projects / mirror_frr.git / blame
| Commit | Line | Data |
|---|---|---|
| cd85bc2e JB |
1 | /*- |
| 2 | * Copyright (c) 1991, 1993 | |
| 3 | * The Regents of the University of California. All rights reserved. | |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms, with or without | |
| 6 | * modification, are permitted provided that the following conditions | |
| 7 | * are met: | |
| 8 | * 1. Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * 4. Neither the name of the University nor the names of its contributors | |
| 14 | * may be used to endorse or promote products derived from this software | |
| 15 | * without specific prior written permission. | |
| 16 | * | |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 27 | * SUCH DAMAGE. | |
| 28 | * | |
| 29 | * @(#)queue.h 8.5 (Berkeley) 8/20/94 | |
| 30 | * $FreeBSD$ | |
| 31 | */ | |
| 32 | ||
| 33 | #ifndef _SYS_QUEUE_H_ | |
| 34 | #define _SYS_QUEUE_H_ | |
| 35 | ||
| 36 | /* | |
| 37 | * This file defines four types of data structures: singly-linked lists, | |
| 38 | * singly-linked tail queues, lists and tail queues. | |
| 39 | * | |
| 40 | * A singly-linked list is headed by a single forward pointer. The elements | |
| 41 | * are singly linked for minimum space and pointer manipulation overhead at | |
| 42 | * the expense of O(n) removal for arbitrary elements. New elements can be | |
| 43 | * added to the list after an existing element or at the head of the list. | |
| 44 | * Elements being removed from the head of the list should use the explicit | |
| 45 | * macro for this purpose for optimum efficiency. A singly-linked list may | |
| 46 | * only be traversed in the forward direction. Singly-linked lists are ideal | |
| 47 | * for applications with large datasets and few or no removals or for | |
| 48 | * implementing a LIFO queue. | |
| 49 | * | |
| 50 | * A singly-linked tail queue is headed by a pair of pointers, one to the | |
| 51 | * head of the list and the other to the tail of the list. The elements are | |
| 52 | * singly linked for minimum space and pointer manipulation overhead at the | |
| 53 | * expense of O(n) removal for arbitrary elements. New elements can be added | |
| 54 | * to the list after an existing element, at the head of the list, or at the | |
| 55 | * end of the list. Elements being removed from the head of the tail queue | |
| 56 | * should use the explicit macro for this purpose for optimum efficiency. | |
| 57 | * A singly-linked tail queue may only be traversed in the forward direction. | |
| 58 | * Singly-linked tail queues are ideal for applications with large datasets | |
| 59 | * and few or no removals or for implementing a FIFO queue. | |
| 60 | * | |
| 61 | * A list is headed by a single forward pointer (or an array of forward | |
| 62 | * pointers for a hash table header). The elements are doubly linked | |
| 63 | * 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 | |
| 65 | * or after an existing element or at the head of the list. A list | |
| 66 | * may only be traversed in the forward direction. | |
| 67 | * | |
| 68 | * A tail 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 | |
| 72 | * after an existing element, at the head of the list, or at the end of | |
| 73 | * the list. A tail queue may be traversed in either direction. | |
