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 */ 30 31 #ifndef _USER_QUEUE_H_ 32 #define _USER_QUEUE_H_ 33 34 #if !defined (__Userspace_os_Windows) 35 #include <sys/cdefs.h> 36 #endif 37 /* 38 * This file defines four types of data structures: singly-linked lists, 39 * singly-linked tail queues, lists and tail queues. 40 * 41 * A singly-linked list is headed by a single forward pointer. The elements 42 * are singly linked for minimum space and pointer manipulation overhead at 43 * the expense of O(n) removal for arbitrary elements. New elements can be 44 * added to the list after an existing element or at the head of the list. 45 * Elements being removed from the head of the list should use the explicit 46 * macro for this purpose for optimum efficiency. A singly-linked list may 47 * only be traversed in the forward direction. Singly-linked lists are ideal 48 * for applications with large datasets and few or no removals or for 49 * implementing a LIFO queue. 50 * 51 * A singly-linked tail queue is headed by a pair of pointers, one to the 52 * head of the list and the other to the tail of the list. The elements are 53 * singly linked for minimum space and pointer manipulation overhead at the 54 * expense of O(n) removal for arbitrary elements. New elements can be added 55 * to the list after an existing element, at the head of the list, or at the 56 * end of the list. Elements being removed from the head of the tail queue 57 * should use the explicit macro for this purpose for optimum efficiency. 58 * A singly-linked tail queue may only be traversed in the forward direction. 59 * Singly-linked tail queues are ideal for applications with large datasets 60 * and few or no removals or for implementing a FIFO queue. 61 * 62 * A list is headed by a single forward pointer (or an array of forward 63 * pointers for a hash table header). The elements are doubly linked 64 * so that an arbitrary element can be removed without a need to 65 * traverse the list. New elements can be added to the list before 66 * or after an existing element or at the head of the list. A list 67 * may only be traversed in the forward direction. 68 * 69 * A tail queue is headed by a pair of pointers, one to the head of the 70 * list and the other to the tail of the list. The elements are doubly 71 * linked so that an arbitrary element can be removed without a need to 72 * traverse the list. New elements can be added to the list before or 73 * after an existing element, at the head of the list, or at the end of 74 * the list. A tail queue may be traversed in either direction. 