
| 73 | * A circle queue may be traversed in either direction, but has a more |
| 74 | * complex end of list detection. |
| 75 | * |
| 76 | * For details on the use of these macros, see the queue(3) manual page. |
| 77 | */ |
| 78 | |
Harsh Prateek Bora | 5f7d05e | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 79 | #include "qemu-barrier.h" /* for smp_wmb() */ |
| 80 | |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 81 | /* |
| 82 | * List definitions. |
| 83 | */ |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 84 | #define QLIST_HEAD(name, type) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 85 | struct name { \ |
| 86 | struct type *lh_first; /* first element */ \ |
| 87 | } |
| 88 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 89 | #define QLIST_HEAD_INITIALIZER(head) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 90 | { NULL } |
| 91 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 92 | #define QLIST_ENTRY(type) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 93 | struct { \ |
| 94 | struct type *le_next; /* next element */ \ |
| 95 | struct type **le_prev; /* address of previous next element */ \ |
| 96 | } |
| 97 | |
| 98 | /* |
| 99 | * List functions. |
| 100 | */ |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 101 | #define QLIST_INIT(head) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 102 | (head)->lh_first = NULL; \ |
| 103 | } while (/*CONSTCOND*/0) |
| 104 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 105 | #define QLIST_INSERT_AFTER(listelm, elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 106 | if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \ |
| 107 | (listelm)->field.le_next->field.le_prev = \ |
| 108 | &(elm)->field.le_next; \ |
| 109 | (listelm)->field.le_next = (elm); \ |
| 110 | (elm)->field.le_prev = &(listelm)->field.le_next; \ |
| 111 | } while (/*CONSTCOND*/0) |
| 112 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 113 | #define QLIST_INSERT_BEFORE(listelm, elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 114 | (elm)->field.le_prev = (listelm)->field.le_prev; \ |
| 115 | (elm)->field.le_next = (listelm); \ |
| 116 | *(listelm)->field.le_prev = (elm); \ |
| 117 | (listelm)->field.le_prev = &(elm)->field.le_next; \ |
| 118 | } while (/*CONSTCOND*/0) |
| 119 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 120 | #define QLIST_INSERT_HEAD(head, elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 121 | if (((elm)->field.le_next = (head)->lh_first) != NULL) \ |
| 122 | (head)->lh_first->field.le_prev = &(elm)->field.le_next;\ |
| 123 | (head)->lh_first = (elm); \ |
| 124 | (elm)->field.le_prev = &(head)->lh_first; \ |
| 125 | } while (/*CONSTCOND*/0) |
| 126 | |
Harsh Prateek Bora | 5f7d05e | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 127 | #define QLIST_INSERT_HEAD_RCU(head, elm, field) do { \ |
| 128 | (elm)->field.le_prev = &(head)->lh_first; \ |
| 129 | (elm)->field.le_next = (head)->lh_first; \ |
| 130 | smp_wmb(); /* fill elm before linking it */ \ |
| 131 | if ((head)->lh_first != NULL) { \ |
| 132 | (head)->lh_first->field.le_prev = &(elm)->field.le_next; \ |
| 133 | } \ |
| 134 | (head)->lh_first = (elm); \ |
| 135 | smp_wmb(); \ |
| 136 | } while (/* CONSTCOND*/0) |
| 137 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 138 | #define QLIST_REMOVE(elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 139 | if ((elm)->field.le_next != NULL) \ |
| 140 | (elm)->field.le_next->field.le_prev = \ |
| 141 | (elm)->field.le_prev; \ |
| 142 | *(elm)->field.le_prev = (elm)->field.le_next; \ |
| 143 | } while (/*CONSTCOND*/0) |
| 144 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 145 | #define QLIST_FOREACH(var, head, field) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 146 | for ((var) = ((head)->lh_first); \ |
| 147 | (var); \ |
| 148 | (var) = ((var)->field.le_next)) |
