Annotation of sys/sys/queue.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: queue.h,v 1.32 2007/04/30 18:42:34 pedro Exp $ */
! 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. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: *
! 32: * @(#)queue.h 8.5 (Berkeley) 8/20/94
! 33: */
! 34:
! 35: #ifndef _SYS_QUEUE_H_
! 36: #define _SYS_QUEUE_H_
! 37:
! 38: /*
! 39: * This file defines five types of data structures: singly-linked lists,
! 40: * lists, simple queues, tail queues, and circular queues.
! 41: *
! 42: *
! 43: * A singly-linked list is headed by a single forward pointer. The elements
! 44: * are singly linked for minimum space and pointer manipulation overhead at
! 45: * the expense of O(n) removal for arbitrary elements. New elements can be
! 46: * added to the list after an existing element or at the head of the list.
! 47: * Elements being removed from the head of the list should use the explicit
! 48: * macro for this purpose for optimum efficiency. A singly-linked list may
! 49: * only be traversed in the forward direction. Singly-linked lists are ideal
! 50: * for applications with large datasets and few or no removals or for
! 51: * implementing a LIFO queue.
! 52: *
! 53: * A list is headed by a single forward pointer (or an array of forward
! 54: * pointers for a hash table header). The elements are doubly linked
! 55: * so that an arbitrary element can be removed without a need to
! 56: * traverse the list. New elements can be added to the list before
! 57: * or after an existing element or at the head of the list. A list
! 58: * may only be traversed in the forward direction.
! 59: *
! 60: * A simple queue is headed by a pair of pointers, one the head of the
! 61: * list and the other to the tail of the list. The elements are singly
! 62: * linked to save space, so elements can only be removed from the
! 63: * head of the list. New elements can be added to the list before or after
! 64: * an existing element, at the head of the list, or at the end of the
! 65: * list. A simple queue may only be traversed in the forward direction.
! 66: *
! 67: * A tail queue is headed by a pair of pointers, one to the head of the
! 68: * list and the other to the tail of the list. The elements are doubly
! 69: * linked so that an arbitrary element can be removed without a need to
! 70: * traverse the list. New elements can be added to the list before or
! 71: * after an existing element, at the head of the list, or at the end of
! 72: * the list. A tail queue may be traversed in either direction.
! 73: *
! 74: * A circle queue is headed by a pair of pointers, one to the head of the
! 75: * list and the other to the tail of the list. The elements are doubly
! 76: * linked so that an arbitrary element can be removed without a need to
! 77: * traverse the list. New elements can be added to the list before or after
! 78: * an existing element, at the head of the list, or at the end of the list.
! 79: * A circle queue may be traversed in either direction, but has a more
! 80: * complex end of list detection.
! 81: *
! 82: * For details on the use of these macros, see the queue(3) manual page.
! 83: */
! 84:
! 85: #if defined(QUEUE_MACRO_DEBUG) || (defined(_KERNEL) && defined(DIAGNOSTIC))
! 86: #define _Q_INVALIDATE(a) (a) = ((void *)-1)
! 87: #else
! 88: #define _Q_INVALIDATE(a)
! 89: #endif
! 90:
! 91: /*
! 92: * Singly-linked List definitions.
! 93: */
! 94: #define SLIST_HEAD(name, type) \
! 95: struct name { \
! 96: struct type *slh_first; /* first element */ \
! 97: }
! 98:
! 99: #define SLIST_HEAD_INITIALIZER(head) \
! 100: { NULL }
! 101:
! 102: #define SLIST_ENTRY(type) \
! 103: struct { \
! 104: struct type *sle_next; /* next element */ \
! 105: }
! 106:
! 107: /*
! 108: * Singly-linked List access methods.