75 * 76 * For details on the use of these macros, see the queue(3) manual page. 77 * 78 * 79 * SLIST LIST STAILQ TAILQ 80 * _HEAD + + + + 81 * _HEAD_INITIALIZER + + + + 82 * _ENTRY + + + + 83 * _INIT + + + + 84 * _EMPTY + + + + 85 * _FIRST + + + + 86 * _NEXT + + + + 87 * _PREV - - - + 88 * _LAST - - + + 89 * _FOREACH + + + + 90 * _FOREACH_SAFE + + + + 91 * _FOREACH_REVERSE - - - + 92 * _FOREACH_REVERSE_SAFE - - - + 93 * _INSERT_HEAD + + + + 94 * _INSERT_BEFORE - + - + 95 * _INSERT_AFTER + + + + 96 * _INSERT_TAIL - - + + 97 * _CONCAT - - + + 98 * _REMOVE_AFTER + - + - 99 * _REMOVE_HEAD + - + - 100 * _REMOVE + + + + 101 * _SWAP + + + + 102 * 103 */ 104 #ifdef QUEUE_MACRO_DEBUG 105 /* Store the last 2 places the queue element or head was altered */ 106 struct qm_trace { 107 char * lastfile; 108 int lastline; 109 char * prevfile; 110 int prevline; 111 }; 112 113 #define TRACEBUF struct qm_trace trace; 114 #define TRASHIT(x) do {(x) = (void *)-1;} while (0) 115 #define QMD_SAVELINK(name, link) void **name = (void *)&(link) 116 117 #define QMD_TRACE_HEAD(head) 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) do { \ 125 (elem)->trace.prevline = (elem)->trace.lastline; \ 126 (elem)->trace.prevfile = (elem)->trace.lastfile; \ 127 (elem)->trace.lastline = __LINE__; \ 128 (elem)->trace.lastfile = __FILE__; \ 129 } while (0) 130 131 #else 132 #define QMD_TRACE_ELEM(elem) 133 #define QMD_TRACE_HEAD(head) 134 #define QMD_SAVELINK(name, link) 135 #define TRACEBUF 136 #define TRASHIT(x) 137 #endif /* QUEUE_MACRO_DEBUG */ 138 139 /* 140 * Singly-linked List declarations. 141 */ 142 #define SLIST_HEAD(name, type) \ 143 struct name { \ 144 struct type *slh_first; /* first element */ \ 145 } 146 147 #define SLIST_HEAD_INITIALIZER(head) \ 148 { NULL } 149 150 #if defined (__Userspace_os_Windows) 151 #if defined (SLIST_ENTRY) 152 #undef SLIST_ENTRY 153 #endif 154 #endif 155 156 #define SLIST_ENTRY(type) \ 157 struct { \ 158 struct type *sle_next; /* next element */ \ 159 } 160 161 /* 162 * Singly-linked List functions. 163 */ 164 #define SLIST_EMPTY(head) ((head)->slh_first == NULL) 165 166 #define SLIST_FIRST(head) ((head)->slh_first) 167 168 #define SLIST_FOREACH(var, head, field) \ 169 for ((var) = SLIST_FIRST((head)); \ 170 (var); \ 171 (var) = SLIST_NEXT((var), field)) 172 173 #define SLIST_FOREACH_SAFE(var, head, field, tvar) \ 174 for ((var) = SLIST_FIRST((head)); \ 175 (var) && ((tvar) = SLIST_NEXT((var), field), 1); \ 176 (var) = (tvar)) 177 178 #define SLIST_FOREACH_PREVPTR(var, varp, head, field) \ 179 for ((varp) = &SLIST_FIRST((head)); \ 180 ((var) = *(varp)) != NULL; \ 181 (varp) = &SLIST_NEXT((var), field)) 182 183 #define SLIST_INIT(head) do { \ 184 SLIST_FIRST((head)) = NULL; \ 185 } while (0) 186 187 #define SLIST_INSERT_AFTER(slistelm, elm, field) do { \ 188 SLIST_NEXT((elm), field) = SLIST_NEXT((slistelm), field); \ 189 SLIST_NEXT((slistelm), field) = (elm); \ 190 } while (0) 191 192 #define SLIST_INSERT_HEAD(head, elm, field) do { \ 193 SLIST_NEXT((elm), field) = SLIST_FIRST((head)); \ 194 SLIST_FIRST((head)) = (elm); \ 195 } while (0) 196 197 #define SLIST_NEXT(elm, field) ((elm)->field.sle_next) 198 199 #define