Annotation of embedaddon/miniupnpd/bsdqueue.h, revision 1.1
1.1 ! misho 1: /* $OpenBSD: queue.h,v 1.31 2005/11/25 08:06:25 otto 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: #ifdef QUEUE_MACRO_DEBUG
! 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: #ifdef SLIST_ENTRY
! 103: #undef SLIST_ENTRY
! 104: #endif
! 105:
! 106: #define SLIST_ENTRY(type) \
! 107: struct { \
! 108: struct type *sle_next; /* next element */ \
! 109: }
! 110:
! 111: /*
! 112: * Singly-linked List access methods.
! 113: */
! 114: #define SLIST_FIRST(head) ((head)->slh_first)
! 115: #define SLIST_END(head) NULL
! 116: #define SLIST_EMPTY(head) (SLIST_FIRST(head) == SLIST_END(head))
! 117: #define SLIST_NEXT(elm, field) ((elm)->field.sle_next)
! 118:
! 119: #define SLIST_FOREACH(var, head, field) \
! 120: for((var) = SLIST_FIRST(head); \
! 121: (var) != SLIST_END(head); \
! 122: (var) = SLIST_NEXT(var, field))
! 123:
! 124: #define SLIST_FOREACH_PREVPTR(var, varp, head, field) \
! 125: for ((varp) = &SLIST_FIRST((head)); \
! 126: ((var) = *(varp)) != SLIST_END(head); \
! 127: (varp) = &SLIST_NEXT((var), field))
! 128:
! 129: /*
! 130: * Singly-linked List functions.
! 131: */
! 132: #define SLIST_INIT(head) { \
! 133: SLIST_FIRST(head) = SLIST_END(head); \
! 134: }
! 135:
! 136: #define SLIST_INSERT_AFTER(slistelm, elm, field) do { \
! 137: (elm)->field.sle_next = (slistelm)->field.sle_next; \
! 138: (slistelm)->field.sle_next = (elm); \
! 139: } while (0)
! 140:
! 141: #define SLIST_INSERT_HEAD(head, elm, field) do { \
! 142: (elm)->field.sle_next = (head)->slh_first; \
! 143: (head)->slh_first = (elm); \
! 144: } while (0)
! 145:
! 146: #define SLIST_REMOVE_NEXT(head, elm, field) do { \
! 147: (elm)->field.sle_next = (elm)->field.sle_next->field.sle_next; \
! 148: } while (0)
! 149:
! 150: #define SLIST_REMOVE_HEAD(head, field) do { \
! 151: (head)->slh_first = (head)->slh_first->field.sle_next; \
! 152: } while (0)
! 153:
! 154: #define SLIST_REMOVE(head, elm, type, field) do { \
! 155: if ((head)->slh_first == (elm)) { \
! 156: SLIST_REMOVE_HEAD((head), field); \
! 157: } else { \
! 158: struct type *curelm = (head)->slh_first; \
! 159: \
! 160: while (curelm->field.sle_next != (elm)) \
! 161: curelm = curelm->field.sle_next; \
! 162: curelm->field.sle_next = \
! 163: curelm->field.sle_next->field.sle_next; \
! 164: _Q_INVALIDATE((elm)->field.sle_next); \
! 165: } \
! 166: } while (0)
! 167:
! 168: /*
! 169: * List definitions.
! 170: */
! 171: #define LIST_HEAD(name, type) \
! 172: struct name { \
! 173: struct type *lh_first; /* first element */ \
! 174: }
! 175:
! 176: #define LIST_HEAD_INITIALIZER(head) \
! 177: { NULL }
! 178:
! 179: #define LIST_ENTRY(type) \
! 180: struct { \
! 181: struct type *le_next; /* next element */ \
! 182: struct type **le_prev; /* address of previous next element */ \
! 183: }
! 184:
! 185: /*
! 186: * List access methods
! 187: */
! 188: #define LIST_FIRST(head) ((head)->lh_first)
! 189: #define LIST_END(head) NULL
! 190: #define LIST_EMPTY(head) (LIST_FIRST(head) == LIST_END(head))
! 191: #define LIST_NEXT(elm, field) ((elm)->field.le_next)
! 192:
! 193: #define LIST_FOREACH(var, head, field) \
! 194: for((var) = LIST_FIRST(head); \
! 195: (var)!= LIST_END(head); \
! 196: (var) = LIST_NEXT(var, field))
! 197:
! 198: /*
! 199: * List functions.