| 149 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 150 | #define QLIST_FOREACH_SAFE(var, head, field, next_var) \ |
Juan Quintela | bb150dc | 2009-09-01 02:12:32 +0200 | [diff] [blame] | 151 | for ((var) = ((head)->lh_first); \ |
| 152 | (var) && ((next_var) = ((var)->field.le_next), 1); \ |
| 153 | (var) = (next_var)) |
| 154 | |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 155 | /* |
| 156 | * List access methods. |
| 157 | */ |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 158 | #define QLIST_EMPTY(head) ((head)->lh_first == NULL) |
| 159 | #define QLIST_FIRST(head) ((head)->lh_first) |
| 160 | #define QLIST_NEXT(elm, field) ((elm)->field.le_next) |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 161 | |
| 162 | |
| 163 | /* |
Pierre Riteau | c616bbe | 2009-11-30 18:21:20 +0100 | [diff] [blame] | 164 | * Simple queue definitions. |
| 165 | */ |
| 166 | #define QSIMPLEQ_HEAD(name, type) \ |
| 167 | struct name { \ |
| 168 | struct type *sqh_first; /* first element */ \ |
| 169 | struct type **sqh_last; /* addr of last next element */ \ |
| 170 | } |
| 171 | |
| 172 | #define QSIMPLEQ_HEAD_INITIALIZER(head) \ |
| 173 | { NULL, &(head).sqh_first } |
| 174 | |
| 175 | #define QSIMPLEQ_ENTRY(type) \ |
| 176 | struct { \ |
| 177 | struct type *sqe_next; /* next element */ \ |
| 178 | } |
| 179 | |
| 180 | /* |
| 181 | * Simple queue functions. |
| 182 | */ |
| 183 | #define QSIMPLEQ_INIT(head) do { \ |
| 184 | (head)->sqh_first = NULL; \ |
| 185 | (head)->sqh_last = &(head)->sqh_first; \ |
| 186 | } while (/*CONSTCOND*/0) |
| 187 | |
| 188 | #define QSIMPLEQ_INSERT_HEAD(head, elm, field) do { \ |
| 189 | if (((elm)->field.sqe_next = (head)->sqh_first) == NULL) \ |
| 190 | (head)->sqh_last = &(elm)->field.sqe_next; \ |
| 191 | (head)->sqh_first = (elm); \ |
| 192 | } while (/*CONSTCOND*/0) |
| 193 | |
| 194 | #define QSIMPLEQ_INSERT_TAIL(head, elm, field) do { \ |
| 195 | (elm)->field.sqe_next = NULL; \ |
| 196 | *(head)->sqh_last = (elm); \ |
| 197 | (head)->sqh_last = &(elm)->field.sqe_next; \ |
| 198 | } while (/*CONSTCOND*/0) |
| 199 | |
| 200 | #define QSIMPLEQ_INSERT_AFTER(head, listelm, elm, field) do { \ |
| 201 | if (((elm)->field.sqe_next = (listelm)->field.sqe_next) == NULL) \ |
| 202 | (head)->sqh_last = &(elm)->field.sqe_next; \ |
| 203 | (listelm)->field.sqe_next = (elm); \ |
| 204 | } while (/*CONSTCOND*/0) |
| 205 | |
| 206 | #define QSIMPLEQ_REMOVE_HEAD(head, field) do { \ |
| 207 | if (((head)->sqh_first = (head)->sqh_first->field.sqe_next) == NULL)\ |
| 208 | (head)->sqh_last = &(head)->sqh_first; \ |
| 209 | } while (/*CONSTCOND*/0) |
| 210 | |
| 211 | #define QSIMPLEQ_REMOVE(head, elm, type, field) do { \ |
| 212 | if ((head)->sqh_first == (elm)) { \ |
| 213 | QSIMPLEQ_REMOVE_HEAD((head), field); \ |
| 214 | } else { \ |
| 215 | struct type *curelm = (head)->sqh_first; \ |
| 216 | while (curelm->field.sqe_next != (elm)) \ |
| 217 | curelm = curelm->field.sqe_next; \ |
| 218 | if ((curelm->field.sqe_next = \ |
| 219 | curelm->field.sqe_next->field.sqe_next) == NULL) \ |
| 220 | (head)->sqh_last = &(curelm)->field.sqe_next; \ |
| 221 | } \ |
| 222 | } while (/*CONSTCOND*/0) |
| 223 | |
| 224 | #define QSIMPLEQ_FOREACH(var, head, field) \ |
| 225 | for ((var) = ((head)->sqh_first); \ |
| 226 | (var); \ |
| 227 | (var) = ((var)->field.sqe_next)) |
| 228 | |
| 229 | #define QSIMPLEQ_FOREACH_SAFE(var, head, field, next) \ |
| 230 | for ((var) = ((head)->sqh_first); \ |
| 231 | (var) && ((next = ((var)->field.sqe_next)), 1); \ |
| 232 | (var) = (next)) |
| 233 | |
| 234 | #define QSIMPLEQ_CONCAT(head1, head2) do { \ |
| 235 | if (!QSIMPLEQ_EMPTY((head2))) { \ |
| 236 | *(head1)->sqh_last = (head2)->sqh_first; \ |
| 237 | (head1)->sqh_last = (head2)->sqh_last; \ |
| 238 | QSIMPLEQ_INIT((head2)); \ |
| 239 | } \ |
| 240 | } while (/*CONSTCOND*/0) |
| 241 | |
| 242 | #define QSIMPLEQ_LAST(head, type, field) \ |
