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1656cbed | 1 | /* $OpenBSD: queue.h,v 1.22 2001/06/23 04:39:35 angelos Exp $ */ |
bf5f69f7 | 2 | /* $NetBSD: queue.h,v 1.11 1996/05/16 05:17:14 mycroft Exp $ */ |
3 | ||
4 | /* | |
5 | * Copyright (c) 1991, 1993 | |
6 | * The Regents of the University of California. All rights reserved. | |
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 | * | |
36 | * @(#)queue.h 8.5 (Berkeley) 8/20/94 | |
37 | */ | |
38 | ||
ab33e02a | 39 | #ifndef _FAKE_QUEUE_H_ |
40 | #define _FAKE_QUEUE_H_ | |
41 | ||
42 | /* | |
43 | * Ignore all <sys/queue.h> since older platforms have broken/incomplete | |
44 | * <sys/queue.h> that are too hard to work around. | |
45 | */ | |
46 | #undef SLIST_HEAD | |
47 | #undef SLIST_HEAD_INITIALIZER | |
48 | #undef SLIST_ENTRY | |
49 | #undef SLIST_FIRST | |
50 | #undef SLIST_END | |
51 | #undef SLIST_EMPTY | |
52 | #undef SLIST_NEXT | |
53 | #undef SLIST_FOREACH | |
54 | #undef SLIST_INIT | |
55 | #undef SLIST_INSERT_AFTER | |
56 | #undef SLIST_INSERT_HEAD | |
57 | #undef SLIST_REMOVE_HEAD | |
58 | #undef SLIST_REMOVE | |
59 | #undef LIST_HEAD | |
60 | #undef LIST_HEAD_INITIALIZER | |
61 | #undef LIST_ENTRY | |
62 | #undef LIST_FIRST | |
63 | #undef LIST_END | |
64 | #undef LIST_EMPTY | |
65 | #undef LIST_NEXT | |
66 | #undef LIST_FOREACH | |
67 | #undef LIST_INIT | |
68 | #undef LIST_INSERT_AFTER | |
69 | #undef LIST_INSERT_BEFORE | |
70 | #undef LIST_INSERT_HEAD | |
71 | #undef LIST_REMOVE | |
72 | #undef LIST_REPLACE | |
73 | #undef SIMPLEQ_HEAD | |
74 | #undef SIMPLEQ_HEAD_INITIALIZER | |
75 | #undef SIMPLEQ_ENTRY | |
76 | #undef SIMPLEQ_FIRST | |
77 | #undef SIMPLEQ_END | |
78 | #undef SIMPLEQ_EMPTY | |
79 | #undef SIMPLEQ_NEXT | |
80 | #undef SIMPLEQ_FOREACH | |
81 | #undef SIMPLEQ_INIT | |
82 | #undef SIMPLEQ_INSERT_HEAD | |
83 | #undef SIMPLEQ_INSERT_TAIL | |
84 | #undef SIMPLEQ_INSERT_AFTER | |
85 | #undef SIMPLEQ_REMOVE_HEAD | |
86 | #undef TAILQ_HEAD | |
87 | #undef TAILQ_HEAD_INITIALIZER | |
88 | #undef TAILQ_ENTRY | |
89 | #undef TAILQ_FIRST | |
90 | #undef TAILQ_END | |
91 | #undef TAILQ_NEXT | |
92 | #undef TAILQ_LAST | |
93 | #undef TAILQ_PREV | |
94 | #undef TAILQ_EMPTY | |
95 | #undef TAILQ_FOREACH | |
96 | #undef TAILQ_FOREACH_REVERSE | |
97 | #undef TAILQ_INIT | |
98 | #undef TAILQ_INSERT_HEAD | |
99 | #undef TAILQ_INSERT_TAIL | |
100 | #undef TAILQ_INSERT_AFTER | |
101 | #undef TAILQ_INSERT_BEFORE | |
102 | #undef TAILQ_REMOVE | |
103 | #undef TAILQ_REPLACE | |
104 | #undef CIRCLEQ_HEAD | |
105 | #undef CIRCLEQ_HEAD_INITIALIZER | |
106 | #undef CIRCLEQ_ENTRY | |
107 | #undef CIRCLEQ_FIRST | |
108 | #undef CIRCLEQ_LAST | |
109 | #undef CIRCLEQ_END | |
110 | #undef CIRCLEQ_NEXT | |
111 | #undef CIRCLEQ_PREV | |
112 | #undef CIRCLEQ_EMPTY | |
113 | #undef CIRCLEQ_FOREACH | |
114 | #undef CIRCLEQ_FOREACH_REVERSE | |
115 | #undef CIRCLEQ_INIT | |
116 | #undef CIRCLEQ_INSERT_AFTER | |
117 | #undef CIRCLEQ_INSERT_BEFORE | |
118 | #undef CIRCLEQ_INSERT_HEAD | |
119 | #undef CIRCLEQ_INSERT_TAIL | |
120 | #undef CIRCLEQ_REMOVE | |
121 | #undef CIRCLEQ_REPLACE | |
bf5f69f7 | 122 | |
