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346 lines
12 KiB
C
346 lines
12 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996-2004
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* Sleepycat Software. All rights reserved.
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*
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* $Id: shqueue.h,v 11.15 2004/03/24 20:37:37 bostic Exp $
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*/
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#ifndef _SYS_SHQUEUE_H_
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#define _SYS_SHQUEUE_H_
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/*
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* This file defines two types of data structures: lists and tail queues
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* similarly to the include file <sys/queue.h>.
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*
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* The difference is that this set of macros can be used for structures that
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* reside in shared memory that may be mapped at different addresses in each
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* process. In most cases, the macros for shared structures exactly mirror
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* the normal macros, although the macro calls require an additional type
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* parameter, only used by the HEAD and ENTRY macros of the standard macros.
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*
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* Since we use relative offsets of type ssize_t rather than pointers, 0
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* (aka NULL) is a valid offset and cannot be used to indicate the end
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* of a list. Therefore, we use -1 to indicate end of list.
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*
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* The macros ending in "P" return pointers without checking for end or
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* beginning of lists, the others check for end of list and evaluate to
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* either a pointer or NULL.
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*
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* For details on the use of these macros, see the queue(3) manual page.
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*/
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/*
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* Shared memory list definitions.
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*/
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#define SH_LIST_HEAD(name) \
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struct name { \
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ssize_t slh_first; /* first element */ \
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}
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#define SH_LIST_HEAD_INITIALIZER(head) \
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{ -1 }
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#define SH_LIST_ENTRY \
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struct { \
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ssize_t sle_next; /* relative offset to next element */ \
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ssize_t sle_prev; /* relative offset of prev element */ \
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}
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/*
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* Shared memory list functions.
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*/
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#define SH_LIST_EMPTY(head) \
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((head)->slh_first == -1)
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#define SH_LIST_FIRSTP(head, type) \
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((struct type *)(((u_int8_t *)(head)) + (head)->slh_first))
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#define SH_LIST_FIRST(head, type) \
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(SH_LIST_EMPTY(head) ? NULL : \
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((struct type *)(((u_int8_t *)(head)) + (head)->slh_first)))
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#define SH_LIST_NEXTP(elm, field, type) \
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((struct type *)(((u_int8_t *)(elm)) + (elm)->field.sle_next))
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#define SH_LIST_NEXT(elm, field, type) \
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((elm)->field.sle_next == -1 ? NULL : \
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((struct type *)(((u_int8_t *)(elm)) + (elm)->field.sle_next)))
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/*
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*__SH_LIST_PREV_OFF is private API. It calculates the address of
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* the elm->field.sle_next member of a SH_LIST structure. All offsets
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* between elements are relative to that point in SH_LIST structures.
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*/
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#define __SH_LIST_PREV_OFF(elm, field) \
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((ssize_t *)(((u_int8_t *)(elm)) + (elm)->field.sle_prev))
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#define SH_LIST_PREV(elm, field, type) \
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(struct type *)((ssize_t)elm - (*__SH_LIST_PREV_OFF(elm, field)))
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#define SH_LIST_FOREACH(var, head, field, type) \
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for ((var) = SH_LIST_FIRST((head), type); \
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(var); \
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(var) = SH_LIST_NEXT((var), field, type))
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#define SH_PTR_TO_OFF(src, dest) \
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((ssize_t)(((u_int8_t *)(dest)) - ((u_int8_t *)(src))))
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/*
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* Given correct A.next: B.prev = SH_LIST_NEXT_TO_PREV(A)
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* in a list [A, B]
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* The prev value is always the offset from an element to its preceding
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* element's next location, not the beginning of the structure. To get
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* to the beginning of an element structure in memory given an element
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* do the following:
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* A = B - (B.prev + (&B.next - B))
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* Take the element's next pointer and calculate what the corresponding
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* Prev pointer should be -- basically it is the negation plus the offset
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* of the next field in the structure.