SLIST_REMOVE(head, elm, type, field) do { \ 200 QMD_SAVELINK(oldnext, (elm)->field.sle_next); \ 201 if (SLIST_FIRST((head)) == (elm)) { \ 202 SLIST_REMOVE_HEAD((head), field); \ 203 } \ 204 else { \ 205 struct type *curelm = SLIST_FIRST((head)); \ 206 while (SLIST_NEXT(curelm, field) != (elm)) \ 207 curelm = SLIST_NEXT(curelm, field); \ 208 SLIST_REMOVE_AFTER(curelm, field); \ 209 } \ 210 TRASHIT(*oldnext); \ 211 } while (0) 212 213 #define SLIST_REMOVE_AFTER(elm, field) do { \ 214 SLIST_NEXT(elm, field) = \ 215 SLIST_NEXT(SLIST_NEXT(elm, field), field); \ 216 } while (0) 217 218 #define SLIST_REMOVE_HEAD(head, field) do { \ 219 SLIST_FIRST((head)) = SLIST_NEXT(SLIST_FIRST((head)), field); \ 220 } while (0) 221 222 #define SLIST_SWAP(head1, head2, type) 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 { NULL, &(head).stqh_first } 239 240 #define STAILQ_ENTRY(type) \ 241 struct { \ 242 struct type *stqe_next; /* next element */ \ 243 } 244 245 /* 246 * Singly-linked Tail queue functions. 247 */ 248 #define STAILQ_CONCAT(head1, head2) do { \ 249 if (!STAILQ_EMPTY((head2))) { \ 250 *(head1)->stqh_last = (head2)->stqh_first; \ 251 (head1)->stqh_last = (head2)->stqh_last; \ 252 STAILQ_INIT((head2)); \ 253 } \ 254 } while (0) 255 256 #define STAILQ_EMPTY(head) ((head)->stqh_first == NULL) 257 258 #define STAILQ_FIRST(head) ((head)->stqh_first) 259 260 #define STAILQ_FOREACH(var, head, field) \ 261 for((var) = STAILQ_FIRST((head)); \ 262 (var); \ 263 (var) = STAILQ_NEXT((var), field)) 264 265 266 #define STAILQ_FOREACH_SAFE(var, head, field, tvar) \ 267 for ((var) = STAILQ_FIRST((head)); \ 268 (var) && ((tvar) = STAILQ_NEXT((var), field), 1); \ 269 (var) = (tvar)) 270 271 #define STAILQ_INIT(head) do { \ 272 STAILQ_FIRST((head)) = NULL; \ 273 (head)->stqh_last = &STAILQ_FIRST((head)); \ 274 } while (0) 275 276 #define STAILQ_INSERT_AFTER(head, tqelm, elm, field) do { \ 277 if ((STAILQ_NEXT((elm), field) = STAILQ_NEXT((tqelm), field)) == NULL)\ 278 (head)->stqh_last = &STAILQ_NEXT((elm), field); \ 279 STAILQ_NEXT((tqelm), field) = (elm); \ 280 } while (0) 281 282 #define STAILQ_INSERT_HEAD(head, elm, field) do { \ 283 if ((STAILQ_NEXT((elm), field) = STAILQ_FIRST((head))) == NULL) \ 284 (head)->stqh_last = &STAILQ_NEXT((elm), field); \ 285 STAILQ_FIRST((head)) = (elm); \ 286 } while (0) 287 288 #define STAILQ_INSERT_TAIL(head, elm, field) do { \ 289 STAILQ_NEXT((elm), field) = NULL; \ 290 *(head)->stqh_last = (elm); \ 291 (head)->stqh_last = &STAILQ_NEXT((elm), field); \ 292 } while (0) 293 294 #define STAILQ_LAST(head, type, field) \ 295 (STAILQ_EMPTY((head)) ? \ 296 NULL : \ 297 ((struct type *)(void *) \ 298 ((char *)((head)->stqh_last) - __offsetof(struct type, field)))) 299 300 #define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next) 301 302 #define STAILQ_REMOVE(head, elm, type, field) do { \ 303 QMD_SAVELINK(oldnext, (elm)->field.stqe_next); \ 