| 243 | (QSIMPLEQ_EMPTY((head)) ? \ |
| 244 | NULL : \ |
| 245 | ((struct type *)(void *) \ |
| 246 | ((char *)((head)->sqh_last) - offsetof(struct type, field)))) |
| 247 | |
| 248 | /* |
| 249 | * Simple queue access methods. |
| 250 | */ |
| 251 | #define QSIMPLEQ_EMPTY(head) ((head)->sqh_first == NULL) |
| 252 | #define QSIMPLEQ_FIRST(head) ((head)->sqh_first) |
| 253 | #define QSIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next) |
| 254 | |
| 255 | |
| 256 | /* |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 257 | * Tail queue definitions. |
| 258 | */ |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 259 | #define Q_TAILQ_HEAD(name, type, qual) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 260 | struct name { \ |
| 261 | qual type *tqh_first; /* first element */ \ |
| 262 | qual type *qual *tqh_last; /* addr of last next element */ \ |
| 263 | } |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 264 | #define QTAILQ_HEAD(name, type) Q_TAILQ_HEAD(name, struct type,) |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 265 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 266 | #define QTAILQ_HEAD_INITIALIZER(head) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 267 | { NULL, &(head).tqh_first } |
| 268 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 269 | #define Q_TAILQ_ENTRY(type, qual) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 270 | struct { \ |
| 271 | qual type *tqe_next; /* next element */ \ |
| 272 | qual type *qual *tqe_prev; /* address of previous next element */\ |
| 273 | } |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 274 | #define QTAILQ_ENTRY(type) Q_TAILQ_ENTRY(struct type,) |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 275 | |
| 276 | /* |
| 277 | * Tail queue functions. |
| 278 | */ |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 279 | #define QTAILQ_INIT(head) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 280 | (head)->tqh_first = NULL; \ |
| 281 | (head)->tqh_last = &(head)->tqh_first; \ |
| 282 | } while (/*CONSTCOND*/0) |
| 283 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 284 | #define QTAILQ_INSERT_HEAD(head, elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 285 | if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \ |
| 286 | (head)->tqh_first->field.tqe_prev = \ |
| 287 | &(elm)->field.tqe_next; \ |
| 288 | else \ |
| 289 | (head)->tqh_last = &(elm)->field.tqe_next; \ |
| 290 | (head)->tqh_first = (elm); \ |
| 291 | (elm)->field.tqe_prev = &(head)->tqh_first; \ |
| 292 | } while (/*CONSTCOND*/0) |
| 293 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 294 | #define QTAILQ_INSERT_TAIL(head, elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 295 | (elm)->field.tqe_next = NULL; \ |
| 296 | (elm)->field.tqe_prev = (head)->tqh_last; \ |
| 297 | *(head)->tqh_last = (elm); \ |
| 298 | (head)->tqh_last = &(elm)->field.tqe_next; \ |
| 299 | } while (/*CONSTCOND*/0) |
| 300 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 301 | #define QTAILQ_INSERT_AFTER(head, listelm, elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 302 | if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\ |
| 303 | (elm)->field.tqe_next->field.tqe_prev = \ |
| 304 | &(elm)->field.tqe_next; \ |
| 305 | else \ |
| 306 | (head)->tqh_last = &(elm)->field.tqe_next; \ |
| 307 | (listelm)->field.tqe_next = (elm); \ |
| 308 | (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \ |
| 309 | } while (/*CONSTCOND*/0) |
| 310 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 311 | #define QTAILQ_INSERT_BEFORE(listelm, elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 312 | (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \ |
| 313 | (elm)->field.tqe_next = (listelm); \ |
| 314 | *(listelm)->field.tqe_prev = (elm); \ |
| 315 | (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \ |
| 316 | } while (/*CONSTCOND*/0) |
