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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * This code draws heavily from the 4.4BSD <sys/queue.h> macros
+ * and Dean Gaudet's "splim/ring.h".
+ * <http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/sys/queue.h>
+ * <http://www.arctic.org/~dean/splim/>
+ *
+ * We'd use Dean's code directly if we could guarantee the
+ * availability of inline functions.
+ */
+
+#ifndef APR_RING_H
+#define APR_RING_H
+
+/**
+ * @file apr_ring.h
+ * @brief APR Rings
+ */
+
+/*
+ * for offsetof()
+ */
+#include "apr_general.h"
+
+/**
+ * @defgroup apr_ring Ring Macro Implementations
+ * @ingroup APR
+ * A ring is a kind of doubly-linked list that can be manipulated
+ * without knowing where its head is.
+ * @{
+ */
+
+/**
+ * The Ring Element
+ *
+ * A ring element struct is linked to the other elements in the ring
+ * through its ring entry field, e.g.
+ * <pre>
+ * struct my_element_t {
+ * APR_RING_ENTRY(my_element_t) link;
+ * int foo;
+ * char *bar;
+ * };
+ * </pre>
+ *
+ * An element struct may be put on more than one ring if it has more
+ * than one APR_RING_ENTRY field. Each APR_RING_ENTRY has a corresponding
+ * APR_RING_HEAD declaration.
+ *
+ * @warning For strict C standards compliance you should put the APR_RING_ENTRY
+ * first in the element struct unless the head is always part of a larger
+ * object with enough earlier fields to accommodate the offsetof() used
+ * to compute the ring sentinel below. You can usually ignore this caveat.
+ */
+#define APR_RING_ENTRY(elem) \
+ struct { \
+ struct elem *next; \
+ struct elem *prev; \
+ }
+
+/**
+ * The Ring Head
+ *
+ * Each ring is managed via its head, which is a struct declared like this:
+ * <pre>
+ * APR_RING_HEAD(my_ring_t, my_element_t);
+ * struct my_ring_t ring, *ringp;
+ * </pre>
+ *
+ * This struct looks just like the element link struct so that we can
+ * be sure that the typecasting games will work as expected.
+ *
+ * The first element in the ring is next after the head, and the last
+ * element is just before the head.
+ */
+#define APR_RING_HEAD(head, elem) \
+ struct head { \
+ struct elem * volatile next; \
+ struct elem * volatile prev; \
+ }
+
+/**
+ * The Ring Sentinel
+ *
+ * This is the magic pointer value that occurs before the first and
+ * after the last elements in the ring, computed from the address of
+ * the ring's head. The head itself isn't an element, but in order to
+ * get rid of all the special cases when dealing with the ends of the
+ * ring, we play typecasting games to make it look like one.
+ *
+ * Here is a diagram to illustrate the arrangements of the next and
+ * prev pointers of each element in a single ring. Note that they point
+ * to the start of each element, not to the APR_RING_ENTRY structure.
+ *
+ * <pre>
+ * +->+------+<-+ +->+------+<-+ +->+------+<-+
+ * | |struct| | | |struct| | | |struct| |
+ * / | elem | \/ | elem | \/ | elem | \
+ * ... | | /\ | | /\ | | ...
+ * +------+ | | +------+ | | +------+
+ * ...--|prev | | +--|ring | | +--|prev |
+ * | next|--+ | entry|--+ | next|--...
+ * +------+ +------+ +------+
+ * | etc. | | etc. | | etc. |
+ * : : : : : :
+ * </pre>
+ *
+ * The APR_RING_HEAD is nothing but a bare APR_RING_ENTRY. The prev
+ * and next pointers in the first and last elements don't actually
+ * point to the head, they point to a phantom place called the
+ * sentinel. Its value is such that last->next->next == first because
+ * the offset from the sentinel to the head's next pointer is the same
+ * as the offset from the start of an element to its next pointer.
+ * This also works in the opposite direction.
+ *
+ * <pre>
+ * last first
+ * +->+------+<-+ +->sentinel<-+ +->+------+<-+
+ * | |struct| | | | | |struct| |
+ * / | elem | \/ \/ | elem | \
+ * ... | | /\ /\ | | ...
+ * +------+ | | +------+ | | +------+
+ * ...--|prev | | +--|ring | | +--|prev |
+ * | next|--+ | head|--+ | next|--...
+ * +------+ +------+ +------+
+ * | etc. | | etc. |
+ * : : : :
+ * </pre>
+ *
+ * Note that the offset mentioned above is different for each kind of
+ * ring that the element may be on, and each kind of ring has a unique
+ * name for its APR_RING_ENTRY in each element, and has its own type
+ * for its APR_RING_HEAD.