123 | /* | |
124 | * This file defines five types of data structures: singly-linked lists, | |
125 | * lists, simple queues, tail queues, and circular queues. | |
126 | * | |
127 | * | |
128 | * A singly-linked list is headed by a single forward pointer. The elements | |
129 | * are singly linked for minimum space and pointer manipulation overhead at | |
130 | * the expense of O(n) removal for arbitrary elements. New elements can be | |
131 | * added to the list after an existing element or at the head of the list. | |
132 | * Elements being removed from the head of the list should use the explicit | |
133 | * macro for this purpose for optimum efficiency. A singly-linked list may | |
134 | * only be traversed in the forward direction. Singly-linked lists are ideal | |
135 | * for applications with large datasets and few or no removals or for | |
136 | * implementing a LIFO queue. | |
137 | * | |
138 | * A list is headed by a single forward pointer (or an array of forward | |
139 | * pointers for a hash table header). The elements are doubly linked | |
140 | * so that an arbitrary element can be removed without a need to | |
141 | * traverse the list. New elements can be added to the list before | |
142 | * or after an existing element or at the head of the list. A list | |
143 | * may only be traversed in the forward direction. | |
144 | * | |
145 | * A simple queue is headed by a pair of pointers, one the head of the | |
146 | * list and the other to the tail of the list. The elements are singly | |
147 | * linked to save space, so elements can only be removed from the | |
148 | * head of the list. New elements can be added to the list before or after | |
149 | * an existing element, at the head of the list, or at the end of the | |
150 | * list. A simple queue may only be traversed in the forward direction. | |
151 | * | |
152 | * A tail queue is headed by a pair of pointers, one to the head of the | |
153 | * list and the other to the tail of the list. The elements are doubly | |
154 | * linked so that an arbitrary element can be removed without a need to | |
155 | * traverse the list. New elements can be added to the list before or | |
156 | * after an existing element, at the head of the list, or at the end of | |
157 | * the list. A tail queue may be traversed in either direction. | |
158 | * | |
159 | * A circle queue is headed by a pair of pointers, one to the head of the | |
160 | * list and the other to the tail of the list. The elements are doubly | |
161 | * linked so that an arbitrary element can be removed without a need to | |
162 | * traverse the list. New elements can be added to the list before or after | |
163 | * an existing element, at the head of the list, or at the end of the list. | |
164 | * A circle queue may be traversed in either direction, but has a more | |
165 | * complex end of list detection. | |
166 | * | |
167 | * For details on the use of these macros, see the queue(3) manual page. | |
168 | */ | |
169 | ||
170 | /* | |
171 | * Singly-linked List definitions. | |
172 | */ | |
173 | #define SLIST_HEAD(name, type) \ | |
