Annotation of embedaddon/tmux/compat/queue.h, revision 1.1
1.1 ! misho 1: /* $OpenBSD: queue.h,v 1.44 2016/09/09 20:31:46 millert 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 XOR simple 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 to 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: * An XOR simple queue is used in the same way as a regular simple queue.
! 75: * The difference is that the head structure also includes a "cookie" that
! 76: * is XOR'd with the queue pointer (first, last or next) to generate the
! 77: * real pointer value.
! 78: *
! 79: * For details on the use of these macros, see the queue(3) manual page.
! 80: */
! 81:
! 82: #if defined(QUEUE_MACRO_DEBUG) || (defined(_KERNEL) && defined(DIAGNOSTIC))
! 83: #define _Q_INVALIDATE(a) (a) = ((void *)-1)
! 84: #else
! 85: #define _Q_INVALIDATE(a)
! 86: #endif
! 87:
! 88: /*
! 89: * Singly-linked List definitions.
! 90: */
! 91: #define SLIST_HEAD(name, type) \
! 92: struct name { \
! 93: struct type *slh_first; /* first element */ \
! 94: }
! 95:
! 96: #define SLIST_HEAD_INITIALIZER(head) \
! 97: { NULL }
! 98:
! 99: #define SLIST_ENTRY(type) \
! 100: struct { \
! 101: struct type *sle_next; /* next element */ \
! 102: }
! 103:
! 104: /*
! 105: * Singly-linked List access methods.
! 106: */
! 107: #define SLIST_FIRST(head) ((head)->slh_first)
! 108: #define SLIST_END(head) NULL
! 109: #define SLIST_EMPTY(head) (SLIST_FIRST(head) == SLIST_END(head))
! 110: #define SLIST_NEXT(elm, field) ((elm)->field.sle_next)
! 111:
! 112: #define SLIST_FOREACH(var, head, field) \
! 113: for((var) = SLIST_FIRST(head); \
! 114: (var) != SLIST_END(head); \
! 115: (var) = SLIST_NEXT(var, field))
! 116:
! 117: #define SLIST_FOREACH_SAFE(var, head, field, tvar) \
! 118: for ((var) = SLIST_FIRST(head); \
! 119: (var) && ((tvar) = SLIST_NEXT(var, field), 1); \
! 120: (var) = (tvar))
! 121:
! 122: /*
! 123: * Singly-linked List functions.
! 124: */
! 125: #define SLIST_INIT(head) { \
! 126: SLIST_FIRST(head) = SLIST_END(head); \
! 127: }
! 128:
! 129: #define SLIST_INSERT_AFTER(slistelm, elm, field) do { \
! 130: (elm)->field.sle_next = (slistelm)->field.sle_next; \
! 131: (slistelm)->field.sle_next = (elm); \
! 132: } while (0)
! 133:
! 134: #define SLIST_INSERT_HEAD(head, elm, field) do { \
! 135: (elm)->field.sle_next = (head)->slh_first; \
! 136: (head)->slh_first = (elm); \
! 137: } while (0)
! 138:
! 139: #define SLIST_REMOVE_AFTER(elm, field) do { \
! 140: (elm)->field.sle_next = (elm)->field.sle_next->field.sle_next; \
! 141: } while (0)
! 142:
! 143: #define SLIST_REMOVE_HEAD(head, field) do { \
! 144: (head)->slh_first = (head)->slh_first->field.sle_next; \
! 145: } while (0)
! 146:
! 147: #define SLIST_REMOVE(head, elm, type, field) do { \
! 148: if ((head)->slh_first == (elm)) { \
! 149: SLIST_REMOVE_HEAD((head), field); \
! 150: } else { \
! 151: struct type *curelm = (head)->slh_first; \
! 152: \
! 153: while (curelm->field.sle_next != (elm)) \
! 154: curelm = curelm->field.sle_next; \
! 155: curelm->field.sle_next = \
! 156: curelm->field.sle_next->field.sle_next; \
! 157: } \
! 158: _Q_INVALIDATE((elm)->field.sle_next); \
! 159: } while (0)
! 160:
! 161: /*
! 162: * List definitions.
! 163: */
! 164: #define LIST_HEAD(name, type) \
! 165: struct name { \
! 166: struct type *lh_first; /* first element */ \
! 167: }
! 168:
! 169: #define LIST_HEAD_INITIALIZER(head) \
! 170: { NULL }
! 171:
! 172: #define LIST_ENTRY(type) \
! 173: struct { \
! 174: struct type *le_next; /* next element */ \
! 175: struct type **le_prev; /* address of previous next element */ \
! 176: }
! 177:
! 178: /*
! 179: * List access methods.