! 109: */
! 110: #define SLIST_FIRST(head) ((head)->slh_first)
! 111: #define SLIST_END(head) NULL
! 112: #define SLIST_EMPTY(head) (SLIST_FIRST(head) == SLIST_END(head))
! 113: #define SLIST_NEXT(elm, field) ((elm)->field.sle_next)
! 114:
! 115: #define SLIST_FOREACH(var, head, field) \
! 116: for((var) = SLIST_FIRST(head); \
! 117: (var) != SLIST_END(head); \
! 118: (var) = SLIST_NEXT(var, field))
! 119:
! 120: #define SLIST_FOREACH_PREVPTR(var, varp, head, field) \
! 121: for ((varp) = &SLIST_FIRST((head)); \
! 122: ((var) = *(varp)) != SLIST_END(head); \
! 123: (varp) = &SLIST_NEXT((var), field))
! 124:
! 125: /*
! 126: * Singly-linked List functions.
! 127: */
! 128: #define SLIST_INIT(head) { \
! 129: SLIST_FIRST(head) = SLIST_END(head); \
! 130: }
! 131:
! 132: #define SLIST_INSERT_AFTER(slistelm, elm, field) do { \
! 133: (elm)->field.sle_next = (slistelm)->field.sle_next; \
! 134: (slistelm)->field.sle_next = (elm); \
! 135: } while (0)
! 136:
! 137: #define SLIST_INSERT_HEAD(head, elm, field) do { \
! 138: (elm)->field.sle_next = (head)->slh_first; \
! 139: (head)->slh_first = (elm); \
! 140: } while (0)
! 141:
! 142: #define SLIST_REMOVE_NEXT(head, elm, field) do { \
! 143: (elm)->field.sle_next = (elm)->field.sle_next->field.sle_next; \
! 144: } while (0)
! 145:
! 146: #define SLIST_REMOVE_HEAD(head, field) do { \
! 147: (head)->slh_first = (head)->slh_first->field.sle_next; \
! 148: } while (0)
! 149:
! 150: #define SLIST_REMOVE(head, elm, type, field) do { \
! 151: if ((head)->slh_first == (elm)) { \
! 152: SLIST_REMOVE_HEAD((head), field); \
! 153: } else { \
! 154: struct type *curelm = (head)->slh_first; \
! 155: \
! 156: while (curelm->field.sle_next != (elm)) \
! 157: curelm = curelm->field.sle_next; \
! 158: curelm->field.sle_next = \
! 159: curelm->field.sle_next->field.sle_next; \
! 160: _Q_INVALIDATE((elm)->field.sle_next); \
! 161: } \
! 162: } while (0)
! 163:
! 164: /*
! 165: * List definitions.
! 166: */
! 167: #define LIST_HEAD(name, type) \
! 168: struct name { \
! 169: struct type *lh_first; /* first element */ \
! 170: }
! 171:
! 172: #define LIST_HEAD_INITIALIZER(head) \
! 173: { NULL }
! 174:
! 175: #define LIST_ENTRY(type) \
! 176: struct { \
! 177: struct type *le_next; /* next element */ \
! 178: struct type **le_prev; /* address of previous next element */ \
! 179: }
! 180:
! 181: /*
! 182: * List access methods
! 183: */
! 184: #define LIST_FIRST(head) ((head)->lh_first)
! 185: #define LIST_END(head) NULL
! 186: #define LIST_EMPTY(head) (LIST_FIRST(head) == LIST_END(head))
! 187: #define LIST_NEXT(elm, field) ((elm)->field.le_next)
! 188:
! 189: #define LIST_FOREACH(var, head, field) \
! 190: for((var) = LIST_FIRST(head); \
! 191: (var)!= LIST_END(head); \
! 192: (var) = LIST_NEXT(var, field))
! 193:
! 194: /*
! 195: * List functions.