174 | struct name { \ | |
175 | struct type *slh_first; /* first element */ \ | |
176 | } | |
177 | ||
178 | #define SLIST_HEAD_INITIALIZER(head) \ | |
179 | { NULL } | |
180 | ||
181 | #define SLIST_ENTRY(type) \ | |
182 | struct { \ | |
183 | struct type *sle_next; /* next element */ \ | |
184 | } | |
185 | ||
186 | /* | |
187 | * Singly-linked List access methods. | |
188 | */ | |
189 | #define SLIST_FIRST(head) ((head)->slh_first) | |
190 | #define SLIST_END(head) NULL | |
191 | #define SLIST_EMPTY(head) (SLIST_FIRST(head) == SLIST_END(head)) | |
192 | #define SLIST_NEXT(elm, field) ((elm)->field.sle_next) | |
193 | ||
194 | #define SLIST_FOREACH(var, head, field) \ | |
195 | for((var) = SLIST_FIRST(head); \ | |
196 | (var) != SLIST_END(head); \ | |
197 | (var) = SLIST_NEXT(var, field)) | |
198 | ||
199 | /* | |
200 | * Singly-linked List functions. | |
201 | */ | |
202 | #define SLIST_INIT(head) { \ | |
203 | SLIST_FIRST(head) = SLIST_END(head); \ | |
204 | } | |
205 | ||
206 | #define SLIST_INSERT_AFTER(slistelm, elm, field) do { \ | |
207 | (elm)->field.sle_next = (slistelm)->field.sle_next; \ | |
208 | (slistelm)->field.sle_next = (elm); \ | |
209 | } while (0) | |
210 | ||
211 | #define SLIST_INSERT_HEAD(head, elm, field) do { \ | |
212 | (elm)->field.sle_next = (head)->slh_first; \ | |
213 | (head)->slh_first = (elm); \ | |
214 | } while (0) | |
215 | ||
216 | #define SLIST_REMOVE_HEAD(head, field) do { \ | |
217 | (head)->slh_first = (head)->slh_first->field.sle_next; \ | |
218 | } while (0) | |
219 | ||
1656cbed | 220 | #define SLIST_REMOVE(head, elm, type, field) do { \ |
221 | if ((head)->slh_first == (elm)) { \ | |
222 | SLIST_REMOVE_HEAD((head), field); \ | |
223 | } \ | |
224 | else { \ | |
225 | struct type *curelm = (head)->slh_first; \ | |
226 | while( curelm->field.sle_next != (elm) ) \ | |
227 | curelm = curelm->field.sle_next; \ | |
228 | curelm->field.sle_next = \ | |
229 | curelm->field.sle_next->field.sle_next; \ | |
230 | } \ | |
231 | } while (0) | |
232 | ||
bf5f69f7 | 233 | /* |
234 | * List definitions. | |
235 | */ | |
236 | #define LIST_HEAD(name, type) \ | |
237 | struct name { \ | |
238 | struct type *lh_first; /* first element */ \ | |
239 | } | |
240 | ||
241 | #define LIST_HEAD_INITIALIZER(head) \ | |
242 | { NULL } | |
243 | ||
244 | #define LIST_ENTRY(type) \ | |
245 | struct { \ | |
246 | struct type *le_next; /* next element */ \ | |
247 | struct type **le_prev; /* address of previous next element */ \ | |
248 | } | |
249 | ||
250 | /* | |
251 | * List access methods | |
252 | */ | |
253 | #define LIST_FIRST(head) ((head)->lh_first) | |
254 | #define LIST_END(head) NULL | |
255 | #define LIST_EMPTY(head) (LIST_FIRST(head) == LIST_END(head)) | |
256 | #define LIST_NEXT(elm, field) ((elm)->field.le_next) | |
257 | ||
258 | #define LIST_FOREACH(var, head, field) \ | |
259 | for((var) = LIST_FIRST(head); \ | |
260 | (var)!= LIST_END(head); \ | |
261 | (var) = LIST_NEXT(var, field)) | |
262 | ||
263 | /* | |
264 | * List functions. | |
265 | */ | |
266 | #define LIST_INIT(head) do { \ | |