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*/
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#define SH_LIST_NEXT_TO_PREV(elm, field) \
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(((elm)->field.sle_next == -1 ? 0 : -(elm)->field.sle_next) + \
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SH_PTR_TO_OFF(elm, &(elm)->field.sle_next))
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#define SH_LIST_INIT(head) (head)->slh_first = -1
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#define SH_LIST_INSERT_BEFORE(head, listelm, elm, field, type) do { \
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if (listelm == SH_LIST_FIRST(head, type)) { \
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SH_LIST_INSERT_HEAD(head, elm, field, type); \
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} else { \
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(elm)->field.sle_next = SH_PTR_TO_OFF(elm, listelm); \
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(elm)->field.sle_prev = SH_LIST_NEXT_TO_PREV( \
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SH_LIST_PREV((listelm), field, type), field) + \
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(elm)->field.sle_next; \
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(SH_LIST_PREV(listelm, field, type))->field.sle_next = \
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(SH_PTR_TO_OFF((SH_LIST_PREV(listelm, field, \
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type)), elm)); \
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(listelm)->field.sle_prev = SH_LIST_NEXT_TO_PREV(elm, field); \
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} \
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} while (0)
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#define SH_LIST_INSERT_AFTER(listelm, elm, field, type) do { \
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if ((listelm)->field.sle_next != -1) { \
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(elm)->field.sle_next = SH_PTR_TO_OFF(elm, \
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SH_LIST_NEXTP(listelm, field, type)); \
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SH_LIST_NEXTP(listelm, field, type)->field.sle_prev = \
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SH_LIST_NEXT_TO_PREV(elm, field); \
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} else \
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(elm)->field.sle_next = -1; \
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(listelm)->field.sle_next = SH_PTR_TO_OFF(listelm, elm); \
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(elm)->field.sle_prev = SH_LIST_NEXT_TO_PREV(listelm, field); \
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} while (0)
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#define SH_LIST_INSERT_HEAD(head, elm, field, type) do { \
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if ((head)->slh_first != -1) { \
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(elm)->field.sle_next = \
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(head)->slh_first - SH_PTR_TO_OFF(head, elm); \
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SH_LIST_FIRSTP(head, type)->field.sle_prev = \
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SH_LIST_NEXT_TO_PREV(elm, field); \
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} else \
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(elm)->field.sle_next = -1; \
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(head)->slh_first = SH_PTR_TO_OFF(head, elm); \
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(elm)->field.sle_prev = SH_PTR_TO_OFF(elm, &(head)->slh_first); \
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} while (0)
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#define SH_LIST_REMOVE(elm, field, type) do { \
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if ((elm)->field.sle_next != -1) { \
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SH_LIST_NEXTP(elm, field, type)->field.sle_prev = \
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(elm)->field.sle_prev - (elm)->field.sle_next; \
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*__SH_LIST_PREV_OFF(elm, field) += (elm)->field.sle_next;\
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} else \
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*__SH_LIST_PREV_OFF(elm, field) = -1; \
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} while (0)
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#define SH_LIST_REMOVE_HEAD(head, field, type) do { \
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if (!SH_LIST_EMPTY(head)) { \
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SH_LIST_REMOVE(SH_LIST_FIRSTP(head, type), field, type);\
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} \
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} while (0)
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/*
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* Shared memory tail queue definitions.
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*/
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#define SH_TAILQ_HEAD(name) \
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struct name { \
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ssize_t stqh_first; /* relative offset of first element */ \
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ssize_t stqh_last; /* relative offset of last's next */ \
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}
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#define SH_TAILQ_HEAD_INITIALIZER(head) \
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{ -1, 0 }
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#define SH_TAILQ_ENTRY \
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struct { \
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ssize_t stqe_next; /* relative offset of next element */ \
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ssize_t stqe_prev; /* relative offset of prev's next */ \
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}
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/*
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* Shared memory tail queue functions.