! 200: */
! 201: #define LIST_INIT(head) do { \
! 202: LIST_FIRST(head) = LIST_END(head); \
! 203: } while (0)
! 204:
! 205: #define LIST_INSERT_AFTER(listelm, elm, field) do { \
! 206: if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \
! 207: (listelm)->field.le_next->field.le_prev = \
! 208: &(elm)->field.le_next; \
! 209: (listelm)->field.le_next = (elm); \
! 210: (elm)->field.le_prev = &(listelm)->field.le_next; \
! 211: } while (0)
! 212:
! 213: #define LIST_INSERT_BEFORE(listelm, elm, field) do { \
! 214: (elm)->field.le_prev = (listelm)->field.le_prev; \
! 215: (elm)->field.le_next = (listelm); \
! 216: *(listelm)->field.le_prev = (elm); \
! 217: (listelm)->field.le_prev = &(elm)->field.le_next; \
! 218: } while (0)
! 219:
! 220: #define LIST_INSERT_HEAD(head, elm, field) do { \
! 221: if (((elm)->field.le_next = (head)->lh_first) != NULL) \
! 222: (head)->lh_first->field.le_prev = &(elm)->field.le_next;\
! 223: (head)->lh_first = (elm); \
! 224: (elm)->field.le_prev = &(head)->lh_first; \
! 225: } while (0)
! 226:
! 227: #define LIST_REMOVE(elm, field) do { \
! 228: if ((elm)->field.le_next != NULL) \
! 229: (elm)->field.le_next->field.le_prev = \
! 230: (elm)->field.le_prev; \
! 231: *(elm)->field.le_prev = (elm)->field.le_next; \
! 232: _Q_INVALIDATE((elm)->field.le_prev); \
! 233: _Q_INVALIDATE((elm)->field.le_next); \
! 234: } while (0)
! 235:
! 236: #define LIST_REPLACE(elm, elm2, field) do { \
! 237: if (((elm2)->field.le_next = (elm)->field.le_next) != NULL) \
! 238: (elm2)->field.le_next->field.le_prev = \
! 239: &(elm2)->field.le_next; \
! 240: (elm2)->field.le_prev = (elm)->field.le_prev; \
! 241: *(elm2)->field.le_prev = (elm2); \
! 242: _Q_INVALIDATE((elm)->field.le_prev); \
! 243: _Q_INVALIDATE((elm)->field.le_next); \
! 244: } while (0)
! 245:
! 246: /*
! 247: * Simple queue definitions.
! 248: */
! 249: #define SIMPLEQ_HEAD(name, type) \
! 250: struct name { \
! 251: struct type *sqh_first; /* first element */ \
! 252: struct type **sqh_last; /* addr of last next element */ \
! 253: }
! 254:
! 255: #define SIMPLEQ_HEAD_INITIALIZER(head) \
! 256: { NULL, &(head).sqh_first }
! 257:
! 258: #define SIMPLEQ_ENTRY(type) \
! 259: struct { \
! 260: struct type *sqe_next; /* next element */ \
! 261: }
! 262:
! 263: /*
! 264: * Simple queue access methods.
! 265: */
! 266: #define SIMPLEQ_FIRST(head) ((head)->sqh_first)
! 267: #define SIMPLEQ_END(head) NULL
! 268: #define SIMPLEQ_EMPTY(head) (SIMPLEQ_FIRST(head) == SIMPLEQ_END(head))
! 269: #define SIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next)
! 270:
! 271: #define SIMPLEQ_FOREACH(var, head, field) \
! 272: for((var) = SIMPLEQ_FIRST(head); \
! 273: (var) != SIMPLEQ_END(head); \
! 274: (var) = SIMPLEQ_NEXT(var, field))
! 275:
! 276: /*
! 277: * Simple queue functions.