! 196: */
! 197: #define LIST_INIT(head) do { \
! 198: LIST_FIRST(head) = LIST_END(head); \
! 199: } while (0)
! 200:
! 201: #define LIST_INSERT_AFTER(listelm, elm, field) do { \
! 202: if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \
! 203: (listelm)->field.le_next->field.le_prev = \
! 204: &(elm)->field.le_next; \
! 205: (listelm)->field.le_next = (elm); \
! 206: (elm)->field.le_prev = &(listelm)->field.le_next; \
! 207: } while (0)
! 208:
! 209: #define LIST_INSERT_BEFORE(listelm, elm, field) do { \
! 210: (elm)->field.le_prev = (listelm)->field.le_prev; \
! 211: (elm)->field.le_next = (listelm); \
! 212: *(listelm)->field.le_prev = (elm); \
! 213: (listelm)->field.le_prev = &(elm)->field.le_next; \
! 214: } while (0)
! 215:
! 216: #define LIST_INSERT_HEAD(head, elm, field) do { \
! 217: if (((elm)->field.le_next = (head)->lh_first) != NULL) \
! 218: (head)->lh_first->field.le_prev = &(elm)->field.le_next;\
! 219: (head)->lh_first = (elm); \
! 220: (elm)->field.le_prev = &(head)->lh_first; \
! 221: } while (0)
! 222:
! 223: #define LIST_REMOVE(elm, field) do { \
! 224: if ((elm)->field.le_next != NULL) \
! 225: (elm)->field.le_next->field.le_prev = \
! 226: (elm)->field.le_prev; \
! 227: *(elm)->field.le_prev = (elm)->field.le_next; \
! 228: _Q_INVALIDATE((elm)->field.le_prev); \
! 229: _Q_INVALIDATE((elm)->field.le_next); \
! 230: } while (0)
! 231:
! 232: #define LIST_REPLACE(elm, elm2, field) do { \
! 233: if (((elm2)->field.le_next = (elm)->field.le_next) != NULL) \
! 234: (elm2)->field.le_next->field.le_prev = \
! 235: &(elm2)->field.le_next; \
! 236: (elm2)->field.le_prev = (elm)->field.le_prev; \
! 237: *(elm2)->field.le_prev = (elm2); \
! 238: _Q_INVALIDATE((elm)->field.le_prev); \
! 239: _Q_INVALIDATE((elm)->field.le_next); \
! 240: } while (0)
! 241:
! 242: /*
! 243: * Simple queue definitions.
! 244: */
! 245: #define SIMPLEQ_HEAD(name, type) \
! 246: struct name { \
! 247: struct type *sqh_first; /* first element */ \
! 248: struct type **sqh_last; /* addr of last next element */ \
! 249: }
! 250:
! 251: #define SIMPLEQ_HEAD_INITIALIZER(head) \
! 252: { NULL, &(head).sqh_first }
! 253:
! 254: #define SIMPLEQ_ENTRY(type) \
! 255: struct { \
! 256: struct type *sqe_next; /* next element */ \
! 257: }
! 258:
! 259: /*
! 260: * Simple queue access methods.
! 261: */
! 262: #define SIMPLEQ_FIRST(head) ((head)->sqh_first)
! 263: #define SIMPLEQ_END(head) NULL
! 264: #define SIMPLEQ_EMPTY(head) (SIMPLEQ_FIRST(head) == SIMPLEQ_END(head))
! 265: #define SIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next)
! 266:
! 267: #define SIMPLEQ_FOREACH(var, head, field) \
! 268: for((var) = SIMPLEQ_FIRST(head); \
! 269: (var) != SIMPLEQ_END(head); \
! 270: (var) = SIMPLEQ_NEXT(var, field))
! 271:
! 272: /*
! 273: * Simple queue functions.