| 317 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 318 | #define QTAILQ_REMOVE(head, elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 319 | if (((elm)->field.tqe_next) != NULL) \ |
| 320 | (elm)->field.tqe_next->field.tqe_prev = \ |
| 321 | (elm)->field.tqe_prev; \ |
| 322 | else \ |
| 323 | (head)->tqh_last = (elm)->field.tqe_prev; \ |
| 324 | *(elm)->field.tqe_prev = (elm)->field.tqe_next; \ |
| 325 | } while (/*CONSTCOND*/0) |
| 326 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 327 | #define QTAILQ_FOREACH(var, head, field) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 328 | for ((var) = ((head)->tqh_first); \ |
| 329 | (var); \ |
| 330 | (var) = ((var)->field.tqe_next)) |
| 331 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 332 | #define QTAILQ_FOREACH_SAFE(var, head, field, next_var) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 333 | for ((var) = ((head)->tqh_first); \ |
| 334 | (var) && ((next_var) = ((var)->field.tqe_next), 1); \ |
| 335 | (var) = (next_var)) |
| 336 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 337 | #define QTAILQ_FOREACH_REVERSE(var, head, headname, field) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 338 | for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last)); \ |
| 339 | (var); \ |
| 340 | (var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last))) |
| 341 | |
| 342 | /* |
| 343 | * Tail queue access methods. |
| 344 | */ |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 345 | #define QTAILQ_EMPTY(head) ((head)->tqh_first == NULL) |
| 346 | #define QTAILQ_FIRST(head) ((head)->tqh_first) |
| 347 | #define QTAILQ_NEXT(elm, field) ((elm)->field.tqe_next) |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 348 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 349 | #define QTAILQ_LAST(head, headname) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 350 | (*(((struct headname *)((head)->tqh_last))->tqh_last)) |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 351 | #define QTAILQ_PREV(elm, headname, field) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 352 | (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last)) |
| 353 | |
| 354 | |
| 355 | /* |
| 356 | * Circular queue definitions. |
| 357 | */ |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 358 | #define QCIRCLEQ_HEAD(name, type) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 359 | struct name { \ |
| 360 | struct type *cqh_first; /* first element */ \ |
| 361 | struct type *cqh_last; /* last element */ \ |
| 362 | } |
| 363 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 364 | #define QCIRCLEQ_HEAD_INITIALIZER(head) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 365 | { (void *)&head, (void *)&head } |
| 366 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 367 | #define QCIRCLEQ_ENTRY(type) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 368 | struct { \ |
| 369 | struct type *cqe_next; /* next element */ \ |
| 370 | struct type *cqe_prev; /* previous element */ \ |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * Circular queue functions. |
| 375 | */ |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 376 | #define QCIRCLEQ_INIT(head) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 377 | (head)->cqh_first = (void *)(head); \ |
| 378 | (head)->cqh_last = (void *)(head); \ |
| 379 | } while (/*CONSTCOND*/0) |
| 380 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 381 | #define QCIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 382 | (elm)->field.cqe_next = (listelm)->field.cqe_next; \ |
| 383 | (elm)->field.cqe_prev = (listelm); \ |
| 384 | if ((listelm)->field.cqe_next == (void *)(head)) \ |
| 385 | (head)->cqh_last = (elm); \ |
| 386 | else \ |
| 387 | (listelm)->field.cqe_next->field.cqe_prev = (elm); \ |
| 388 | (listelm)->field.cqe_next = (elm); \ |
| 389 | } while (/*CONSTCOND*/0) |