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*/
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#define SH_TAILQ_EMPTY(head) \
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((head)->stqh_first == -1)
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#define SH_TAILQ_FIRSTP(head, type) \
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((struct type *)((u_int8_t *)(head) + (head)->stqh_first))
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#define SH_TAILQ_FIRST(head, type) \
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(SH_TAILQ_EMPTY(head) ? NULL : SH_TAILQ_FIRSTP(head, type))
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#define SH_TAILQ_NEXTP(elm, field, type) \
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((struct type *)((u_int8_t *)(elm) + (elm)->field.stqe_next))
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#define SH_TAILQ_NEXT(elm, field, type) \
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((elm)->field.stqe_next == -1 ? NULL : \
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((struct type *)((u_int8_t *)(elm) + (elm)->field.stqe_next)))
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/*
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* __SH_TAILQ_PREV_OFF is private API. It calculates the address of
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* the elm->field.stqe_next member of a SH_TAILQ structure. All
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* offsets between elements are relative to that point in SH_TAILQ
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* structures.
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*/
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#define __SH_TAILQ_PREV_OFF(elm, field) \
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((ssize_t *)(((u_int8_t *)(elm)) + (elm)->field.stqe_prev))
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#define SH_TAILQ_PREVP(elm, field, type) \
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(struct type *)((ssize_t)elm - (*__SH_TAILQ_PREV_OFF(elm, field)))
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#define SH_TAILQ_PREV(head, elm, field, type) \
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(((elm) == SH_TAILQ_FIRST(head, type)) ? NULL : \
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(struct type *)((ssize_t)elm - (*__SH_TAILQ_PREV_OFF(elm, field))))
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/*
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* __SH_TAILQ_LAST_OFF is private API. It calculates the address of
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* the stqe_next member of a SH_TAILQ structure in the last element
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* of this list. All offsets between elements are relative to that
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* point in SH_TAILQ structures.
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*/
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#define __SH_TAILQ_LAST_OFF(head) \
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((ssize_t *)(((u_int8_t *)(head)) + (head)->stqh_last))
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#define SH_TAILQ_LAST(head, field, type) \
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(SH_TAILQ_EMPTY(head) ? NULL : \
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(struct type *)((ssize_t)(head) + \
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((ssize_t)((head)->stqh_last) - \
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((ssize_t)SH_PTR_TO_OFF(SH_TAILQ_FIRST(head, type), \
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&(SH_TAILQ_FIRST(head, type)->field.stqe_next))))))
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/*
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* Given correct A.next: B.prev = SH_TAILQ_NEXT_TO_PREV(A)
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* in a list [A, B]
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* The prev value is always the offset from an element to its preceding
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* element's next location, not the beginning of the structure. To get
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* to the beginning of an element structure in memory given an element
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* do the following:
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* A = B - (B.prev + (&B.next - B))
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*/
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#define SH_TAILQ_NEXT_TO_PREV(elm, field) \
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(((elm)->field.stqe_next == -1 ? 0 : \
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(-(elm)->field.stqe_next) + \
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SH_PTR_TO_OFF(elm, &(elm)->field.stqe_next)))
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#define SH_TAILQ_FOREACH(var, head, field, type) \
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for ((var) = SH_TAILQ_FIRST((head), type); \
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(var); \
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(var) = SH_TAILQ_NEXT((var), field, type))
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#define SH_TAILQ_FOREACH_REVERSE(var, head, field, type) \
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for ((var) = SH_TAILQ_LAST((head), field, type); \
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(var); \
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(var) = SH_TAILQ_PREV((head), (var), field, type))
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#define SH_TAILQ_INIT(head) { \
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(head)->stqh_first = -1; \
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(head)->stqh_last = SH_PTR_TO_OFF(head, &(head)->stqh_first); \
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}
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#define SH_TAILQ_INSERT_HEAD(head, elm, field, type) do { \
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if ((head)->stqh_first != -1) { \
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(elm)->field.stqe_next = \