! 274: */
! 275: #define SIMPLEQ_INIT(head) do { \
! 276: (head)->sqh_first = NULL; \
! 277: (head)->sqh_last = &(head)->sqh_first; \
! 278: } while (0)
! 279:
! 280: #define SIMPLEQ_INSERT_HEAD(head, elm, field) do { \
! 281: if (((elm)->field.sqe_next = (head)->sqh_first) == NULL) \
! 282: (head)->sqh_last = &(elm)->field.sqe_next; \
! 283: (head)->sqh_first = (elm); \
! 284: } while (0)
! 285:
! 286: #define SIMPLEQ_INSERT_TAIL(head, elm, field) do { \
! 287: (elm)->field.sqe_next = NULL; \
! 288: *(head)->sqh_last = (elm); \
! 289: (head)->sqh_last = &(elm)->field.sqe_next; \
! 290: } while (0)
! 291:
! 292: #define SIMPLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
! 293: if (((elm)->field.sqe_next = (listelm)->field.sqe_next) == NULL)\
! 294: (head)->sqh_last = &(elm)->field.sqe_next; \
! 295: (listelm)->field.sqe_next = (elm); \
! 296: } while (0)
! 297:
! 298: #define SIMPLEQ_REMOVE_HEAD(head, field) do { \
! 299: if (((head)->sqh_first = (head)->sqh_first->field.sqe_next) == NULL) \
! 300: (head)->sqh_last = &(head)->sqh_first; \
! 301: } while (0)
! 302:
! 303: /*
! 304: * Tail queue definitions.
! 305: */
! 306: #define TAILQ_HEAD(name, type) \
! 307: struct name { \
! 308: struct type *tqh_first; /* first element */ \
! 309: struct type **tqh_last; /* addr of last next element */ \
! 310: }
! 311:
! 312: #define TAILQ_HEAD_INITIALIZER(head) \
! 313: { NULL, &(head).tqh_first }
! 314:
! 315: #define TAILQ_ENTRY(type) \
! 316: struct { \
! 317: struct type *tqe_next; /* next element */ \
! 318: struct type **tqe_prev; /* address of previous next element */ \
! 319: }
! 320:
! 321: /*
! 322: * tail queue access methods
! 323: */
! 324: #define TAILQ_FIRST(head) ((head)->tqh_first)
! 325: #define TAILQ_END(head) NULL
! 326: #define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
! 327: #define TAILQ_LAST(head, headname) \
! 328: (*(((struct headname *)((head)->tqh_last))->tqh_last))
! 329: /* XXX */
! 330: #define TAILQ_PREV(elm, headname, field) \
! 331: (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
! 332: #define TAILQ_EMPTY(head) \
! 333: (TAILQ_FIRST(head) == TAILQ_END(head))
! 334:
! 335: #define TAILQ_FOREACH(var, head, field) \
! 336: for((var) = TAILQ_FIRST(head); \
! 337: (var) != TAILQ_END(head); \
! 338: (var) = TAILQ_NEXT(var, field))
! 339:
! 340: #define TAILQ_FOREACH_REVERSE(var, head, headname, field) \
! 341: for((var) = TAILQ_LAST(head, headname); \
! 342: (var) != TAILQ_END(head); \
! 343: (var) = TAILQ_PREV(var, headname, field))
! 344:
! 345: /*
! 346: * Tail queue functions.
! 347: */
! 348: #define TAILQ_INIT(head) do { \
! 349: (head)->tqh_first = NULL; \
! 350: (head)->tqh_last = &(head)->tqh_first; \
! 351: } while (0)
! 352:
! 353: #define TAILQ_INSERT_HEAD(head, elm, field) do { \
! 354: if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
! 355: (head)->tqh_first->field.tqe_prev = \
! 356: &(elm)->field.tqe_next; \
! 357: else \
! 358: (head)->tqh_last = &(elm)->field.tqe_next; \
! 359: (head)->tqh_first = (elm); \
! 360: (elm)->field.tqe_prev = &(head)->tqh_first; \
! 361: } while (0)
! 362:
! 363: #define TAILQ_INSERT_TAIL(head, elm, field) do { \
! 364: (elm)->field.tqe_next = NULL; \