| 74 | * | |
| 75 | * For details on the use of these macros, see the queue(3) manual page. | |
| 76 | * | |
| 77 | * | |
| 78 | * SLIST LIST STAILQ TAILQ | |
| 79 | * _HEAD + + + + | |
| 80 | * _HEAD_INITIALIZER + + + + | |
| 81 | * _ENTRY + + + + | |
| 82 | * _INIT + + + + | |
| 83 | * _EMPTY + + + + | |
| 84 | * _FIRST + + + + | |
| 85 | * _NEXT + + + + | |
| 86 | * _PREV - - - + | |
| 87 | * _LAST - - + + | |
| 88 | * _FOREACH + + + + | |
| 89 | * _FOREACH_SAFE + + + + | |
| 90 | * _FOREACH_REVERSE - - - + | |
| 91 | * _FOREACH_REVERSE_SAFE - - - + | |
| 92 | * _INSERT_HEAD + + + + | |
| 93 | * _INSERT_BEFORE - + - + | |
| 94 | * _INSERT_AFTER + + + + | |
| 95 | * _INSERT_TAIL - - + + | |
| 96 | * _CONCAT - - + + | |
| 97 | * _REMOVE_AFTER + - + - | |
| 98 | * _REMOVE_HEAD + - + - | |
| 99 | * _REMOVE + + + + | |
| 100 | * _SWAP + + + + | |
| 101 | * | |
| 102 | */ | |
| 103 | #ifdef QUEUE_MACRO_DEBUG | |
| 104 | /* Store the last 2 places the queue element or head was altered */ | |
| 105 | struct qm_trace { | |
| 106 | char *lastfile; | |
| 107 | int lastline; | |
| 108 | char *prevfile; | |
| 109 | int prevline; | |
| 110 | }; | |
| 111 | ||
| 112 | #define TRACEBUF struct qm_trace trace; | |
| 113 | #define TRASHIT(x) do {(x) = (void *)-1;} while (0) | |
| 114 | #define QMD_SAVELINK(name, link) void **name = (void *)&(link) | |
| 115 | ||
| 116 | #define QMD_TRACE_HEAD(head) \ | |
| 117 | do { \ | |
| 118 | (head)->trace.prevline = (head)->trace.lastline; \ | |
| 119 | (head)->trace.prevfile = (head)->trace.lastfile; \ | |
| 120 | (head)->trace.lastline = __LINE__; \ | |
| 121 | (head)->trace.lastfile = __FILE__; \ | |
| 122 | } while (0) | |
| 123 | ||
| 124 | #define QMD_TRACE_ELEM(elem) \ | |
| 125 | do { \ | |
| 126 | (elem)->trace.prevline = (elem)->trace.lastline; \ | |
| 127 | (elem)->trace.prevfile = (elem)->trace.lastfile; \ | |
| 128 | (elem)->trace.lastline = __LINE__; \ | |
| 129 | (elem)->trace.lastfile = __FILE__; \ | |
| 130 | } while (0) | |
| 131 | ||
| 132 | #else | |
| 133 | #define QMD_TRACE_ELEM(elem) | |
| 134 | #define QMD_TRACE_HEAD(head) | |
| 135 | #define QMD_SAVELINK(name, link) | |
| 136 | #define TRACEBUF | |
| 137 | #define TRASHIT(x) | |
| 138 | #endif /* QUEUE_MACRO_DEBUG */ | |
| 139 | ||
| 140 | /* | |
| 141 | * Singly-linked List declarations. | |
| 142 | */ | |
| 143 | #define SLIST_HEAD(name, type) \ | |
| 144 | struct name { \ | |
| 145 | struct type *slh_first; /* first element */ \ | |
| 146 | } | |
| 147 | ||
| 148 | #define SLIST_HEAD_INITIALIZER(head) \ | |
| 149 | { \ | |
| 150 | NULL \ | |
| 151 | } | |
| 152 | ||
| 153 | #define SLIST_ENTRY(type) \ | |
| 154 | struct { \ | |
| 155 | struct type *sle_next; /* next element */ \ | |
| 156 | } | |
| 157 | ||
| 158 | /* | |
| 159 | * Singly-linked List functions. | |
| 160 | */ | |
| 161 | #define SLIST_EMPTY(head) ((head)->slh_first == NULL) | |
| 162 | ||
| 163 | #define SLIST_FIRST(head) ((head)->slh_first) | |
| 164 | ||
| 165 | #define SLIST_FOREACH(var, head, field) \ | |
| 166 | for ((var) = SLIST_FIRST((head)); (var); \ | |
| 167 | (var) = SLIST_NEXT((var), field)) | |
| 168 | ||
| 169 | #define SLIST_FOREACH_SAFE(var, head, field, tvar) \ | |
| 170 | for ((var) = SLIST_FIRST((head)); \ | |
| 171 | (var) && ((tvar) = SLIST_NEXT((var), field), 1); (var) = (tvar)) | |