! 180: */
! 181: #define LIST_FIRST(head) ((head)->lh_first)
! 182: #define LIST_END(head) NULL
! 183: #define LIST_EMPTY(head) (LIST_FIRST(head) == LIST_END(head))
! 184: #define LIST_NEXT(elm, field) ((elm)->field.le_next)
! 185:
! 186: #define LIST_FOREACH(var, head, field) \
! 187: for((var) = LIST_FIRST(head); \
! 188: (var)!= LIST_END(head); \
! 189: (var) = LIST_NEXT(var, field))
! 190:
! 191: #define LIST_FOREACH_SAFE(var, head, field, tvar) \
! 192: for ((var) = LIST_FIRST(head); \
! 193: (var) && ((tvar) = LIST_NEXT(var, field), 1); \
! 194: (var) = (tvar))
! 195:
! 196: /*
! 197: * List functions.
! 198: */
! 199: #define LIST_INIT(head) do { \
! 200: LIST_FIRST(head) = LIST_END(head); \
! 201: } while (0)
! 202:
! 203: #define LIST_INSERT_AFTER(listelm, elm, field) do { \
! 204: if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \
! 205: (listelm)->field.le_next->field.le_prev = \
! 206: &(elm)->field.le_next; \
! 207: (listelm)->field.le_next = (elm); \
! 208: (elm)->field.le_prev = &(listelm)->field.le_next; \
! 209: } while (0)
! 210:
! 211: #define LIST_INSERT_BEFORE(listelm, elm, field) do { \
! 212: (elm)->field.le_prev = (listelm)->field.le_prev; \
! 213: (elm)->field.le_next = (listelm); \
! 214: *(listelm)->field.le_prev = (elm); \
! 215: (listelm)->field.le_prev = &(elm)->field.le_next; \
! 216: } while (0)
! 217:
! 218: #define LIST_INSERT_HEAD(head, elm, field) do { \
! 219: if (((elm)->field.le_next = (head)->lh_first) != NULL) \
! 220: (head)->lh_first->field.le_prev = &(elm)->field.le_next;\
! 221: (head)->lh_first = (elm); \
! 222: (elm)->field.le_prev = &(head)->lh_first; \
! 223: } while (0)
! 224:
! 225: #define LIST_REMOVE(elm, field) do { \
! 226: if ((elm)->field.le_next != NULL) \
! 227: (elm)->field.le_next->field.le_prev = \
! 228: (elm)->field.le_prev; \
! 229: *(elm)->field.le_prev = (elm)->field.le_next; \
! 230: _Q_INVALIDATE((elm)->field.le_prev); \
! 231: _Q_INVALIDATE((elm)->field.le_next); \
! 232: } while (0)
! 233:
! 234: #define LIST_REPLACE(elm, elm2, field) do { \
! 235: if (((elm2)->field.le_next = (elm)->field.le_next) != NULL) \
! 236: (elm2)->field.le_next->field.le_prev = \
! 237: &(elm2)->field.le_next; \
! 238: (elm2)->field.le_prev = (elm)->field.le_prev; \
! 239: *(elm2)->field.le_prev = (elm2); \
! 240: _Q_INVALIDATE((elm)->field.le_prev); \
! 241: _Q_INVALIDATE((elm)->field.le_next); \
! 242: } while (0)
! 243:
! 244: /*
! 245: * Simple queue definitions.
! 246: */
! 247: #define SIMPLEQ_HEAD(name, type) \
! 248: struct name { \
! 249: struct type *sqh_first; /* first element */ \
! 250: struct type **sqh_last; /* addr of last next element */ \
! 251: }
! 252:
! 253: #define SIMPLEQ_HEAD_INITIALIZER(head) \
! 254: { NULL, &(head).sqh_first }
! 255:
! 256: #define SIMPLEQ_ENTRY(type) \
! 257: struct { \
! 258: struct type *sqe_next; /* next element */ \
! 259: }
! 260:
! 261: /*
! 262: * Simple queue access methods.