! 365: (elm)->field.tqe_prev = (head)->tqh_last; \
! 366: *(head)->tqh_last = (elm); \
! 367: (head)->tqh_last = &(elm)->field.tqe_next; \
! 368: } while (0)
! 369:
! 370: #define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
! 371: if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
! 372: (elm)->field.tqe_next->field.tqe_prev = \
! 373: &(elm)->field.tqe_next; \
! 374: else \
! 375: (head)->tqh_last = &(elm)->field.tqe_next; \
! 376: (listelm)->field.tqe_next = (elm); \
! 377: (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
! 378: } while (0)
! 379:
! 380: #define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
! 381: (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
! 382: (elm)->field.tqe_next = (listelm); \
! 383: *(listelm)->field.tqe_prev = (elm); \
! 384: (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \
! 385: } while (0)
! 386:
! 387: #define TAILQ_REMOVE(head, elm, field) do { \
! 388: if (((elm)->field.tqe_next) != NULL) \
! 389: (elm)->field.tqe_next->field.tqe_prev = \
! 390: (elm)->field.tqe_prev; \
! 391: else \
! 392: (head)->tqh_last = (elm)->field.tqe_prev; \
! 393: *(elm)->field.tqe_prev = (elm)->field.tqe_next; \
! 394: _Q_INVALIDATE((elm)->field.tqe_prev); \
! 395: _Q_INVALIDATE((elm)->field.tqe_next); \
! 396: } while (0)
! 397:
! 398: #define TAILQ_REPLACE(head, elm, elm2, field) do { \
! 399: if (((elm2)->field.tqe_next = (elm)->field.tqe_next) != NULL) \
! 400: (elm2)->field.tqe_next->field.tqe_prev = \
! 401: &(elm2)->field.tqe_next; \
! 402: else \
! 403: (head)->tqh_last = &(elm2)->field.tqe_next; \
! 404: (elm2)->field.tqe_prev = (elm)->field.tqe_prev; \
! 405: *(elm2)->field.tqe_prev = (elm2); \
! 406: _Q_INVALIDATE((elm)->field.tqe_prev); \
! 407: _Q_INVALIDATE((elm)->field.tqe_next); \
! 408: } while (0)
! 409:
! 410: /*
! 411: * Circular queue definitions.
! 412: */
! 413: #define CIRCLEQ_HEAD(name, type) \
! 414: struct name { \
! 415: struct type *cqh_first; /* first element */ \
! 416: struct type *cqh_last; /* last element */ \
! 417: }
! 418:
! 419: #define CIRCLEQ_HEAD_INITIALIZER(head) \
! 420: { CIRCLEQ_END(&head), CIRCLEQ_END(&head) }
! 421:
! 422: #define CIRCLEQ_ENTRY(type) \
! 423: struct { \
! 424: struct type *cqe_next; /* next element */ \
! 425: struct type *cqe_prev; /* previous element */ \
! 426: }
! 427:
! 428: /*
! 429: * Circular queue access methods
! 430: */
! 431: #define CIRCLEQ_FIRST(head) ((head)->cqh_first)
! 432: #define CIRCLEQ_LAST(head) ((head)->cqh_last)
! 433: #define CIRCLEQ_END(head) ((void *)(head))
! 434: #define CIRCLEQ_NEXT(elm, field) ((elm)->field.cqe_next)
! 435: #define CIRCLEQ_PREV(elm, field) ((elm)->field.cqe_prev)
! 436: #define CIRCLEQ_EMPTY(head) \
! 437: (CIRCLEQ_FIRST(head) == CIRCLEQ_END(head))
! 438:
! 439: #define CIRCLEQ_FOREACH(var, head, field) \
! 440: for((var) = CIRCLEQ_FIRST(head); \
! 441: (var) != CIRCLEQ_END(head); \
! 442: (var) = CIRCLEQ_NEXT(var, field))
! 443:
! 444: #define CIRCLEQ_FOREACH_REVERSE(var, head, field) \
! 445: for((var) = CIRCLEQ_LAST(head); \
! 446: (var) != CIRCLEQ_END(head); \
! 447: (var) = CIRCLEQ_PREV(var, field))
! 448:
! 449: /*
! 450: * Circular queue functions.