| 172 | ||
| 173 | #define SLIST_FOREACH_PREVPTR(var, varp, head, field) \ | |
| 174 | for ((varp) = &SLIST_FIRST((head)); ((var) = *(varp)) != NULL; \ | |
| 175 | (varp) = &SLIST_NEXT((var), field)) | |
| 176 | ||
| 177 | #define SLIST_INIT(head) \ | |
| 178 | do { \ | |
| 179 | SLIST_FIRST((head)) = NULL; \ | |
| 180 | } while (0) | |
| 181 | ||
| 182 | #define SLIST_INSERT_AFTER(slistelm, elm, field) \ | |
| 183 | do { \ | |
| 184 | SLIST_NEXT((elm), field) = SLIST_NEXT((slistelm), field); \ | |
| 185 | SLIST_NEXT((slistelm), field) = (elm); \ | |
| 186 | } while (0) | |
| 187 | ||
| 188 | #define SLIST_INSERT_HEAD(head, elm, field) \ | |
| 189 | do { \ | |
| 190 | SLIST_NEXT((elm), field) = SLIST_FIRST((head)); \ | |
| 191 | SLIST_FIRST((head)) = (elm); \ | |
| 192 | } while (0) | |
| 193 | ||
| 194 | #define SLIST_NEXT(elm, field) ((elm)->field.sle_next) | |
| 195 | ||
| 196 | #define SLIST_REMOVE(head, elm, type, field) \ | |
| 197 | do { \ | |
| 198 | QMD_SAVELINK(oldnext, (elm)->field.sle_next); \ | |
| 199 | if (SLIST_FIRST((head)) == (elm)) { \ | |
| 200 | SLIST_REMOVE_HEAD((head), field); \ | |
| 201 | } else { \ | |
| 202 | struct type *curelm = SLIST_FIRST((head)); \ | |
| 203 | while (SLIST_NEXT(curelm, field) != (elm)) \ | |
| 204 | curelm = SLIST_NEXT(curelm, field); \ | |
| 205 | SLIST_REMOVE_AFTER(curelm, field); \ | |
| 206 | } \ | |
| 207 | TRASHIT(*oldnext); \ | |
| 208 | } while (0) | |
| 209 | ||
| 210 | #define SLIST_REMOVE_AFTER(elm, field) \ | |
| 211 | do { \ | |
| 212 | SLIST_NEXT(elm, field) = \ | |
| 213 | SLIST_NEXT(SLIST_NEXT(elm, field), field); \ | |
| 214 | } while (0) | |
| 215 | ||
| 216 | #define SLIST_REMOVE_HEAD(head, field) \ | |
| 217 | do { \ | |
| 218 | SLIST_FIRST((head)) = SLIST_NEXT(SLIST_FIRST((head)), field); \ | |
| 219 | } while (0) | |
| 220 | ||
| 221 | #define SLIST_SWAP(head1, head2, type) \ | |
| 222 | do { \ | |
| 223 | struct type *swap_first = SLIST_FIRST(head1); \ | |
| 224 | SLIST_FIRST(head1) = SLIST_FIRST(head2); \ | |
| 225 | SLIST_FIRST(head2) = swap_first; \ | |
| 226 | } while (0) | |
| 227 | ||
| 228 | /* | |
| 229 | * Singly-linked Tail queue declarations. | |
| 230 | */ | |
| 231 | #define STAILQ_HEAD(name, type) \ | |
| 232 | struct name { \ | |
| 233 | struct type *stqh_first; /* first element */ \ | |
| 234 | struct type **stqh_last; /* addr of last next element */ \ | |
| 235 | } | |
| 236 | ||
| 237 | #define STAILQ_HEAD_INITIALIZER(head) \ | |
| 238 | { \ | |
| 239 | NULL, &(head).stqh_first \ | |
| 240 | } | |
| 241 | ||
| 242 | #define STAILQ_ENTRY(type) \ | |
| 243 | struct { \ | |
| 244 | struct type *stqe_next; /* next element */ \ | |
| 245 | } | |
| 246 | ||
| 247 | /* | |
| 248 | * Singly-linked Tail queue functions. | |
| 249 | */ | |
| 250 | #define STAILQ_CONCAT(head1, head2) \ | |
| 251 | do { \ | |
| 252 | if (!STAILQ_EMPTY((head2))) { \ | |
| 253 | *(head1)->stqh_last = (head2)->stqh_first; \ | |
| 254 | (head1)->stqh_last = (head2)->stqh_last; \ | |
| 255 | STAILQ_INIT((head2)); \ | |
| 256 | } \ | |
| 257 | } while (0) | |
| 258 | ||
| 259 | #define STAILQ_EMPTY(head) ((head)->stqh_first == NULL) | |
| 260 | ||
| 261 | #define STAILQ_FIRST(head) ((head)->stqh_first) | |
| 262 | ||
| 263 | #define STAILQ_FOREACH(var, head, field) \ | |