304 if (STAILQ_FIRST((head)) == (elm)) { \ 305 STAILQ_REMOVE_HEAD((head), field); \ 306 } \ 307 else { \ 308 struct type *curelm = STAILQ_FIRST((head)); \ 309 while (STAILQ_NEXT(curelm, field) != (elm)) \ 310 curelm = STAILQ_NEXT(curelm, field); \ 311 STAILQ_REMOVE_AFTER(head, curelm, field); \ 312 } \ 313 TRASHIT(*oldnext); \ 314 } while (0) 315 316 #define STAILQ_REMOVE_AFTER(head, elm, field) do { \ 317 if ((STAILQ_NEXT(elm, field) = \ 318 STAILQ_NEXT(STAILQ_NEXT(elm, field), field)) == NULL) \ 319 (head)->stqh_last = &STAILQ_NEXT((elm), field); \ 320 } while (0) 321 322 #define STAILQ_REMOVE_HEAD(head, field) do { \ 323 if ((STAILQ_FIRST((head)) = \ 324 STAILQ_NEXT(STAILQ_FIRST((head)), field)) == NULL) \ 325 (head)->stqh_last = &STAILQ_FIRST((head)); \ 326 } while (0) 327 328 #define STAILQ_SWAP(head1, head2, type) do { \ 329 struct type *swap_first = STAILQ_FIRST(head1); \ 330 struct type **swap_last = (head1)->stqh_last; \ 331 STAILQ_FIRST(head1) = STAILQ_FIRST(head2); \ 332 (head1)->stqh_last = (head2)->stqh_last; \ 333 STAILQ_FIRST(head2) = swap_first; \ 334 (head2)->stqh_last = swap_last; \ 335 if (STAILQ_EMPTY(head1)) \ 336 (head1)->stqh_last = &STAILQ_FIRST(head1); \ 337 if (STAILQ_EMPTY(head2)) \ 338 (head2)->stqh_last = &STAILQ_FIRST(head2); \ 339 } while (0) 340 341 342 /* 343 * List declarations. 344 */ 345 #define LIST_HEAD(name, type) \ 346 struct name { \ 347 struct type *lh_first; /* first element */ \ 348 } 349 350 #define LIST_HEAD_INITIALIZER(head) \ 351 { NULL } 352 353 #define LIST_ENTRY(type) \ 354 struct { \ 355 struct type *le_next; /* next element */ \ 356 struct type **le_prev; /* address of previous next element */ \ 357 } 358 359 /* 360 * List functions. 361 */ 362 363 #if defined(INVARIANTS) 364 #define QMD_LIST_CHECK_HEAD(head, field) do { \ 365 if (LIST_FIRST((head)) != NULL && \ 366 LIST_FIRST((head))->field.le_prev != \ 367 &LIST_FIRST((head))) \ 368 panic("Bad list head %p first->prev != head", (void *)(head)); \ 369 } while (0) 370 371 #define QMD_LIST_CHECK_NEXT(elm, field) do { \ 372 if (LIST_NEXT((elm), field) != NULL && \ 373 LIST_NEXT((elm), field)->field.le_prev != \ 374 &((elm)->field.le_next)) \ 375 panic("Bad link elm %p next->prev != elm", (void *)(elm)); \ 376 } while (0) 377 378 #define QMD_LIST_CHECK_PREV(elm, field) do { \ 379 if (*(elm)->field.le_prev != (elm)) \ 380 panic("Bad link elm %p prev->next != elm", (void *)(elm)); \ 381 } while (0) 382 #else 383 #define QMD_LIST_CHECK_HEAD(head, field) 384 #define QMD_LIST_CHECK_NEXT(elm, field) 385 #define QMD_LIST_CHECK_PREV(elm, field) 386 #endif /* (INVARIANTS) */ 387 388 #define LIST_EMPTY(head) ((head)->lh_first == NULL) 389 390 #define LIST_FIRST(head) ((head)->lh_first) 391 392 #define LIST_FOREACH(var, head, field) \ 393 for ((var) = LIST_FIRST((head)); \ 394 (var); \ 395 (var) = LIST_NEXT((var), field)) 396 397 #define