! 451: */
! 452: #define CIRCLEQ_INIT(head) do { \
! 453: (head)->cqh_first = CIRCLEQ_END(head); \
! 454: (head)->cqh_last = CIRCLEQ_END(head); \
! 455: } while (0)
! 456:
! 457: #define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
! 458: (elm)->field.cqe_next = (listelm)->field.cqe_next; \
! 459: (elm)->field.cqe_prev = (listelm); \
! 460: if ((listelm)->field.cqe_next == CIRCLEQ_END(head)) \
! 461: (head)->cqh_last = (elm); \
! 462: else \
! 463: (listelm)->field.cqe_next->field.cqe_prev = (elm); \
! 464: (listelm)->field.cqe_next = (elm); \
! 465: } while (0)
! 466:
! 467: #define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \
! 468: (elm)->field.cqe_next = (listelm); \
! 469: (elm)->field.cqe_prev = (listelm)->field.cqe_prev; \
! 470: if ((listelm)->field.cqe_prev == CIRCLEQ_END(head)) \
! 471: (head)->cqh_first = (elm); \
! 472: else \
! 473: (listelm)->field.cqe_prev->field.cqe_next = (elm); \
! 474: (listelm)->field.cqe_prev = (elm); \
! 475: } while (0)
! 476:
! 477: #define CIRCLEQ_INSERT_HEAD(head, elm, field) do { \
! 478: (elm)->field.cqe_next = (head)->cqh_first; \
! 479: (elm)->field.cqe_prev = CIRCLEQ_END(head); \
! 480: if ((head)->cqh_last == CIRCLEQ_END(head)) \
! 481: (head)->cqh_last = (elm); \
! 482: else \
! 483: (head)->cqh_first->field.cqe_prev = (elm); \
! 484: (head)->cqh_first = (elm); \
! 485: } while (0)
! 486:
! 487: #define CIRCLEQ_INSERT_TAIL(head, elm, field) do { \
! 488: (elm)->field.cqe_next = CIRCLEQ_END(head); \
! 489: (elm)->field.cqe_prev = (head)->cqh_last; \
! 490: if ((head)->cqh_first == CIRCLEQ_END(head)) \
! 491: (head)->cqh_first = (elm); \
! 492: else \
! 493: (head)->cqh_last->field.cqe_next = (elm); \
! 494: (head)->cqh_last = (elm); \
! 495: } while (0)
! 496:
! 497: #define CIRCLEQ_REMOVE(head, elm, field) do { \
! 498: if ((elm)->field.cqe_next == CIRCLEQ_END(head)) \
! 499: (head)->cqh_last = (elm)->field.cqe_prev; \
! 500: else \
! 501: (elm)->field.cqe_next->field.cqe_prev = \
! 502: (elm)->field.cqe_prev; \
! 503: if ((elm)->field.cqe_prev == CIRCLEQ_END(head)) \
! 504: (head)->cqh_first = (elm)->field.cqe_next; \
! 505: else \
! 506: (elm)->field.cqe_prev->field.cqe_next = \
! 507: (elm)->field.cqe_next; \
! 508: _Q_INVALIDATE((elm)->field.cqe_prev); \
! 509: _Q_INVALIDATE((elm)->field.cqe_next); \
! 510: } while (0)
! 511:
! 512: #define CIRCLEQ_REPLACE(head, elm, elm2, field) do { \
! 513: if (((elm2)->field.cqe_next = (elm)->field.cqe_next) == \
! 514: CIRCLEQ_END(head)) \
! 515: (head).cqh_last = (elm2); \
! 516: else \
! 517: (elm2)->field.cqe_next->field.cqe_prev = (elm2); \
! 518: if (((elm2)->field.cqe_prev = (elm)->field.cqe_prev) == \
! 519: CIRCLEQ_END(head)) \
! 520: (head).cqh_first = (elm2); \
! 521: else \
! 522: (elm2)->field.cqe_prev->field.cqe_next = (elm2); \
! 523: _Q_INVALIDATE((elm)->field.cqe_prev); \
! 524: _Q_INVALIDATE((elm)->field.cqe_next); \
! 525: } while (0)
! 526:
! 527: #endif /* !_SYS_QUEUE_H_ */
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