| 264 | for ((var) = STAILQ_FIRST((head)); (var); \ | |
| 265 | (var) = STAILQ_NEXT((var), field)) | |
| 266 | ||
| 267 | ||
| 268 | #define STAILQ_FOREACH_SAFE(var, head, field, tvar) \ | |
| 269 | for ((var) = STAILQ_FIRST((head)); \ | |
| 270 | (var) && ((tvar) = STAILQ_NEXT((var), field), 1); (var) = (tvar)) | |
| 271 | ||
| 272 | #define STAILQ_INIT(head) \ | |
| 273 | do { \ | |
| 274 | STAILQ_FIRST((head)) = NULL; \ | |
| 275 | (head)->stqh_last = &STAILQ_FIRST((head)); \ | |
| 276 | } while (0) | |
| 277 | ||
| 278 | #define STAILQ_INSERT_AFTER(head, tqelm, elm, field) \ | |
| 279 | do { \ | |
| 280 | if ((STAILQ_NEXT((elm), field) = STAILQ_NEXT((tqelm), field)) \ | |
| 281 | == NULL) \ | |
| 282 | (head)->stqh_last = &STAILQ_NEXT((elm), field); \ | |
| 283 | STAILQ_NEXT((tqelm), field) = (elm); \ | |
| 284 | } while (0) | |
| 285 | ||
| 286 | #define STAILQ_INSERT_HEAD(head, elm, field) \ | |
| 287 | do { \ | |
| 288 | if ((STAILQ_NEXT((elm), field) = STAILQ_FIRST((head))) \ | |
| 289 | == NULL) \ | |
| 290 | (head)->stqh_last = &STAILQ_NEXT((elm), field); \ | |
| 291 | STAILQ_FIRST((head)) = (elm); \ | |
| 292 | } while (0) | |
| 293 | ||
| 294 | #define STAILQ_INSERT_TAIL(head, elm, field) \ | |
| 295 | do { \ | |
| 296 | STAILQ_NEXT((elm), field) = NULL; \ | |
| 297 | *(head)->stqh_last = (elm); \ | |
| 298 | (head)->stqh_last = &STAILQ_NEXT((elm), field); \ | |
| 299 | } while (0) | |
| 300 | ||
| 301 | #define STAILQ_LAST(head, type, field) \ | |
| 302 | (STAILQ_EMPTY((head)) \ | |
| 303 | ? NULL \ | |
| 304 | : ((struct type *)(void *)((char *)((head)->stqh_last) \ | |
| 996c9314 | 305 | - offsetof(struct type, field)))) |
| cd85bc2e JB |
306 | |
| 307 | #define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next) | |
| 308 | ||
| 309 | #define STAILQ_REMOVE(head, elm, type, field) \ | |
| 310 | do { \ | |
| 311 | QMD_SAVELINK(oldnext, (elm)->field.stqe_next); \ | |
| 312 | if (STAILQ_FIRST((head)) == (elm)) { \ | |
| 313 | STAILQ_REMOVE_HEAD((head), field); \ | |
| 314 | } else { \ | |
| 315 | struct type *curelm = STAILQ_FIRST((head)); \ | |
| 316 | while (STAILQ_NEXT(curelm, field) != (elm)) \ | |
| 317 | curelm = STAILQ_NEXT(curelm, field); \ | |
| 318 | STAILQ_REMOVE_AFTER(head, curelm, field); \ | |
| 319 | } \ | |
| 320 | TRASHIT(*oldnext); \ | |
| 321 | } while (0) | |
| 322 | ||
| 323 | #define STAILQ_REMOVE_AFTER(head, elm, field) \ | |
| 324 | do { \ | |
| 325 | if ((STAILQ_NEXT(elm, field) = \ | |
| 326 | STAILQ_NEXT(STAILQ_NEXT(elm, field), field)) \ | |
| 327 | == NULL) \ | |
| 328 | (head)->stqh_last = &STAILQ_NEXT((elm), field); \ | |
| 329 | } while (0) | |
| 330 | ||
| 331 | #define STAILQ_REMOVE_HEAD(head, field) \ | |
| 332 | do { \ | |
| 333 | if ((STAILQ_FIRST((head)) = \ | |
| 334 | STAILQ_NEXT(STAILQ_FIRST((head)), field)) \ | |
| 335 | == NULL) \ | |
| 336 | (head)->stqh_last = &STAILQ_FIRST((head)); \ | |
| 337 | } while (0) | |
| 338 | ||
| 339 | #define STAILQ_SWAP(head1, head2, type) \ | |
| 340 | do { \ | |
| 341 | struct type *swap_first = STAILQ_FIRST(head1); \ | |
| 342 | struct type **swap_last = (head1)->stqh_last; \ | |
| 343 | STAILQ_FIRST(head1) = STAILQ_FIRST(head2); \ | |
| 344 | (head1)->stqh_last = (head2)->stqh_last; \ | |
| 345 | STAILQ_FIRST(head2) = swap_first; \ | |