LIST_FOREACH_SAFE(var, head, field, tvar) \ 398 for ((var) = LIST_FIRST((head)); \ 399 (var) && ((tvar) = LIST_NEXT((var), field), 1); \ 400 (var) = (tvar)) 401 402 #define LIST_INIT(head) do { \ 403 LIST_FIRST((head)) = NULL; \ 404 } while (0) 405 406 #define LIST_INSERT_AFTER(listelm, elm, field) do { \ 407 QMD_LIST_CHECK_NEXT(listelm, field); \ 408 if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)\ 409 LIST_NEXT((listelm), field)->field.le_prev = \ 410 &LIST_NEXT((elm), field); \ 411 LIST_NEXT((listelm), field) = (elm); \ 412 (elm)->field.le_prev = &LIST_NEXT((listelm), field); \ 413 } while (0) 414 415 #define LIST_INSERT_BEFORE(listelm, elm, field) do { \ 416 QMD_LIST_CHECK_PREV(listelm, field); \ 417 (elm)->field.le_prev = (listelm)->field.le_prev; \ 418 LIST_NEXT((elm), field) = (listelm); \ 419 *(listelm)->field.le_prev = (elm); \ 420 (listelm)->field.le_prev = &LIST_NEXT((elm), field); \ 421 } while (0) 422 423 #define LIST_INSERT_HEAD(head, elm, field) do { \ 424 QMD_LIST_CHECK_HEAD((head), field); \ 425 if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL) \ 426 LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);\ 427 LIST_FIRST((head)) = (elm); \ 428 (elm)->field.le_prev = &LIST_FIRST((head)); \ 429 } while (0) 430 431 #define LIST_NEXT(elm, field) ((elm)->field.le_next) 432 433 #define LIST_REMOVE(elm, field) do { \ 434 QMD_SAVELINK(oldnext, (elm)->field.le_next); \ 435 QMD_SAVELINK(oldprev, (elm)->field.le_prev); \ 436 QMD_LIST_CHECK_NEXT(elm, field); \ 437 QMD_LIST_CHECK_PREV(elm, field); \ 438 if (LIST_NEXT((elm), field) != NULL) \ 439 LIST_NEXT((elm), field)->field.le_prev = \ 440 (elm)->field.le_prev; \ 441 *(elm)->field.le_prev = LIST_NEXT((elm), field); \ 442 TRASHIT(*oldnext); \ 443 TRASHIT(*oldprev); \ 444 } while (0) 445 446 #define LIST_SWAP(head1, head2, type, field) do { \ 447 struct type *swap_tmp = LIST_FIRST((head1)); \ 448 LIST_FIRST((head1)) = LIST_FIRST((head2)); \ 449 LIST_FIRST((head2)) = swap_tmp; \ 450 if ((swap_tmp = LIST_FIRST((head1))) != NULL) \ 451 swap_tmp->field.le_prev = &LIST_FIRST((head1)); \ 452 if ((swap_tmp = LIST_FIRST((head2))) != NULL) \ 453 swap_tmp->field.le_prev = &LIST_FIRST((head2)); \ 454 } while (0) 455 456 /* 457 * Tail queue declarations. 458 */ 459 #define TAILQ_HEAD(name, type) \ 460 struct name { \ 461 struct type *tqh_first; /* first element */ \ 462 struct type **tqh_last; /* addr of last next element */ \ 463 TRACEBUF \ 464 } 465 466 #define TAILQ_HEAD_INITIALIZER(head) \ 467 { NULL, &(head).tqh_first } 468 469 #define TAILQ_ENTRY(type) \ 470 struct { \ 471 struct type *tqe_next; /* next element */ \ 472 struct type **tqe_prev; /* address of previous next element */ \ 473 TRACEBUF \ 474 } 475 476 /* 477 * Tail queue functions. 