! 263: */
! 264: #define SIMPLEQ_FIRST(head) ((head)->sqh_first)
! 265: #define SIMPLEQ_END(head) NULL
! 266: #define SIMPLEQ_EMPTY(head) (SIMPLEQ_FIRST(head) == SIMPLEQ_END(head))
! 267: #define SIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next)
! 268:
! 269: #define SIMPLEQ_FOREACH(var, head, field) \
! 270: for((var) = SIMPLEQ_FIRST(head); \
! 271: (var) != SIMPLEQ_END(head); \
! 272: (var) = SIMPLEQ_NEXT(var, field))
! 273:
! 274: #define SIMPLEQ_FOREACH_SAFE(var, head, field, tvar) \
! 275: for ((var) = SIMPLEQ_FIRST(head); \
! 276: (var) && ((tvar) = SIMPLEQ_NEXT(var, field), 1); \
! 277: (var) = (tvar))
! 278:
! 279: /*
! 280: * Simple queue functions.
! 281: */
! 282: #define SIMPLEQ_INIT(head) do { \
! 283: (head)->sqh_first = NULL; \
! 284: (head)->sqh_last = &(head)->sqh_first; \
! 285: } while (0)
! 286:
! 287: #define SIMPLEQ_INSERT_HEAD(head, elm, field) do { \
! 288: if (((elm)->field.sqe_next = (head)->sqh_first) == NULL) \
! 289: (head)->sqh_last = &(elm)->field.sqe_next; \
! 290: (head)->sqh_first = (elm); \
! 291: } while (0)
! 292:
! 293: #define SIMPLEQ_INSERT_TAIL(head, elm, field) do { \
! 294: (elm)->field.sqe_next = NULL; \
! 295: *(head)->sqh_last = (elm); \
! 296: (head)->sqh_last = &(elm)->field.sqe_next; \
! 297: } while (0)
! 298:
! 299: #define SIMPLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
! 300: if (((elm)->field.sqe_next = (listelm)->field.sqe_next) == NULL)\
! 301: (head)->sqh_last = &(elm)->field.sqe_next; \
! 302: (listelm)->field.sqe_next = (elm); \
! 303: } while (0)
! 304:
! 305: #define SIMPLEQ_REMOVE_HEAD(head, field) do { \
! 306: if (((head)->sqh_first = (head)->sqh_first->field.sqe_next) == NULL) \
! 307: (head)->sqh_last = &(head)->sqh_first; \
! 308: } while (0)
! 309:
! 310: #define SIMPLEQ_REMOVE_AFTER(head, elm, field) do { \
! 311: if (((elm)->field.sqe_next = (elm)->field.sqe_next->field.sqe_next) \
! 312: == NULL) \
! 313: (head)->sqh_last = &(elm)->field.sqe_next; \
! 314: } while (0)
! 315:
! 316: #define SIMPLEQ_CONCAT(head1, head2) do { \
! 317: if (!SIMPLEQ_EMPTY((head2))) { \
! 318: *(head1)->sqh_last = (head2)->sqh_first; \
! 319: (head1)->sqh_last = (head2)->sqh_last; \
! 320: SIMPLEQ_INIT((head2)); \
! 321: } \
! 322: } while (0)
! 323:
! 324: /*
! 325: * XOR Simple queue definitions.
! 326: */
! 327: #define XSIMPLEQ_HEAD(name, type) \
! 328: struct name { \
! 329: struct type *sqx_first; /* first element */ \
! 330: struct type **sqx_last; /* addr of last next element */ \
! 331: unsigned long sqx_cookie; \
! 332: }
! 333:
! 334: #define XSIMPLEQ_ENTRY(type) \
! 335: struct { \
! 336: struct type *sqx_next; /* next element */ \
! 337: }
! 338:
! 339: /*
! 340: * XOR Simple queue access methods.
! 341: */
! 342: #define XSIMPLEQ_XOR(head, ptr) ((__typeof(ptr))((head)->sqx_cookie ^ \
! 343: (unsigned long)(ptr)))
! 344: #define XSIMPLEQ_FIRST(head) XSIMPLEQ_XOR(head, ((head)->sqx_first))
! 345: #define XSIMPLEQ_END(head) NULL
! 346: #define XSIMPLEQ_EMPTY(head) (XSIMPLEQ_FIRST(head) == XSIMPLEQ_END(head))
! 347: #define XSIMPLEQ_NEXT(head, elm, field) XSIMPLEQ_XOR(head, ((elm)->field.sqx_next))
! 348:
! 349:
! 350: #define XSIMPLEQ_FOREACH(var, head, field) \
! 351: for ((var) = XSIMPLEQ_FIRST(head); \
! 352: (var) != XSIMPLEQ_END(head); \
! 353: (var) = XSIMPLEQ_NEXT(head, var, field))
! 354:
! 355: #define XSIMPLEQ_FOREACH_SAFE(var, head, field, tvar) \
! 356: for ((var) = XSIMPLEQ_FIRST(head); \
! 357: (var) && ((tvar) = XSIMPLEQ_NEXT(head, var, field), 1); \
! 358: (var) = (tvar))
! 359:
! 360: /*
! 361: * XOR Simple queue functions.
