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