+ *
+ * Note also that if the offset is non-zero (which is required if an
+ * element has more than one APR_RING_ENTRY), the unreality of the
+ * sentinel may have bad implications on very perverse implementations
+ * of C -- see the warning in APR_RING_ENTRY.
+ *
+ * @param hp The head of the ring
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_SENTINEL(hp, elem, link) \
+ (struct elem *)((char *)(hp) - APR_OFFSETOF(struct elem, link))
+
+/**
+ * The first element of the ring
+ * @param hp The head of the ring
+ */
+#define APR_RING_FIRST(hp) (hp)->next
+/**
+ * The last element of the ring
+ * @param hp The head of the ring
+ */
+#define APR_RING_LAST(hp) (hp)->prev
+/**
+ * The next element in the ring
+ * @param ep The current element
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_NEXT(ep, link) (ep)->link.next
+/**
+ * The previous element in the ring
+ * @param ep The current element
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_PREV(ep, link) (ep)->link.prev
+
+
+/**
+ * Initialize a ring
+ * @param hp The head of the ring
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_INIT(hp, elem, link) do { \
+ APR_RING_FIRST((hp)) = APR_RING_SENTINEL((hp), elem, link); \
+ APR_RING_LAST((hp)) = APR_RING_SENTINEL((hp), elem, link); \
+ } while (0)
+
+/**
+ * Determine if a ring is empty
+ * @param hp The head of the ring
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ * @return true or false
+ */
+#define APR_RING_EMPTY(hp, elem, link) \
+ (APR_RING_FIRST((hp)) == APR_RING_SENTINEL((hp), elem, link))
+
+/**
+ * Initialize a singleton element
+ * @param ep The element
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_ELEM_INIT(ep, link) do { \
+ APR_RING_NEXT((ep), link) = (ep); \
+ APR_RING_PREV((ep), link) = (ep); \
+ } while (0)
+
+
+/**
+ * Splice the sequence ep1..epN into the ring before element lep
+ * (..lep.. becomes ..ep1..epN..lep..)
+ * @warning This doesn't work for splicing before the first element or on
+ * empty rings... see APR_RING_SPLICE_HEAD for one that does
+ * @param lep Element in the ring to splice before
+ * @param ep1 First element in the sequence to splice in
+ * @param epN Last element in the sequence to splice in
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_SPLICE_BEFORE(lep, ep1, epN, link) do { \
+ APR_RING_NEXT((epN), link) = (lep); \
+ APR_RING_PREV((ep1), link) = APR_RING_PREV((lep), link); \
+ APR_RING_NEXT(APR_RING_PREV((lep), link), link) = (ep1); \
+ APR_RING_PREV((lep), link) = (epN); \
+ } while (0)
+
+/**
+ * Splice the sequence ep1..epN into the ring after element lep
+ * (..lep.. becomes ..lep..ep1..epN..)
+ * @warning This doesn't work for splicing after the last element or on
+ * empty rings... see APR_RING_SPLICE_TAIL for one that does
+ * @param lep Element in the ring to splice after
+ * @param ep1 First element in the sequence to splice in
+ * @param epN Last element in the sequence to splice in
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_SPLICE_AFTER(lep, ep1, epN, link) do { \
+ APR_RING_PREV((ep1), link) = (lep); \
+ APR_RING_NEXT((epN), link) = APR_RING_NEXT((lep), link); \
+ APR_RING_PREV(APR_RING_NEXT((lep), link), link) = (epN); \
+ APR_RING_NEXT((lep), link) = (ep1); \
+ } while (0)
+
+/**
+ * Insert the element nep into the ring before element lep
+ * (..lep.. becomes ..nep..lep..)
+ * @warning This doesn't work for inserting before the first element or on
+ * empty rings... see APR_RING_INSERT_HEAD for one that does
+ * @param lep Element in the ring to insert before
+ * @param nep Element to insert
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_INSERT_BEFORE(lep, nep, link) \
+ APR_RING_SPLICE_BEFORE((lep), (nep), (nep), link)
+
+/**
+ * Insert the element nep into the ring after element lep
+ * (..lep.. becomes ..lep..nep..)
+ * @warning This doesn't work for inserting after the last element or on
+ * empty rings... see APR_RING_INSERT_TAIL for one that does
+ * @param lep Element in the ring to insert after
+ * @param nep Element to insert
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_INSERT_AFTER(lep, nep, link) \
+ APR_RING_SPLICE_AFTER((lep), (nep), (nep), link)
+
+
+/**
+ * Splice the sequence ep1..epN into the ring before the first element
+ * (..hp.. becomes ..hp..ep1..epN..)