! 278: */
! 279: #define SIMPLEQ_INIT(head) do { \
! 280: (head)->sqh_first = NULL; \
! 281: (head)->sqh_last = &(head)->sqh_first; \
! 282: } while (0)
! 283:
! 284: #define SIMPLEQ_INSERT_HEAD(head, elm, field) do { \
! 285: if (((elm)->field.sqe_next = (head)->sqh_first) == NULL) \
! 286: (head)->sqh_last = &(elm)->field.sqe_next; \
! 287: (head)->sqh_first = (elm); \
! 288: } while (0)
! 289:
! 290: #define SIMPLEQ_INSERT_TAIL(head, elm, field) do { \
! 291: (elm)->field.sqe_next = NULL; \
! 292: *(head)->sqh_last = (elm); \
! 293: (head)->sqh_last = &(elm)->field.sqe_next; \
! 294: } while (0)
! 295:
! 296: #define SIMPLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
! 297: if (((elm)->field.sqe_next = (listelm)->field.sqe_next) == NULL)\
! 298: (head)->sqh_last = &(elm)->field.sqe_next; \
! 299: (listelm)->field.sqe_next = (elm); \
! 300: } while (0)
! 301:
! 302: #define SIMPLEQ_REMOVE_HEAD(head, field) do { \
! 303: if (((head)->sqh_first = (head)->sqh_first->field.sqe_next) == NULL) \
! 304: (head)->sqh_last = &(head)->sqh_first; \
! 305: } while (0)
! 306:
! 307: /*
! 308: * Tail queue definitions.
! 309: */
! 310: #define TAILQ_HEAD(name, type) \
! 311: struct name { \
! 312: struct type *tqh_first; /* first element */ \
! 313: struct type **tqh_last; /* addr of last next element */ \
! 314: }
! 315:
! 316: #define TAILQ_HEAD_INITIALIZER(head) \
! 317: { NULL, &(head).tqh_first }
! 318:
! 319: #define TAILQ_ENTRY(type) \
! 320: struct { \
! 321: struct type *tqe_next; /* next element */ \
! 322: struct type **tqe_prev; /* address of previous next element */ \
! 323: }
! 324:
! 325: /*
! 326: * tail queue access methods
! 327: */
! 328: #define TAILQ_FIRST(head) ((head)->tqh_first)
! 329: #define TAILQ_END(head) NULL
! 330: #define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
! 331: #define TAILQ_LAST(head, headname) \
! 332: (*(((struct headname *)((head)->tqh_last))->tqh_last))
! 333: /* XXX */
! 334: #define TAILQ_PREV(elm, headname, field) \
! 335: (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
! 336: #define TAILQ_EMPTY(head) \
! 337: (TAILQ_FIRST(head) == TAILQ_END(head))
! 338:
! 339: #define TAILQ_FOREACH(var, head, field) \
! 340: for((var) = TAILQ_FIRST(head); \
! 341: (var) != TAILQ_END(head); \
! 342: (var) = TAILQ_NEXT(var, field))
! 343:
! 344: #define TAILQ_FOREACH_REVERSE(var, head, headname, field) \
! 345: for((var) = TAILQ_LAST(head, headname); \
! 346: (var) != TAILQ_END(head); \
! 347: (var) = TAILQ_PREV(var, headname, field))
! 348:
! 349: /*
! 350: * Tail queue functions.