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(head)->stqh_first - SH_PTR_TO_OFF(head, elm); \
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SH_TAILQ_FIRSTP(head, type)->field.stqe_prev = \
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SH_TAILQ_NEXT_TO_PREV(elm, field); \
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} else { \
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(head)->stqh_last = \
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SH_PTR_TO_OFF(head, &(elm)->field.stqe_next); \
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(elm)->field.stqe_next = -1; \
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} \
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(head)->stqh_first = SH_PTR_TO_OFF(head, elm); \
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(elm)->field.stqe_prev = \
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SH_PTR_TO_OFF(elm, &(head)->stqh_first); \
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} while (0)
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#define SH_TAILQ_INSERT_TAIL(head, elm, field) do { \
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(elm)->field.stqe_next = -1; \
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(elm)->field.stqe_prev = \
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-SH_PTR_TO_OFF(head, elm) + (head)->stqh_last; \
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if ((head)->stqh_last == \
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SH_PTR_TO_OFF((head), &(head)->stqh_first)) \
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(head)->stqh_first = SH_PTR_TO_OFF(head, elm); \
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else \
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*__SH_TAILQ_LAST_OFF(head) = -(head)->stqh_last + \
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SH_PTR_TO_OFF((elm), &(elm)->field.stqe_next) + \
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SH_PTR_TO_OFF(head, elm); \
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(head)->stqh_last = \
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SH_PTR_TO_OFF(head, &((elm)->field.stqe_next)); \
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} while (0)
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#define SH_TAILQ_INSERT_BEFORE(head, listelm, elm, field, type) do { \
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if (listelm == SH_TAILQ_FIRST(head, type)) { \
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SH_TAILQ_INSERT_HEAD(head, elm, field, type); \
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} else { \
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(elm)->field.stqe_next = SH_PTR_TO_OFF(elm, listelm); \
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(elm)->field.stqe_prev = SH_TAILQ_NEXT_TO_PREV( \
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SH_TAILQ_PREVP((listelm), field, type), field) + \
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(elm)->field.stqe_next; \
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(SH_TAILQ_PREVP(listelm, field, type))->field.stqe_next =\
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(SH_PTR_TO_OFF((SH_TAILQ_PREVP(listelm, field, type)), \
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elm)); \
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(listelm)->field.stqe_prev = \
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SH_TAILQ_NEXT_TO_PREV(elm, field); \
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} \
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} while (0)
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#define SH_TAILQ_INSERT_AFTER(head, listelm, elm, field, type) do { \
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if ((listelm)->field.stqe_next != -1) { \
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(elm)->field.stqe_next = (listelm)->field.stqe_next - \
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SH_PTR_TO_OFF(listelm, elm); \
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SH_TAILQ_NEXTP(listelm, field, type)->field.stqe_prev = \
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SH_TAILQ_NEXT_TO_PREV(elm, field); \
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} else { \
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(elm)->field.stqe_next = -1; \
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(head)->stqh_last = \
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SH_PTR_TO_OFF(head, &elm->field.stqe_next); \
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} \
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(listelm)->field.stqe_next = SH_PTR_TO_OFF(listelm, elm); \
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(elm)->field.stqe_prev = SH_TAILQ_NEXT_TO_PREV(listelm, field); \
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} while (0)
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#define SH_TAILQ_REMOVE(head, elm, field, type) do { \
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if ((elm)->field.stqe_next != -1) { \
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SH_TAILQ_NEXTP(elm, field, type)->field.stqe_prev = \
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(elm)->field.stqe_prev + \
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SH_PTR_TO_OFF(SH_TAILQ_NEXTP(elm, \
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field, type), elm); \
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*__SH_TAILQ_PREV_OFF(elm, field) += elm->field.stqe_next;\
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} else { \
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(head)->stqh_last = (elm)->field.stqe_prev + \
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SH_PTR_TO_OFF(head, elm); \
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*__SH_TAILQ_PREV_OFF(elm, field) = -1; \
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} \
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} while (0)
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#if defined(__cplusplus)
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}
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#endif
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#endif /* !_SYS_SHQUEUE_H_ */
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