478 */ 479 #if defined(INVARIANTS) 480 #define QMD_TAILQ_CHECK_HEAD(head, field) do { \ 481 if (!TAILQ_EMPTY(head) && \ 482 TAILQ_FIRST((head))->field.tqe_prev != \ 483 &TAILQ_FIRST((head))) \ 484 panic("Bad tailq head %p first->prev != head", (void *)(head)); \ 485 } while (0) 486 487 #define QMD_TAILQ_CHECK_TAIL(head, field) do { \ 488 if (*(head)->tqh_last != NULL) \ 489 panic("Bad tailq NEXT(%p->tqh_last) != NULL", (void *)(head)); \ 490 } while (0) 491 492 #define QMD_TAILQ_CHECK_NEXT(elm, field) do { \ 493 if (TAILQ_NEXT((elm), field) != NULL && \ 494 TAILQ_NEXT((elm), field)->field.tqe_prev != \ 495 &((elm)->field.tqe_next)) \ 496 panic("Bad link elm %p next->prev != elm", (void *)(elm)); \ 497 } while (0) 498 499 #define QMD_TAILQ_CHECK_PREV(elm, field) do { \ 500 if (*(elm)->field.tqe_prev != (elm)) \ 501 panic("Bad link elm %p prev->next != elm", (void *)(elm)); \ 502 } while (0) 503 #else 504 #define QMD_TAILQ_CHECK_HEAD(head, field) 505 #define QMD_TAILQ_CHECK_TAIL(head, headname) 506 #define QMD_TAILQ_CHECK_NEXT(elm, field) 507 #define QMD_TAILQ_CHECK_PREV(elm, field) 508 #endif /* (INVARIANTS) */ 509 510 #define TAILQ_CONCAT(head1, head2, field) do { \ 511 if (!TAILQ_EMPTY(head2)) { \ 512 *(head1)->tqh_last = (head2)->tqh_first; \ 513 (head2)->tqh_first->field.tqe_prev = (head1)->tqh_last; \ 514 (head1)->tqh_last = (head2)->tqh_last; \ 515 TAILQ_INIT((head2)); \ 516 QMD_TRACE_HEAD(head1); \ 517 QMD_TRACE_HEAD(head2); \ 518 } \ 519 } while (0) 520 521 #define TAILQ_EMPTY(head) ((head)->tqh_first == NULL) 522 523 #define TAILQ_FIRST(head) ((head)->tqh_first) 524 525 #define TAILQ_FOREACH(var, head, field) \ 526 for ((var) = TAILQ_FIRST((head)); \ 527 (var); \ 528 (var) = TAILQ_NEXT((var), field)) 529 530 #define TAILQ_FOREACH_SAFE(var, head, field, tvar) \ 531 for ((var) = TAILQ_FIRST((head)); \ 532 (var) && ((tvar) = TAILQ_NEXT((var), field), 1); \ 533 (var) = (tvar)) 534 535 #define TAILQ_FOREACH_REVERSE(var, head, headname, field) \ 536 for ((var) = TAILQ_LAST((head), headname); \ 537 (var); \ 538 (var) = TAILQ_PREV((var), headname, field)) 539 540 #define TAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, tvar) \ 541 for ((var) = TAILQ_LAST((head), headname); \ 542 (var) && ((tvar) = TAILQ_PREV((var), headname, field), 1); \ 543 (var) = (tvar)) 544 545 #define TAILQ_INIT(head) do { \ 546 TAILQ_FIRST((head)) = NULL; \ 547 (head)->tqh_last = &TAILQ_FIRST((head)); \ 548 QMD_TRACE_HEAD(head); \ 549 } while (0) 550 551 #define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \ 552 QMD_TAILQ_CHECK_NEXT(listelm, field); \ 553 if ((TAILQ_NEXT((elm), field) = TAILQ_NEXT((listelm), field)) != NULL)\ 554 TAILQ_NEXT((elm), field)->field.tqe_prev = \ 555 &TAILQ_NEXT((elm), field); \ 556 else { \ 557 (head)->tqh_last = &TAILQ_NEXT((elm), field); \ 558 QMD_TRACE_HEAD(head); \ 559 } \ 560 TAILQ_NEXT((listelm), field) = (elm); \ 561 (elm)->field.tqe_prev = &TAILQ_NEXT((listelm), field); \ 562 QMD_TRACE_ELEM(&(elm)->field); \ 563 QMD_TRACE_ELEM(&listelm->field); \ 564 } while (0) 565 566 #define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \ 567 QMD_TAILQ_CHECK_PREV(listelm, field); \ 568 (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \ 569 TAILQ_NEXT((elm), field) = (listelm); \ 570 *(listelm)->field.tqe_prev = (elm); \ 571 (listelm)->field.tqe_prev = &TAILQ_NEXT((elm), field); \ 572 QMD_TRACE_ELEM(&(elm)->field); \ 573 QMD_TRACE_ELEM(&listelm->field); \ 574 } while (0) 575 576 #define TAILQ_INSERT_HEAD(head, elm, field) do { \ 577 QMD_TAILQ_CHECK_HEAD(head, field); \ 578 if ((TAILQ_NEXT((elm), field) = TAILQ_FIRST((head))) != NULL) \ 579 TAILQ_FIRST((head))->field.tqe_prev = \ 580 &TAILQ_NEXT((elm), field); \ 581 else \ 582 (head)->tqh_last = &TAILQ_NEXT((elm), field); \ 583 TAILQ_FIRST((head)) = (elm); \ 584 (elm)->field.tqe_prev = &TAILQ_FIRST((head)); \ 585 QMD_TRACE_HEAD(head); \ 586 QMD_TRACE_ELEM(&(elm)->field); \ 587 } while (0) 588 589 #define TAILQ_INSERT_TAIL(head, elm, field) do { \ 590 QMD_TAILQ_CHECK_TAIL(head, field); \ 591 TAILQ_NEXT((elm), field) = NULL; \ 592 (elm)->field.tqe_prev = (head)->tqh_last; \ 593 *(head)->tqh_last = (elm); \ 594 (head)->tqh_last = &TAILQ_NEXT((elm), field); \ 595 QMD_TRACE_HEAD(head); \ 596 QMD_TRACE_ELEM(&(elm)->field); \ 597 } while (0) 598 599 #define TAILQ_LAST(head, headname) \ 600 (*(((struct headname *)((head)->tqh_last))->tqh_last)) 601 602 #define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next) 603 604 #define TAILQ_PREV(elm, headname, field) \ 605 (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last)) 606 607 #define TAILQ_REMOVE(head, elm, field) do { \ 608 QMD_SAVELINK(oldnext, (elm)->field.tqe_next); \ 609 QMD_SAVELINK(oldprev, (elm)->field.tqe_prev); \ 610 QMD_TAILQ_CHECK_NEXT(elm, field); \ 611 QMD_TAILQ_CHECK_PREV(elm, field); \ 612 if ((TAILQ_NEXT((elm), field)) != NULL) \ 613 TAILQ_NEXT((elm), field)->field.tqe_prev = \ 614 (elm)->field.tqe_prev; \ 615 else { \ 616 (head)->tqh_last = (elm)->field.tqe_prev; \ 617 QMD_TRACE_HEAD(head); \ 618 } \ 619 *(elm)->field.tqe_prev = TAILQ_NEXT((elm), field); \ 620 TRASHIT(*oldnext); \ 621 TRASHIT(*oldprev); \ 622 QMD_TRACE_ELEM(&(elm)->field); \ 623 } while (0) 624 625 #define TAILQ_SWAP(head1, head2, type, field) do { \ 626 struct type *swap_first = (head1)->tqh_first; \ 627 struct type **swap_last = (head1)->tqh_last; \ 628 (head1)->tqh_first = (head2)->tqh_first; \ 629 (head1)->tqh_last = (head2)->tqh_last; \ 630 (head2)->tqh_first = swap_first; \ 631 (head2)->tqh_last = swap_last; \ 632 if ((swap_first = (head1)->tqh_first) != NULL) \ 633 swap_first->field.tqe_prev = &(head1)->tqh_first; \ 634 else \ 635 (head1)->tqh_last = &(head1)->tqh_first; \ 636 if ((swap_first = (head2)->tqh_first) != NULL) \ 637 swap_first->field.tqe_prev = &(head2)->tqh_first; \ 638 else \ 639 (head2)->tqh_last = &(head2)->tqh_first; \ 640 } while (0) 641 642 #endif /* !_SYS_QUEUE_H_ */ 643