+ * @param hp Head of the ring
+ * @param ep1 First element in the sequence to splice in
+ * @param epN Last element in the sequence to splice in
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_SPLICE_HEAD(hp, ep1, epN, elem, link) \
+ APR_RING_SPLICE_AFTER(APR_RING_SENTINEL((hp), elem, link), \
+ (ep1), (epN), link)
+
+/**
+ * Splice the sequence ep1..epN into the ring after the last element
+ * (..hp.. becomes ..ep1..epN..hp..)
+ * @param hp Head of the ring
+ * @param ep1 First element in the sequence to splice in
+ * @param epN Last element in the sequence to splice in
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_SPLICE_TAIL(hp, ep1, epN, elem, link) \
+ APR_RING_SPLICE_BEFORE(APR_RING_SENTINEL((hp), elem, link), \
+ (ep1), (epN), link)
+
+/**
+ * Insert the element nep into the ring before the first element
+ * (..hp.. becomes ..hp..nep..)
+ * @param hp Head of the ring
+ * @param nep Element to insert
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_INSERT_HEAD(hp, nep, elem, link) \
+ APR_RING_SPLICE_HEAD((hp), (nep), (nep), elem, link)
+
+/**
+ * Insert the element nep into the ring after the last element
+ * (..hp.. becomes ..nep..hp..)
+ * @param hp Head of the ring
+ * @param nep Element to insert
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_INSERT_TAIL(hp, nep, elem, link) \
+ APR_RING_SPLICE_TAIL((hp), (nep), (nep), elem, link)
+
+/**
+ * Concatenate ring h2 onto the end of ring h1, leaving h2 empty.
+ * @param h1 Head of the ring to concatenate onto
+ * @param h2 Head of the ring to concatenate
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_CONCAT(h1, h2, elem, link) do { \
+ if (!APR_RING_EMPTY((h2), elem, link)) { \
+ APR_RING_SPLICE_BEFORE(APR_RING_SENTINEL((h1), elem, link), \
+ APR_RING_FIRST((h2)), \
+ APR_RING_LAST((h2)), link); \
+ APR_RING_INIT((h2), elem, link); \
+ } \
+ } while (0)
+
+/**
+ * Prepend ring h2 onto the beginning of ring h1, leaving h2 empty.
+ * @param h1 Head of the ring to prepend onto
+ * @param h2 Head of the ring to prepend
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_PREPEND(h1, h2, elem, link) do { \
+ if (!APR_RING_EMPTY((h2), elem, link)) { \
+ APR_RING_SPLICE_AFTER(APR_RING_SENTINEL((h1), elem, link), \
+ APR_RING_FIRST((h2)), \
+ APR_RING_LAST((h2)), link); \
+ APR_RING_INIT((h2), elem, link); \
+ } \
+ } while (0)
+
+/**
+ * Unsplice a sequence of elements from a ring
+ * @warning The unspliced sequence is left with dangling pointers at either end
+ * @param ep1 First element in the sequence to unsplice
+ * @param epN Last element in the sequence to unsplice
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_UNSPLICE(ep1, epN, link) do { \
+ APR_RING_NEXT(APR_RING_PREV((ep1), link), link) = \
+ APR_RING_NEXT((epN), link); \
+ APR_RING_PREV(APR_RING_NEXT((epN), link), link) = \
+ APR_RING_PREV((ep1), link); \
+ } while (0)
+
+/**
+ * Remove a single element from a ring
+ * @warning The unspliced element is left with dangling pointers at either end
+ * @param ep Element to remove
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_REMOVE(ep, link) \
+ APR_RING_UNSPLICE((ep), (ep), link)
+
+
+/**
+ * Iterate through a ring
+ * @param ep The current element
+ * @param hp The ring to iterate over
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ * @remark This is the same as either:
+ * <pre>
+ * ep = APR_RING_FIRST(hp);
+ * while (ep != APR_RING_SENTINEL(hp, elem, link)) {
+ * ...
+ * ep = APR_RING_NEXT(ep, link);
+ * }
+ * OR
+ * for (ep = APR_RING_FIRST(hp);
+ * ep != APR_RING_SENTINEL(hp, elem, link);
+ * ep = APR_RING_NEXT(ep, link)) {
+ * ...
+ * }
+ * </pre>
+ * @warning Be aware that you cannot change the value of ep within
+ * the foreach loop, nor can you destroy the ring element it points to.
+ * Modifying the prev and next pointers of the element is dangerous
+ * but can be done if you're careful. If you change ep's value or
+ * destroy the element it points to, then APR_RING_FOREACH
+ * will have no way to find out what element to use for its next
+ * iteration. The reason for this can be seen by looking closely
+ * at the equivalent loops given in the tip above. So, for example,
+ * if you are writing a loop that empties out a ring one element
+ * at a time, APR_RING_FOREACH just won't work for you. Do it
+ * by hand, like so:
+ * <pre>
+ * while (!APR_RING_EMPTY(hp, elem, link)) {
+ * ep = APR_RING_FIRST(hp);
+ * ...