! 351: */
! 352: #define TAILQ_INIT(head) do { \
! 353: (head)->tqh_first = NULL; \
! 354: (head)->tqh_last = &(head)->tqh_first; \
! 355: } while (0)
! 356:
! 357: #define TAILQ_INSERT_HEAD(head, elm, field) do { \
! 358: if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
! 359: (head)->tqh_first->field.tqe_prev = \
! 360: &(elm)->field.tqe_next; \
! 361: else \
! 362: (head)->tqh_last = &(elm)->field.tqe_next; \
! 363: (head)->tqh_first = (elm); \
! 364: (elm)->field.tqe_prev = &(head)->tqh_first; \
! 365: } while (0)
! 366:
! 367: #define TAILQ_INSERT_TAIL(head, elm, field) do { \
! 368: (elm)->field.tqe_next = NULL; \
! 369: (elm)->field.tqe_prev = (head)->tqh_last; \
! 370: *(head)->tqh_last = (elm); \
! 371: (head)->tqh_last = &(elm)->field.tqe_next; \
! 372: } while (0)
! 373:
! 374: #define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
! 375: if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
! 376: (elm)->field.tqe_next->field.tqe_prev = \
! 377: &(elm)->field.tqe_next; \
! 378: else \
! 379: (head)->tqh_last = &(elm)->field.tqe_next; \
! 380: (listelm)->field.tqe_next = (elm); \
! 381: (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
! 382: } while (0)
! 383:
! 384: #define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
! 385: (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
! 386: (elm)->field.tqe_next = (listelm); \
! 387: *(listelm)->field.tqe_prev = (elm); \
! 388: (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \
! 389: } while (0)
! 390:
! 391: #define TAILQ_REMOVE(head, elm, field) do { \
! 392: if (((elm)->field.tqe_next) != NULL) \
! 393: (elm)->field.tqe_next->field.tqe_prev = \
! 394: (elm)->field.tqe_prev; \
! 395: else \
! 396: (head)->tqh_last = (elm)->field.tqe_prev; \
! 397: *(elm)->field.tqe_prev = (elm)->field.tqe_next; \
! 398: _Q_INVALIDATE((elm)->field.tqe_prev); \
! 399: _Q_INVALIDATE((elm)->field.tqe_next); \
! 400: } while (0)
! 401:
! 402: #define TAILQ_REPLACE(head, elm, elm2, field) do { \
! 403: if (((elm2)->field.tqe_next = (elm)->field.tqe_next) != NULL) \
! 404: (elm2)->field.tqe_next->field.tqe_prev = \
! 405: &(elm2)->field.tqe_next; \
! 406: else \
! 407: (head)->tqh_last = &(elm2)->field.tqe_next; \
! 408: (elm2)->field.tqe_prev = (elm)->field.tqe_prev; \
! 409: *(elm2)->field.tqe_prev = (elm2); \
! 410: _Q_INVALIDATE((elm)->field.tqe_prev); \
! 411: _Q_INVALIDATE((elm)->field.tqe_next); \
! 412: } while (0)
! 413:
! 414: /*
! 415: * Circular queue definitions.
! 416: */
! 417: #define CIRCLEQ_HEAD(name, type) \
! 418: struct name { \
! 419: struct type *cqh_first; /* first element */ \
! 420: struct type *cqh_last; /* last element */ \
! 421: }
! 422:
! 423: #define CIRCLEQ_HEAD_INITIALIZER(head) \
! 424: { CIRCLEQ_END(&head), CIRCLEQ_END(&head) }
! 425:
! 426: #define CIRCLEQ_ENTRY(type) \
! 427: struct { \
! 428: struct type *cqe_next; /* next element */ \
! 429: struct type *cqe_prev; /* previous element */ \
! 430: }
! 431:
! 432: /*
! 433: * Circular queue access methods
! 434: */
! 435: #define CIRCLEQ_FIRST(head) ((head)->cqh_first)
! 436: #define CIRCLEQ_LAST(head) ((head)->cqh_last)
! 437: #define CIRCLEQ_END(head) ((void *)(head))
! 438: #define CIRCLEQ_NEXT(elm, field) ((elm)->field.cqe_next)
! 439: #define CIRCLEQ_PREV(elm, field) ((elm)->field.cqe_prev)
! 440: #define CIRCLEQ_EMPTY(head) \
! 441: (CIRCLEQ_FIRST(head) == CIRCLEQ_END(head))
! 442:
! 443: #define CIRCLEQ_FOREACH(var, head, field) \
! 444: for((var) = CIRCLEQ_FIRST(head); \
! 445: (var) != CIRCLEQ_END(head); \
! 446: (var) = CIRCLEQ_NEXT(var, field))
! 447:
! 448: #define CIRCLEQ_FOREACH_REVERSE(var, head, field) \
! 449: for((var) = CIRCLEQ_LAST(head); \
! 450: (var) != CIRCLEQ_END(head); \
! 451: (var) = CIRCLEQ_PREV(var, field))
! 452:
! 453: /*
! 454: * Circular queue functions.