267 | LIST_FIRST(head) = LIST_END(head); \ | |
268 | } while (0) | |
269 | ||
270 | #define LIST_INSERT_AFTER(listelm, elm, field) do { \ | |
271 | if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \ | |
272 | (listelm)->field.le_next->field.le_prev = \ | |
273 | &(elm)->field.le_next; \ | |
274 | (listelm)->field.le_next = (elm); \ | |
275 | (elm)->field.le_prev = &(listelm)->field.le_next; \ | |
276 | } while (0) | |
277 | ||
278 | #define LIST_INSERT_BEFORE(listelm, elm, field) do { \ | |
279 | (elm)->field.le_prev = (listelm)->field.le_prev; \ | |
280 | (elm)->field.le_next = (listelm); \ | |
281 | *(listelm)->field.le_prev = (elm); \ | |
282 | (listelm)->field.le_prev = &(elm)->field.le_next; \ | |
283 | } while (0) | |
284 | ||
285 | #define LIST_INSERT_HEAD(head, elm, field) do { \ | |
286 | if (((elm)->field.le_next = (head)->lh_first) != NULL) \ | |
287 | (head)->lh_first->field.le_prev = &(elm)->field.le_next;\ | |
288 | (head)->lh_first = (elm); \ | |
289 | (elm)->field.le_prev = &(head)->lh_first; \ | |
290 | } while (0) | |
291 | ||
292 | #define LIST_REMOVE(elm, field) do { \ | |
293 | if ((elm)->field.le_next != NULL) \ | |
294 | (elm)->field.le_next->field.le_prev = \ | |
295 | (elm)->field.le_prev; \ | |
296 | *(elm)->field.le_prev = (elm)->field.le_next; \ | |
297 | } while (0) | |
298 | ||
299 | #define LIST_REPLACE(elm, elm2, field) do { \ | |
300 | if (((elm2)->field.le_next = (elm)->field.le_next) != NULL) \ | |
301 | (elm2)->field.le_next->field.le_prev = \ | |
302 | &(elm2)->field.le_next; \ | |
303 | (elm2)->field.le_prev = (elm)->field.le_prev; \ | |
304 | *(elm2)->field.le_prev = (elm2); \ | |
305 | } while (0) | |
306 | ||
307 | /* | |
308 | * Simple queue definitions. | |
309 | */ | |
310 | #define SIMPLEQ_HEAD(name, type) \ | |
311 | struct name { \ | |
312 | struct type *sqh_first; /* first element */ \ | |
313 | struct type **sqh_last; /* addr of last next element */ \ | |
314 | } | |
315 | ||
316 | #define SIMPLEQ_HEAD_INITIALIZER(head) \ | |
317 | { NULL, &(head).sqh_first } | |
318 | ||
319 | #define SIMPLEQ_ENTRY(type) \ | |
320 | struct { \ | |
321 | struct type *sqe_next; /* next element */ \ | |
322 | } | |
323 | ||
324 | /* | |
325 | * Simple queue access methods. | |
326 | */ | |
327 | #define SIMPLEQ_FIRST(head) ((head)->sqh_first) | |
328 | #define SIMPLEQ_END(head) NULL | |
329 | #define SIMPLEQ_EMPTY(head) (SIMPLEQ_FIRST(head) == SIMPLEQ_END(head)) | |
330 | #define SIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next) | |
331 | ||
332 | #define SIMPLEQ_FOREACH(var, head, field) \ | |
333 | for((var) = SIMPLEQ_FIRST(head); \ | |
334 | (var) != SIMPLEQ_END(head); \ | |
335 | (var) = SIMPLEQ_NEXT(var, field)) | |
336 | ||
337 | /* | |
338 | * Simple queue functions. | |
339 | */ | |
340 | #define SIMPLEQ_INIT(head) do { \ | |
341 | (head)->sqh_first = NULL; \ | |
342 | (head)->sqh_last = &(head)->sqh_first; \ | |
343 | } while (0) | |
344 | ||
345 | #define SIMPLEQ_INSERT_HEAD(head, elm, field) do { \ | |
346 | if (((elm)->field.sqe_next = (head)->sqh_first) == NULL) \ | |
347 | (head)->sqh_last = &(elm)->field.sqe_next; \ | |