| 346 | (head2)->stqh_last = swap_last; \ | |
| 347 | if (STAILQ_EMPTY(head1)) \ | |
| 348 | (head1)->stqh_last = &STAILQ_FIRST(head1); \ | |
| 349 | if (STAILQ_EMPTY(head2)) \ | |
| 350 | (head2)->stqh_last = &STAILQ_FIRST(head2); \ | |
| 351 | } while (0) | |
| 352 | ||
| 353 | ||
| 354 | /* | |
| 355 | * List declarations. | |
| 356 | */ | |
| 357 | #define LIST_HEAD(name, type) \ | |
| 358 | struct name { \ | |
| 359 | struct type *lh_first; /* first element */ \ | |
| 360 | } | |
| 361 | ||
| 362 | #define LIST_HEAD_INITIALIZER(head) \ | |
| 363 | { \ | |
| 364 | NULL \ | |
| 365 | } | |
| 366 | ||
| 367 | #define LIST_ENTRY(type) \ | |
| 368 | struct { \ | |
| 369 | struct type *le_next; /* next element */ \ | |
| 370 | struct type **le_prev; /* address of previous next element */ \ | |
| 371 | } | |
| 372 | ||
| 373 | /* | |
| 374 | * List functions. | |
| 375 | */ | |
| 376 | ||
| 377 | #if (defined(_KERNEL) && defined(INVARIANTS)) | |
| 378 | #define QMD_LIST_CHECK_HEAD(head, field) \ | |
| 379 | do { \ | |
| 380 | if (LIST_FIRST((head)) != NULL \ | |
| 381 | && LIST_FIRST((head))->field.le_prev \ | |
| 382 | != &LIST_FIRST((head))) \ | |
| 383 | panic("Bad list head %p first->prev != head", (head)); \ | |
| 384 | } while (0) | |
| 385 | ||
| 386 | #define QMD_LIST_CHECK_NEXT(elm, field) \ | |
| 387 | do { \ | |
| 388 | if (LIST_NEXT((elm), field) != NULL \ | |
| 389 | && LIST_NEXT((elm), field)->field.le_prev \ | |
| 390 | != &((elm)->field.le_next)) \ | |
| 391 | panic("Bad link elm %p next->prev != elm", (elm)); \ | |
| 392 | } while (0) | |
| 393 | ||
| 394 | #define QMD_LIST_CHECK_PREV(elm, field) \ | |
| 395 | do { \ | |
| 396 | if (*(elm)->field.le_prev != (elm)) \ | |
| 397 | panic("Bad link elm %p prev->next != elm", (elm)); \ | |
| 398 | } while (0) | |
| 399 | #else | |
| 400 | #define QMD_LIST_CHECK_HEAD(head, field) | |
| 401 | #define QMD_LIST_CHECK_NEXT(elm, field) | |
| 402 | #define QMD_LIST_CHECK_PREV(elm, field) | |
| 403 | #endif /* (_KERNEL && INVARIANTS) */ | |
| 404 | ||
| 405 | #define LIST_EMPTY(head) ((head)->lh_first == NULL) | |
| 406 | ||
| 407 | #define LIST_FIRST(head) ((head)->lh_first) | |
| 408 | ||
| 409 | #define LIST_FOREACH(var, head, field) \ | |
| 410 | for ((var) = LIST_FIRST((head)); (var); (var) = LIST_NEXT((var), field)) | |
| 411 | ||
| 412 | #define LIST_FOREACH_SAFE(var, head, field, tvar) \ | |
| 413 | for ((var) = LIST_FIRST((head)); \ | |
| 414 | (var) && ((tvar) = LIST_NEXT((var), field), 1); (var) = (tvar)) | |
| 415 | ||
| 416 | #define LIST_INIT(head) \ | |
| 417 | do { \ | |
| 418 | LIST_FIRST((head)) = NULL; \ | |
| 419 | } while (0) | |
| 420 | ||
| 421 | #define LIST_INSERT_AFTER(listelm, elm, field) \ | |
| 422 | do { \ | |
| 423 | QMD_LIST_CHECK_NEXT(listelm, field); \ | |
| 424 | if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) \ | |
| 425 | != NULL) \ | |
| 426 | LIST_NEXT((listelm), field)->field.le_prev = \ | |
| 427 | &LIST_NEXT((elm), field); \ | |
| 428 | LIST_NEXT((listelm), field) = (elm); \ | |
| 429 | (elm)->field.le_prev = &LIST_NEXT((listelm), field); \ | |
| 430 | } while (0) | |
| 431 | ||
| 432 | #define LIST_INSERT_BEFORE(listelm, elm, field) \ | |
| 433 | do { \ | |
| 434 | QMD_LIST_CHECK_PREV(listelm, field); \ | |
| 435 | (elm)->field.le_prev = (listelm)->field.le_prev; \ | |