| 390 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 391 | #define QCIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 392 | (elm)->field.cqe_next = (listelm); \ |
| 393 | (elm)->field.cqe_prev = (listelm)->field.cqe_prev; \ |
| 394 | if ((listelm)->field.cqe_prev == (void *)(head)) \ |
| 395 | (head)->cqh_first = (elm); \ |
| 396 | else \ |
| 397 | (listelm)->field.cqe_prev->field.cqe_next = (elm); \ |
| 398 | (listelm)->field.cqe_prev = (elm); \ |
| 399 | } while (/*CONSTCOND*/0) |
| 400 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 401 | #define QCIRCLEQ_INSERT_HEAD(head, elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 402 | (elm)->field.cqe_next = (head)->cqh_first; \ |
| 403 | (elm)->field.cqe_prev = (void *)(head); \ |
| 404 | if ((head)->cqh_last == (void *)(head)) \ |
| 405 | (head)->cqh_last = (elm); \ |
| 406 | else \ |
| 407 | (head)->cqh_first->field.cqe_prev = (elm); \ |
| 408 | (head)->cqh_first = (elm); \ |
| 409 | } while (/*CONSTCOND*/0) |
| 410 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 411 | #define QCIRCLEQ_INSERT_TAIL(head, elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 412 | (elm)->field.cqe_next = (void *)(head); \ |
| 413 | (elm)->field.cqe_prev = (head)->cqh_last; \ |
| 414 | if ((head)->cqh_first == (void *)(head)) \ |
| 415 | (head)->cqh_first = (elm); \ |
| 416 | else \ |
| 417 | (head)->cqh_last->field.cqe_next = (elm); \ |
| 418 | (head)->cqh_last = (elm); \ |
| 419 | } while (/*CONSTCOND*/0) |
| 420 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 421 | #define QCIRCLEQ_REMOVE(head, elm, field) do { \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 422 | if ((elm)->field.cqe_next == (void *)(head)) \ |
| 423 | (head)->cqh_last = (elm)->field.cqe_prev; \ |
| 424 | else \ |
| 425 | (elm)->field.cqe_next->field.cqe_prev = \ |
| 426 | (elm)->field.cqe_prev; \ |
| 427 | if ((elm)->field.cqe_prev == (void *)(head)) \ |
| 428 | (head)->cqh_first = (elm)->field.cqe_next; \ |
| 429 | else \ |
| 430 | (elm)->field.cqe_prev->field.cqe_next = \ |
| 431 | (elm)->field.cqe_next; \ |
| 432 | } while (/*CONSTCOND*/0) |
| 433 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 434 | #define QCIRCLEQ_FOREACH(var, head, field) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 435 | for ((var) = ((head)->cqh_first); \ |
| 436 | (var) != (const void *)(head); \ |
| 437 | (var) = ((var)->field.cqe_next)) |
| 438 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 439 | #define QCIRCLEQ_FOREACH_REVERSE(var, head, field) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 440 | for ((var) = ((head)->cqh_last); \ |
| 441 | (var) != (const void *)(head); \ |
| 442 | (var) = ((var)->field.cqe_prev)) |
| 443 | |
| 444 | /* |
| 445 | * Circular queue access methods. |
| 446 | */ |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 447 | #define QCIRCLEQ_EMPTY(head) ((head)->cqh_first == (void *)(head)) |
| 448 | #define QCIRCLEQ_FIRST(head) ((head)->cqh_first) |
| 449 | #define QCIRCLEQ_LAST(head) ((head)->cqh_last) |
| 450 | #define QCIRCLEQ_NEXT(elm, field) ((elm)->field.cqe_next) |
| 451 | #define QCIRCLEQ_PREV(elm, field) ((elm)->field.cqe_prev) |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 452 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 453 | #define QCIRCLEQ_LOOP_NEXT(head, elm, field) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 454 | (((elm)->field.cqe_next == (void *)(head)) \ |
| 455 | ? ((head)->cqh_first) \ |
| 456 | : (elm->field.cqe_next)) |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 457 | #define QCIRCLEQ_LOOP_PREV(head, elm, field) \ |
blueswir1 | fc56ef0 | 2008-12-14 08:53:17 +0000 | [diff] [blame] | 458 | (((elm)->field.cqe_prev == (void *)(head)) \ |
| 459 | ? ((head)->cqh_last) \ |
| 460 | : (elm->field.cqe_prev)) |
| 461 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 462 | #endif /* !QEMU_SYS_QUEUE_H_ */ |