348 | (head)->sqh_first = (elm); \ | |
349 | } while (0) | |
350 | ||
351 | #define SIMPLEQ_INSERT_TAIL(head, elm, field) do { \ | |
352 | (elm)->field.sqe_next = NULL; \ | |
353 | *(head)->sqh_last = (elm); \ | |
354 | (head)->sqh_last = &(elm)->field.sqe_next; \ | |
355 | } while (0) | |
356 | ||
357 | #define SIMPLEQ_INSERT_AFTER(head, listelm, elm, field) do { \ | |
358 | if (((elm)->field.sqe_next = (listelm)->field.sqe_next) == NULL)\ | |
359 | (head)->sqh_last = &(elm)->field.sqe_next; \ | |
360 | (listelm)->field.sqe_next = (elm); \ | |
361 | } while (0) | |
362 | ||
363 | #define SIMPLEQ_REMOVE_HEAD(head, elm, field) do { \ | |
364 | if (((head)->sqh_first = (elm)->field.sqe_next) == NULL) \ | |
365 | (head)->sqh_last = &(head)->sqh_first; \ | |
366 | } while (0) | |
367 | ||
368 | /* | |
369 | * Tail queue definitions. | |
370 | */ | |
371 | #define TAILQ_HEAD(name, type) \ | |
372 | struct name { \ | |
373 | struct type *tqh_first; /* first element */ \ | |
374 | struct type **tqh_last; /* addr of last next element */ \ | |
375 | } | |
376 | ||
377 | #define TAILQ_HEAD_INITIALIZER(head) \ | |
378 | { NULL, &(head).tqh_first } | |
379 | ||
380 | #define TAILQ_ENTRY(type) \ | |
381 | struct { \ | |
382 | struct type *tqe_next; /* next element */ \ | |
383 | struct type **tqe_prev; /* address of previous next element */ \ | |
384 | } | |
385 | ||
386 | /* | |
387 | * tail queue access methods | |
388 | */ | |
389 | #define TAILQ_FIRST(head) ((head)->tqh_first) | |
390 | #define TAILQ_END(head) NULL | |
391 | #define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next) | |
392 | #define TAILQ_LAST(head, headname) \ | |
393 | (*(((struct headname *)((head)->tqh_last))->tqh_last)) | |
394 | /* XXX */ | |
395 | #define TAILQ_PREV(elm, headname, field) \ | |
396 | (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last)) | |
397 | #define TAILQ_EMPTY(head) \ | |
398 | (TAILQ_FIRST(head) == TAILQ_END(head)) | |
399 | ||
400 | #define TAILQ_FOREACH(var, head, field) \ | |
401 | for((var) = TAILQ_FIRST(head); \ | |
402 | (var) != TAILQ_END(head); \ | |
403 | (var) = TAILQ_NEXT(var, field)) | |
404 | ||
405 | #define TAILQ_FOREACH_REVERSE(var, head, field, headname) \ | |
406 | for((var) = TAILQ_LAST(head, headname); \ | |
407 | (var) != TAILQ_END(head); \ | |
408 | (var) = TAILQ_PREV(var, headname, field)) | |
409 | ||
410 | /* | |
411 | * Tail queue functions. | |
412 | */ | |
413 | #define TAILQ_INIT(head) do { \ | |
414 | (head)->tqh_first = NULL; \ | |
415 | (head)->tqh_last = &(head)->tqh_first; \ | |
416 | } while (0) | |
417 | ||
418 | #define TAILQ_INSERT_HEAD(head, elm, field) do { \ | |
419 | if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \ | |
420 | (head)->tqh_first->field.tqe_prev = \ | |
421 | &(elm)->field.tqe_next; \ | |
422 | else \ | |
423 | (head)->tqh_last = &(elm)->field.tqe_next; \ | |
424 | (head)->tqh_first = (elm); \ | |
425 | (elm)->field.tqe_prev = &(head)->tqh_first; \ | |
426 | } while (0) | |
427 | ||
428 | #define TAILQ_INSERT_TAIL(head, elm, field) do { \ | |
429 | (elm)->field.tqe_next = NULL; \ | |