| 436 | LIST_NEXT((elm), field) = (listelm); \ | |
| 437 | *(listelm)->field.le_prev = (elm); \ | |
| 438 | (listelm)->field.le_prev = &LIST_NEXT((elm), field); \ | |
| 439 | } while (0) | |
| 440 | ||
| 441 | #define LIST_INSERT_HEAD(head, elm, field) \ | |
| 442 | do { \ | |
| 443 | QMD_LIST_CHECK_HEAD((head), field); \ | |
| 444 | if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL) \ | |
| 445 | LIST_FIRST((head))->field.le_prev = \ | |
| 446 | &LIST_NEXT((elm), field); \ | |
| 447 | LIST_FIRST((head)) = (elm); \ | |
| 448 | (elm)->field.le_prev = &LIST_FIRST((head)); \ | |
| 449 | } while (0) | |
| 450 | ||
| 451 | #define LIST_NEXT(elm, field) ((elm)->field.le_next) | |
| 452 | ||
| 453 | #define LIST_REMOVE(elm, field) \ | |
| 454 | do { \ | |
| 455 | QMD_SAVELINK(oldnext, (elm)->field.le_next); \ | |
| 456 | QMD_SAVELINK(oldprev, (elm)->field.le_prev); \ | |
| 457 | QMD_LIST_CHECK_NEXT(elm, field); \ | |
| 458 | QMD_LIST_CHECK_PREV(elm, field); \ | |
| 459 | if (LIST_NEXT((elm), field) != NULL) \ | |
| 460 | LIST_NEXT((elm), field)->field.le_prev = \ | |
| 461 | (elm)->field.le_prev; \ | |
| 462 | *(elm)->field.le_prev = LIST_NEXT((elm), field); \ | |
| 463 | TRASHIT(*oldnext); \ | |
| 464 | TRASHIT(*oldprev); \ | |
| 465 | } while (0) | |
| 466 | ||
| 467 | #define LIST_SWAP(head1, head2, type, field) \ | |
| 468 | do { \ | |
| 469 | struct type *swap_tmp = LIST_FIRST((head1)); \ | |
| 470 | LIST_FIRST((head1)) = LIST_FIRST((head2)); \ | |
| 471 | LIST_FIRST((head2)) = swap_tmp; \ | |
| 472 | if ((swap_tmp = LIST_FIRST((head1))) != NULL) \ | |
| 473 | swap_tmp->field.le_prev = &LIST_FIRST((head1)); \ | |
| 474 | if ((swap_tmp = LIST_FIRST((head2))) != NULL) \ | |
| 475 | swap_tmp->field.le_prev = &LIST_FIRST((head2)); \ | |
| 476 | } while (0) | |
| 477 | ||
| 478 | /* | |
| 479 | * Tail queue declarations. | |
| 480 | */ | |
| 481 | #define TAILQ_HEAD(name, type) \ | |
| 482 | struct name { \ | |
| 483 | struct type *tqh_first; /* first element */ \ | |
| 484 | struct type **tqh_last; /* addr of last next element */ \ | |
| 485 | TRACEBUF \ | |
| 486 | } | |
| 487 | ||
| 488 | #define TAILQ_HEAD_INITIALIZER(head) \ | |
| 489 | { \ | |
| 490 | NULL, &(head).tqh_first \ | |
| 491 | } | |
| 492 | ||
| 493 | #define TAILQ_ENTRY(type) \ | |
| 494 | struct { \ | |
| 495 | struct type *tqe_next; /* next element */ \ | |
| 496 | struct type **tqe_prev; /* address of previous next element */ \ | |
| 497 | TRACEBUF \ | |
| 498 | } | |
| 499 | ||
| 500 | /* | |
| 501 | * Tail queue functions. | |
| 502 | */ | |
| 503 | #if (defined(_KERNEL) && defined(INVARIANTS)) | |
| 504 | #define QMD_TAILQ_CHECK_HEAD(head, field) \ | |
| 505 | do { \ | |
| 506 | if (!TAILQ_EMPTY(head) \ | |
| 507 | && TAILQ_FIRST((head))->field.tqe_prev \ | |
| 508 | != &TAILQ_FIRST((head))) \ | |
| 509 | panic("Bad tailq head %p first->prev != head", \ | |
| 510 | (head)); \ | |
| 511 | } while (0) | |
| 512 | ||
| 513 | #define QMD_TAILQ_CHECK_TAIL(head, field) \ | |
| 514 | do { \ | |
| 515 | if (*(head)->tqh_last != NULL) \ | |
| 516 | panic("Bad tailq NEXT(%p->tqh_last) != NULL", (head)); \ | |
| 517 | } while (0) | |
| 518 | ||
| 519 | #define QMD_TAILQ_CHECK_NEXT(elm, field) \ | |
| 520 | do { \ | |
| 521 | if (TAILQ_NEXT((elm), field) != NULL \ | |