! 362: */
! 363: #define XSIMPLEQ_INIT(head) do { \
! 364: arc4random_buf(&(head)->sqx_cookie, sizeof((head)->sqx_cookie)); \
! 365: (head)->sqx_first = XSIMPLEQ_XOR(head, NULL); \
! 366: (head)->sqx_last = XSIMPLEQ_XOR(head, &(head)->sqx_first); \
! 367: } while (0)
! 368:
! 369: #define XSIMPLEQ_INSERT_HEAD(head, elm, field) do { \
! 370: if (((elm)->field.sqx_next = (head)->sqx_first) == \
! 371: XSIMPLEQ_XOR(head, NULL)) \
! 372: (head)->sqx_last = XSIMPLEQ_XOR(head, &(elm)->field.sqx_next); \
! 373: (head)->sqx_first = XSIMPLEQ_XOR(head, (elm)); \
! 374: } while (0)
! 375:
! 376: #define XSIMPLEQ_INSERT_TAIL(head, elm, field) do { \
! 377: (elm)->field.sqx_next = XSIMPLEQ_XOR(head, NULL); \
! 378: *(XSIMPLEQ_XOR(head, (head)->sqx_last)) = XSIMPLEQ_XOR(head, (elm)); \
! 379: (head)->sqx_last = XSIMPLEQ_XOR(head, &(elm)->field.sqx_next); \
! 380: } while (0)
! 381:
! 382: #define XSIMPLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
! 383: if (((elm)->field.sqx_next = (listelm)->field.sqx_next) == \
! 384: XSIMPLEQ_XOR(head, NULL)) \
! 385: (head)->sqx_last = XSIMPLEQ_XOR(head, &(elm)->field.sqx_next); \
! 386: (listelm)->field.sqx_next = XSIMPLEQ_XOR(head, (elm)); \
! 387: } while (0)
! 388:
! 389: #define XSIMPLEQ_REMOVE_HEAD(head, field) do { \
! 390: if (((head)->sqx_first = XSIMPLEQ_XOR(head, \
! 391: (head)->sqx_first)->field.sqx_next) == XSIMPLEQ_XOR(head, NULL)) \
! 392: (head)->sqx_last = XSIMPLEQ_XOR(head, &(head)->sqx_first); \
! 393: } while (0)
! 394:
! 395: #define XSIMPLEQ_REMOVE_AFTER(head, elm, field) do { \
! 396: if (((elm)->field.sqx_next = XSIMPLEQ_XOR(head, \
! 397: (elm)->field.sqx_next)->field.sqx_next) \
! 398: == XSIMPLEQ_XOR(head, NULL)) \
! 399: (head)->sqx_last = \
! 400: XSIMPLEQ_XOR(head, &(elm)->field.sqx_next); \
! 401: } while (0)
! 402:
! 403:
! 404: /*
! 405: * Tail queue definitions.
! 406: */
! 407: #define TAILQ_HEAD(name, type) \
! 408: struct name { \
! 409: struct type *tqh_first; /* first element */ \
! 410: struct type **tqh_last; /* addr of last next element */ \
! 411: }
! 412:
! 413: #define TAILQ_HEAD_INITIALIZER(head) \
! 414: { NULL, &(head).tqh_first }
! 415:
! 416: #define TAILQ_ENTRY(type) \
! 417: struct { \
! 418: struct type *tqe_next; /* next element */ \
! 419: struct type **tqe_prev; /* address of previous next element */ \
! 420: }
! 421:
! 422: /*
! 423: * Tail queue access methods.