430 | (elm)->field.tqe_prev = (head)->tqh_last; \ | |
431 | *(head)->tqh_last = (elm); \ | |
432 | (head)->tqh_last = &(elm)->field.tqe_next; \ | |
433 | } while (0) | |
434 | ||
435 | #define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \ | |
436 | if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\ | |
437 | (elm)->field.tqe_next->field.tqe_prev = \ | |
438 | &(elm)->field.tqe_next; \ | |
439 | else \ | |
440 | (head)->tqh_last = &(elm)->field.tqe_next; \ | |
441 | (listelm)->field.tqe_next = (elm); \ | |
442 | (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \ | |
443 | } while (0) | |
444 | ||
445 | #define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \ | |
446 | (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \ | |
447 | (elm)->field.tqe_next = (listelm); \ | |
448 | *(listelm)->field.tqe_prev = (elm); \ | |
449 | (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \ | |
450 | } while (0) | |
451 | ||
452 | #define TAILQ_REMOVE(head, elm, field) do { \ | |
453 | if (((elm)->field.tqe_next) != NULL) \ | |
454 | (elm)->field.tqe_next->field.tqe_prev = \ | |
455 | (elm)->field.tqe_prev; \ | |
456 | else \ | |
457 | (head)->tqh_last = (elm)->field.tqe_prev; \ | |
458 | *(elm)->field.tqe_prev = (elm)->field.tqe_next; \ | |
459 | } while (0) | |
460 | ||
461 | #define TAILQ_REPLACE(head, elm, elm2, field) do { \ | |
462 | if (((elm2)->field.tqe_next = (elm)->field.tqe_next) != NULL) \ | |
463 | (elm2)->field.tqe_next->field.tqe_prev = \ | |
464 | &(elm2)->field.tqe_next; \ | |
465 | else \ | |
466 | (head)->tqh_last = &(elm2)->field.tqe_next; \ | |
467 | (elm2)->field.tqe_prev = (elm)->field.tqe_prev; \ | |
468 | *(elm2)->field.tqe_prev = (elm2); \ | |
469 | } while (0) | |
470 | ||
471 | /* | |
472 | * Circular queue definitions. | |
473 | */ | |
474 | #define CIRCLEQ_HEAD(name, type) \ | |
475 | struct name { \ | |
476 | struct type *cqh_first; /* first element */ \ | |
477 | struct type *cqh_last; /* last element */ \ | |
478 | } | |
479 | ||
480 | #define CIRCLEQ_HEAD_INITIALIZER(head) \ | |
481 | { CIRCLEQ_END(&head), CIRCLEQ_END(&head) } | |
482 | ||
483 | #define CIRCLEQ_ENTRY(type) \ | |
484 | struct { \ | |
485 | struct type *cqe_next; /* next element */ \ | |
486 | struct type *cqe_prev; /* previous element */ \ | |
487 | } | |
488 | ||
489 | /* | |
490 | * Circular queue access methods | |
491 | */ | |
492 | #define CIRCLEQ_FIRST(head) ((head)->cqh_first) | |
493 | #define CIRCLEQ_LAST(head) ((head)->cqh_last) | |
494 | #define CIRCLEQ_END(head) ((void *)(head)) | |
495 | #define CIRCLEQ_NEXT(elm, field) ((elm)->field.cqe_next) | |
496 | #define CIRCLEQ_PREV(elm, field) ((elm)->field.cqe_prev) | |
497 | #define CIRCLEQ_EMPTY(head) \ | |
498 | (CIRCLEQ_FIRST(head) == CIRCLEQ_END(head)) | |
499 | ||
500 | #define CIRCLEQ_FOREACH(var, head, field) \ | |
501 | for((var) = CIRCLEQ_FIRST(head); \ | |
502 | (var) != CIRCLEQ_END(head); \ | |
503 | (var) = CIRCLEQ_NEXT(var, field)) | |
504 | ||
505 | #define CIRCLEQ_FOREACH_REVERSE(var, head, field) \ | |
506 | for((var) = CIRCLEQ_LAST(head); \ | |
507 | (var) != CIRCLEQ_END(head); \ | |