| 522 | && TAILQ_NEXT((elm), field)->field.tqe_prev \ | |
| 523 | != &((elm)->field.tqe_next)) \ | |
| 524 | panic("Bad link elm %p next->prev != elm", (elm)); \ | |
| 525 | } while (0) | |
| 526 | ||
| 527 | #define QMD_TAILQ_CHECK_PREV(elm, field) \ | |
| 528 | do { \ | |
| 529 | if (*(elm)->field.tqe_prev != (elm)) \ | |
| 530 | panic("Bad link elm %p prev->next != elm", (elm)); \ | |
| 531 | } while (0) | |
| 532 | #else | |
| 533 | #define QMD_TAILQ_CHECK_HEAD(head, field) | |
| 534 | #define QMD_TAILQ_CHECK_TAIL(head, headname) | |
| 535 | #define QMD_TAILQ_CHECK_NEXT(elm, field) | |
| 536 | #define QMD_TAILQ_CHECK_PREV(elm, field) | |
| 537 | #endif /* (_KERNEL && INVARIANTS) */ | |
| 538 | ||
| 539 | #define TAILQ_CONCAT(head1, head2, field) \ | |
| 540 | do { \ | |
| 541 | if (!TAILQ_EMPTY(head2)) { \ | |
| 542 | *(head1)->tqh_last = (head2)->tqh_first; \ | |
| 543 | (head2)->tqh_first->field.tqe_prev = \ | |
| 544 | (head1)->tqh_last; \ | |
| 545 | (head1)->tqh_last = (head2)->tqh_last; \ | |
| 546 | TAILQ_INIT((head2)); \ | |
| 547 | QMD_TRACE_HEAD(head1); \ | |
| 548 | QMD_TRACE_HEAD(head2); \ | |
| 549 | } \ | |
| 550 | } while (0) | |
| 551 | ||
| 552 | #define TAILQ_EMPTY(head) ((head)->tqh_first == NULL) | |
| 553 | ||
| 554 | #define TAILQ_FIRST(head) ((head)->tqh_first) | |
| 555 | ||
| 556 | #define TAILQ_FOREACH(var, head, field) \ | |
| 557 | for ((var) = TAILQ_FIRST((head)); (var); \ | |
| 558 | (var) = TAILQ_NEXT((var), field)) | |
| 559 | ||
| 560 | #define TAILQ_FOREACH_SAFE(var, head, field, tvar) \ | |
| 561 | for ((var) = TAILQ_FIRST((head)); \ | |
| 562 | (var) && ((tvar) = TAILQ_NEXT((var), field), 1); (var) = (tvar)) | |
| 563 | ||
| 564 | #define TAILQ_FOREACH_REVERSE(var, head, headname, field) \ | |
| 565 | for ((var) = TAILQ_LAST((head), headname); (var); \ | |
| 566 | (var) = TAILQ_PREV((var), headname, field)) | |
| 567 | ||
| 568 | #define TAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, tvar) \ | |
| 569 | for ((var) = TAILQ_LAST((head), headname); \ | |
| 570 | (var) && ((tvar) = TAILQ_PREV((var), headname, field), 1); \ | |
| 571 | (var) = (tvar)) | |
| 572 | ||
| 573 | #define TAILQ_INIT(head) \ | |
| 574 | do { \ | |
| 575 | TAILQ_FIRST((head)) = NULL; \ | |
| 576 | (head)->tqh_last = &TAILQ_FIRST((head)); \ | |
| 577 | QMD_TRACE_HEAD(head); \ | |
| 578 | } while (0) | |
| 579 | ||
| 580 | #define TAILQ_INSERT_AFTER(head, listelm, elm, field) \ | |
| 581 | do { \ | |
| 582 | QMD_TAILQ_CHECK_NEXT(listelm, field); \ | |
| 583 | if ((TAILQ_NEXT((elm), field) = TAILQ_NEXT((listelm), field)) \ | |
| 584 | != NULL) \ | |
| 585 | TAILQ_NEXT((elm), field)->field.tqe_prev = \ | |
| 586 | &TAILQ_NEXT((elm), field); \ | |
| 587 | else { \ | |
| 588 | (head)->tqh_last = &TAILQ_NEXT((elm), field); \ | |
| 589 | QMD_TRACE_HEAD(head); \ | |
| 590 | } \ | |
| 591 | TAILQ_NEXT((listelm), field) = (elm); \ | |
| 592 | (elm)->field.tqe_prev = &TAILQ_NEXT((listelm), field); \ | |
| 593 | QMD_TRACE_ELEM(&(elm)->field); \ | |
| 594 | QMD_TRACE_ELEM(&listelm->field); \ | |
| 595 | } while (0) | |
| 596 | ||
| 597 | #define TAILQ_INSERT_BEFORE(listelm, elm, field) \ | |
| 598 | do { \ | |
| 599 | QMD_TAILQ_CHECK_PREV(listelm, field); \ | |
| 600 | (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \ | |
| 601 | TAILQ_NEXT((elm), field) = (listelm); \ | |