! 424: */
! 425: #define TAILQ_FIRST(head) ((head)->tqh_first)
! 426: #define TAILQ_END(head) NULL
! 427: #define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
! 428: #define TAILQ_LAST(head, headname) \
! 429: (*(((struct headname *)((head)->tqh_last))->tqh_last))
! 430: /* XXX */
! 431: #define TAILQ_PREV(elm, headname, field) \
! 432: (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
! 433: #define TAILQ_EMPTY(head) \
! 434: (TAILQ_FIRST(head) == TAILQ_END(head))
! 435:
! 436: #define TAILQ_FOREACH(var, head, field) \
! 437: for((var) = TAILQ_FIRST(head); \
! 438: (var) != TAILQ_END(head); \
! 439: (var) = TAILQ_NEXT(var, field))
! 440:
! 441: #define TAILQ_FOREACH_SAFE(var, head, field, tvar) \
! 442: for ((var) = TAILQ_FIRST(head); \
! 443: (var) != TAILQ_END(head) && \
! 444: ((tvar) = TAILQ_NEXT(var, field), 1); \
! 445: (var) = (tvar))
! 446:
! 447:
! 448: #define TAILQ_FOREACH_REVERSE(var, head, headname, field) \
! 449: for((var) = TAILQ_LAST(head, headname); \
! 450: (var) != TAILQ_END(head); \
! 451: (var) = TAILQ_PREV(var, headname, field))
! 452:
! 453: #define TAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, tvar) \
! 454: for ((var) = TAILQ_LAST(head, headname); \
! 455: (var) != TAILQ_END(head) && \
! 456: ((tvar) = TAILQ_PREV(var, headname, field), 1); \
! 457: (var) = (tvar))
! 458:
! 459: /*
! 460: * Tail queue functions.
! 461: */
! 462: #define TAILQ_INIT(head) do { \
! 463: (head)->tqh_first = NULL; \
! 464: (head)->tqh_last = &(head)->tqh_first; \
! 465: } while (0)
! 466:
! 467: #define TAILQ_INSERT_HEAD(head, elm, field) do { \
! 468: if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
! 469: (head)->tqh_first->field.tqe_prev = \
! 470: &(elm)->field.tqe_next; \
! 471: else \
! 472: (head)->tqh_last = &(elm)->field.tqe_next; \
! 473: (head)->tqh_first = (elm); \
! 474: (elm)->field.tqe_prev = &(head)->tqh_first; \
! 475: } while (0)
! 476:
! 477: #define TAILQ_INSERT_TAIL(head, elm, field) do { \
! 478: (elm)->field.tqe_next = NULL; \
! 479: (elm)->field.tqe_prev = (head)->tqh_last; \
! 480: *(head)->tqh_last = (elm); \
! 481: (head)->tqh_last = &(elm)->field.tqe_next; \
! 482: } while (0)
! 483:
! 484: #define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
! 485: if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
! 486: (elm)->field.tqe_next->field.tqe_prev = \
! 487: &(elm)->field.tqe_next; \
! 488: else \
! 489: (head)->tqh_last = &(elm)->field.tqe_next; \
! 490: (listelm)->field.tqe_next = (elm); \
! 491: (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
! 492: } while (0)
! 493:
! 494: #define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
! 495: (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
! 496: (elm)->field.tqe_next = (listelm); \
! 497: *(listelm)->field.tqe_prev = (elm); \
! 498: (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \
! 499: } while (0)
! 500:
! 501: #define TAILQ_REMOVE(head, elm, field) do { \
! 502: if (((elm)->field.tqe_next) != NULL) \
! 503: (elm)->field.tqe_next->field.tqe_prev = \
! 504: (elm)->field.tqe_prev; \
! 505: else \
! 506: (head)->tqh_last = (elm)->field.tqe_prev; \
! 507: *(elm)->field.tqe_prev = (elm)->field.tqe_next; \
! 508: _Q_INVALIDATE((elm)->field.tqe_prev); \
! 509: _Q_INVALIDATE((elm)->field.tqe_next); \
! 510: } while (0)
! 511:
! 512: #define TAILQ_REPLACE(head, elm, elm2, field) do { \
! 513: if (((elm2)->field.tqe_next = (elm)->field.tqe_next) != NULL) \
! 514: (elm2)->field.tqe_next->field.tqe_prev = \
! 515: &(elm2)->field.tqe_next; \
! 516: else \
! 517: (head)->tqh_last = &(elm2)->field.tqe_next; \
! 518: (elm2)->field.tqe_prev = (elm)->field.tqe_prev; \
! 519: *(elm2)->field.tqe_prev = (elm2); \
! 520: _Q_INVALIDATE((elm)->field.tqe_prev); \
! 521: _Q_INVALIDATE((elm)->field.tqe_next); \
! 522: } while (0)
! 523:
! 524: #define TAILQ_CONCAT(head1, head2, field) do { \
! 525: if (!TAILQ_EMPTY(head2)) { \
! 526: *(head1)->tqh_last = (head2)->tqh_first; \
! 527: (head2)->tqh_first->field.tqe_prev = (head1)->tqh_last; \
! 528: (head1)->tqh_last = (head2)->tqh_last; \
! 529: TAILQ_INIT((head2)); \
! 530: } \
! 531: } while (0)
! 532:
! 533: #endif /* !_SYS_QUEUE_H_ */
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