508 | (var) = CIRCLEQ_PREV(var, field)) | |
509 | ||
510 | /* | |
511 | * Circular queue functions. | |
512 | */ | |
513 | #define CIRCLEQ_INIT(head) do { \ | |
514 | (head)->cqh_first = CIRCLEQ_END(head); \ | |
515 | (head)->cqh_last = CIRCLEQ_END(head); \ | |
516 | } while (0) | |
517 | ||
518 | #define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \ | |
519 | (elm)->field.cqe_next = (listelm)->field.cqe_next; \ | |
520 | (elm)->field.cqe_prev = (listelm); \ | |
521 | if ((listelm)->field.cqe_next == CIRCLEQ_END(head)) \ | |
522 | (head)->cqh_last = (elm); \ | |
523 | else \ | |
524 | (listelm)->field.cqe_next->field.cqe_prev = (elm); \ | |
525 | (listelm)->field.cqe_next = (elm); \ | |
526 | } while (0) | |
527 | ||
528 | #define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \ | |
529 | (elm)->field.cqe_next = (listelm); \ | |
530 | (elm)->field.cqe_prev = (listelm)->field.cqe_prev; \ | |
531 | if ((listelm)->field.cqe_prev == CIRCLEQ_END(head)) \ | |
532 | (head)->cqh_first = (elm); \ | |
533 | else \ | |
534 | (listelm)->field.cqe_prev->field.cqe_next = (elm); \ | |
535 | (listelm)->field.cqe_prev = (elm); \ | |
536 | } while (0) | |
537 | ||
538 | #define CIRCLEQ_INSERT_HEAD(head, elm, field) do { \ | |
539 | (elm)->field.cqe_next = (head)->cqh_first; \ | |
540 | (elm)->field.cqe_prev = CIRCLEQ_END(head); \ | |
541 | if ((head)->cqh_last == CIRCLEQ_END(head)) \ | |
542 | (head)->cqh_last = (elm); \ | |
543 | else \ | |
544 | (head)->cqh_first->field.cqe_prev = (elm); \ | |
545 | (head)->cqh_first = (elm); \ | |
546 | } while (0) | |
547 | ||
548 | #define CIRCLEQ_INSERT_TAIL(head, elm, field) do { \ | |
549 | (elm)->field.cqe_next = CIRCLEQ_END(head); \ | |
550 | (elm)->field.cqe_prev = (head)->cqh_last; \ | |
551 | if ((head)->cqh_first == CIRCLEQ_END(head)) \ | |
552 | (head)->cqh_first = (elm); \ | |
553 | else \ | |
554 | (head)->cqh_last->field.cqe_next = (elm); \ | |
555 | (head)->cqh_last = (elm); \ | |
556 | } while (0) | |
557 | ||
558 | #define CIRCLEQ_REMOVE(head, elm, field) do { \ | |
559 | if ((elm)->field.cqe_next == CIRCLEQ_END(head)) \ | |
560 | (head)->cqh_last = (elm)->field.cqe_prev; \ | |
561 | else \ | |
562 | (elm)->field.cqe_next->field.cqe_prev = \ | |
563 | (elm)->field.cqe_prev; \ | |
564 | if ((elm)->field.cqe_prev == CIRCLEQ_END(head)) \ | |
565 | (head)->cqh_first = (elm)->field.cqe_next; \ | |
566 | else \ | |
567 | (elm)->field.cqe_prev->field.cqe_next = \ | |
568 | (elm)->field.cqe_next; \ | |
569 | } while (0) | |
570 | ||
571 | #define CIRCLEQ_REPLACE(head, elm, elm2, field) do { \ | |
572 | if (((elm2)->field.cqe_next = (elm)->field.cqe_next) == \ | |
573 | CIRCLEQ_END(head)) \ | |
574 | (head).cqh_last = (elm2); \ | |
575 | else \ | |
576 | (elm2)->field.cqe_next->field.cqe_prev = (elm2); \ | |
577 | if (((elm2)->field.cqe_prev = (elm)->field.cqe_prev) == \ | |
578 | CIRCLEQ_END(head)) \ | |
579 | (head).cqh_first = (elm2); \ | |
580 | else \ | |
581 | (elm2)->field.cqe_prev->field.cqe_next = (elm2); \ | |
582 | } while (0) | |
583 | ||
ab33e02a | 584 | #endif /* !_FAKE_QUEUE_H_ */ |