| 602 | *(listelm)->field.tqe_prev = (elm); \ | |
| 603 | (listelm)->field.tqe_prev = &TAILQ_NEXT((elm), field); \ | |
| 604 | QMD_TRACE_ELEM(&(elm)->field); \ | |
| 605 | QMD_TRACE_ELEM(&listelm->field); \ | |
| 606 | } while (0) | |
| 607 | ||
| 608 | #define TAILQ_INSERT_HEAD(head, elm, field) \ | |
| 609 | do { \ | |
| 610 | QMD_TAILQ_CHECK_HEAD(head, field); \ | |
| 611 | if ((TAILQ_NEXT((elm), field) = TAILQ_FIRST((head))) != NULL) \ | |
| 612 | TAILQ_FIRST((head))->field.tqe_prev = \ | |
| 613 | &TAILQ_NEXT((elm), field); \ | |
| 614 | else \ | |
| 615 | (head)->tqh_last = &TAILQ_NEXT((elm), field); \ | |
| 616 | TAILQ_FIRST((head)) = (elm); \ | |
| 617 | (elm)->field.tqe_prev = &TAILQ_FIRST((head)); \ | |
| 618 | QMD_TRACE_HEAD(head); \ | |
| 619 | QMD_TRACE_ELEM(&(elm)->field); \ | |
| 620 | } while (0) | |
| 621 | ||
| 622 | #define TAILQ_INSERT_TAIL(head, elm, field) \ | |
| 623 | do { \ | |
| 624 | QMD_TAILQ_CHECK_TAIL(head, field); \ | |
| 625 | TAILQ_NEXT((elm), field) = NULL; \ | |
| 626 | (elm)->field.tqe_prev = (head)->tqh_last; \ | |
| 627 | *(head)->tqh_last = (elm); \ | |
| 628 | (head)->tqh_last = &TAILQ_NEXT((elm), field); \ | |
| 629 | QMD_TRACE_HEAD(head); \ | |
| 630 | QMD_TRACE_ELEM(&(elm)->field); \ | |
| 631 | } while (0) | |
| 632 | ||
| 633 | #define TAILQ_LAST(head, headname) \ | |
| 634 | (*(((struct headname *)((head)->tqh_last))->tqh_last)) | |
| 635 | ||
| 636 | #define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next) | |
| 637 | ||
| 638 | #define TAILQ_PREV(elm, headname, field) \ | |
| 639 | (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last)) | |
| 640 | ||
| 641 | #define TAILQ_REMOVE(head, elm, field) \ | |
| 642 | do { \ | |
| 643 | QMD_SAVELINK(oldnext, (elm)->field.tqe_next); \ | |
| 644 | QMD_SAVELINK(oldprev, (elm)->field.tqe_prev); \ | |
| 645 | QMD_TAILQ_CHECK_NEXT(elm, field); \ | |
| 646 | QMD_TAILQ_CHECK_PREV(elm, field); \ | |
| 647 | if ((TAILQ_NEXT((elm), field)) != NULL) \ | |
| 648 | TAILQ_NEXT((elm), field)->field.tqe_prev = \ | |
| 649 | (elm)->field.tqe_prev; \ | |
| 650 | else { \ | |
| 651 | (head)->tqh_last = (elm)->field.tqe_prev; \ | |
| 652 | QMD_TRACE_HEAD(head); \ | |
| 653 | } \ | |
| 654 | *(elm)->field.tqe_prev = TAILQ_NEXT((elm), field); \ | |
| 655 | TRASHIT(*oldnext); \ | |
| 656 | TRASHIT(*oldprev); \ | |
| 657 | QMD_TRACE_ELEM(&(elm)->field); \ | |
| 658 | } while (0) | |
| 659 | ||
| 660 | #define TAILQ_SWAP(head1, head2, type, field) \ | |
| 661 | do { \ | |
| 662 | struct type *swap_first = (head1)->tqh_first; \ | |
| 663 | struct type **swap_last = (head1)->tqh_last; \ | |
| 664 | (head1)->tqh_first = (head2)->tqh_first; \ | |
| 665 | (head1)->tqh_last = (head2)->tqh_last; \ | |
| 666 | (head2)->tqh_first = swap_first; \ | |
| 667 | (head2)->tqh_last = swap_last; \ | |
| 668 | if ((swap_first = (head1)->tqh_first) != NULL) \ | |
| 669 | swap_first->field.tqe_prev = &(head1)->tqh_first; \ | |
| 670 | else \ | |
| 671 | (head1)->tqh_last = &(head1)->tqh_first; \ | |
| 672 | if ((swap_first = (head2)->tqh_first) != NULL) \ | |
| 673 | swap_first->field.tqe_prev = &(head2)->tqh_first; \ | |
| 674 | else \ | |
| 675 | (head2)->tqh_last = &(head2)->tqh_first; \ | |
| 676 | } while (0) | |
| 677 | ||
| 678 | #endif /* !_SYS_QUEUE_H_ */ |