! 455: */
! 456: #define CIRCLEQ_INIT(head) do { \
! 457: (head)->cqh_first = CIRCLEQ_END(head); \
! 458: (head)->cqh_last = CIRCLEQ_END(head); \
! 459: } while (0)
! 460:
! 461: #define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
! 462: (elm)->field.cqe_next = (listelm)->field.cqe_next; \
! 463: (elm)->field.cqe_prev = (listelm); \
! 464: if ((listelm)->field.cqe_next == CIRCLEQ_END(head)) \
! 465: (head)->cqh_last = (elm); \
! 466: else \
! 467: (listelm)->field.cqe_next->field.cqe_prev = (elm); \
! 468: (listelm)->field.cqe_next = (elm); \
! 469: } while (0)
! 470:
! 471: #define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \
! 472: (elm)->field.cqe_next = (listelm); \
! 473: (elm)->field.cqe_prev = (listelm)->field.cqe_prev; \
! 474: if ((listelm)->field.cqe_prev == CIRCLEQ_END(head)) \
! 475: (head)->cqh_first = (elm); \
! 476: else \
! 477: (listelm)->field.cqe_prev->field.cqe_next = (elm); \
! 478: (listelm)->field.cqe_prev = (elm); \
! 479: } while (0)
! 480:
! 481: #define CIRCLEQ_INSERT_HEAD(head, elm, field) do { \
! 482: (elm)->field.cqe_next = (head)->cqh_first; \
! 483: (elm)->field.cqe_prev = CIRCLEQ_END(head); \
! 484: if ((head)->cqh_last == CIRCLEQ_END(head)) \
! 485: (head)->cqh_last = (elm); \
! 486: else \
! 487: (head)->cqh_first->field.cqe_prev = (elm); \
! 488: (head)->cqh_first = (elm); \
! 489: } while (0)
! 490:
! 491: #define CIRCLEQ_INSERT_TAIL(head, elm, field) do { \
! 492: (elm)->field.cqe_next = CIRCLEQ_END(head); \
! 493: (elm)->field.cqe_prev = (head)->cqh_last; \
! 494: if ((head)->cqh_first == CIRCLEQ_END(head)) \
! 495: (head)->cqh_first = (elm); \
! 496: else \
! 497: (head)->cqh_last->field.cqe_next = (elm); \
! 498: (head)->cqh_last = (elm); \
! 499: } while (0)
! 500:
! 501: #define CIRCLEQ_REMOVE(head, elm, field) do { \
! 502: if ((elm)->field.cqe_next == CIRCLEQ_END(head)) \
! 503: (head)->cqh_last = (elm)->field.cqe_prev; \
! 504: else \
! 505: (elm)->field.cqe_next->field.cqe_prev = \
! 506: (elm)->field.cqe_prev; \
! 507: if ((elm)->field.cqe_prev == CIRCLEQ_END(head)) \
! 508: (head)->cqh_first = (elm)->field.cqe_next; \
! 509: else \
! 510: (elm)->field.cqe_prev->field.cqe_next = \
! 511: (elm)->field.cqe_next; \
! 512: _Q_INVALIDATE((elm)->field.cqe_prev); \
! 513: _Q_INVALIDATE((elm)->field.cqe_next); \
! 514: } while (0)
! 515:
! 516: #define CIRCLEQ_REPLACE(head, elm, elm2, field) do { \
! 517: if (((elm2)->field.cqe_next = (elm)->field.cqe_next) == \
! 518: CIRCLEQ_END(head)) \
! 519: (head).cqh_last = (elm2); \
! 520: else \
! 521: (elm2)->field.cqe_next->field.cqe_prev = (elm2); \
! 522: if (((elm2)->field.cqe_prev = (elm)->field.cqe_prev) == \
! 523: CIRCLEQ_END(head)) \
! 524: (head).cqh_first = (elm2); \
! 525: else \
! 526: (elm2)->field.cqe_prev->field.cqe_next = (elm2); \
! 527: _Q_INVALIDATE((elm)->field.cqe_prev); \
! 528: _Q_INVALIDATE((elm)->field.cqe_next); \
! 529: } while (0)
! 530:
! 531: #endif /* !_SYS_QUEUE_H_ */
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