+ * APR_RING_REMOVE(ep, link);
+ * }
+ * </pre>
+ * @deprecated This macro causes more headaches than it's worth. Use
+ * one of the alternatives documented here instead; the clarity gained
+ * in what's really going on is well worth the extra line or two of code.
+ * This macro will be removed at some point in the future.
+ */
+#define APR_RING_FOREACH(ep, hp, elem, link) \
+ for ((ep) = APR_RING_FIRST((hp)); \
+ (ep) != APR_RING_SENTINEL((hp), elem, link); \
+ (ep) = APR_RING_NEXT((ep), link))
+
+/**
+ * Iterate through a ring backwards
+ * @param ep The current element
+ * @param hp The ring to iterate over
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ * @see APR_RING_FOREACH
+ */
+#define APR_RING_FOREACH_REVERSE(ep, hp, elem, link) \
+ for ((ep) = APR_RING_LAST((hp)); \
+ (ep) != APR_RING_SENTINEL((hp), elem, link); \
+ (ep) = APR_RING_PREV((ep), link))
+
+
+/* Debugging tools: */
+
+#ifdef APR_RING_DEBUG
+#include <stdio.h>
+#include <assert.h>
+
+#define APR_RING_CHECK_ONE(msg, ptr) \
+ fprintf(stderr, "*** %s %p\n", msg, ptr)
+
+#define APR_RING_CHECK(hp, elem, link, msg) \
+ APR_RING_CHECK_ELEM(APR_RING_SENTINEL(hp, elem, link), elem, link, msg)
+
+#define APR_RING_CHECK_ELEM(ep, elem, link, msg) do { \
+ struct elem *start = (ep); \
+ struct elem *here = start; \
+ fprintf(stderr, "*** ring check start -- %s\n", msg); \
+ do { \
+ fprintf(stderr, "\telem %p\n", here); \
+ fprintf(stderr, "\telem->next %p\n", \
+ APR_RING_NEXT(here, link)); \
+ fprintf(stderr, "\telem->prev %p\n", \
+ APR_RING_PREV(here, link)); \
+ fprintf(stderr, "\telem->next->prev %p\n", \
+ APR_RING_PREV(APR_RING_NEXT(here, link), link)); \
+ fprintf(stderr, "\telem->prev->next %p\n", \
+ APR_RING_NEXT(APR_RING_PREV(here, link), link)); \
+ if (APR_RING_PREV(APR_RING_NEXT(here, link), link) != here) { \
+ fprintf(stderr, "\t*** elem->next->prev != elem\n"); \
+ break; \
+ } \
+ if (APR_RING_NEXT(APR_RING_PREV(here, link), link) != here) { \
+ fprintf(stderr, "\t*** elem->prev->next != elem\n"); \
+ break; \
+ } \
+ here = APR_RING_NEXT(here, link); \
+ } while (here != start); \
+ fprintf(stderr, "*** ring check end\n"); \
+ } while (0)
+
+#define APR_RING_CHECK_CONSISTENCY(hp, elem, link) \
+ APR_RING_CHECK_ELEM_CONSISTENCY(APR_RING_SENTINEL(hp, elem, link),\
+ elem, link)
+
+#define APR_RING_CHECK_ELEM_CONSISTENCY(ep, elem, link) do { \
+ struct elem *start = (ep); \
+ struct elem *here = start; \
+ do { \
+ assert(APR_RING_PREV(APR_RING_NEXT(here, link), link) == here); \
+ assert(APR_RING_NEXT(APR_RING_PREV(here, link), link) == here); \
+ here = APR_RING_NEXT(here, link); \
+ } while (here != start); \
+ } while (0)
+
+#else
+/**
+ * Print a single pointer value to STDERR
+ * (This is a no-op unless APR_RING_DEBUG is defined.)
+ * @param msg Descriptive message
+ * @param ptr Pointer value to print
+ */
+#define APR_RING_CHECK_ONE(msg, ptr)
+/**
+ * Dump all ring pointers to STDERR, starting with the head and looping all
+ * the way around the ring back to the head. Aborts if an inconsistency
+ * is found.
+ * (This is a no-op unless APR_RING_DEBUG is defined.)
+ * @param hp Head of the ring
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ * @param msg Descriptive message
+ */
+#define APR_RING_CHECK(hp, elem, link, msg)
+/**
+ * Loops around a ring and checks all the pointers for consistency. Pops
+ * an assertion if any inconsistency is found. Same idea as APR_RING_CHECK()
+ * except that it's silent if all is well.
+ * (This is a no-op unless APR_RING_DEBUG is defined.)
+ * @param hp Head of the ring
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_CHECK_CONSISTENCY(hp, elem, link)
+/**
+ * Dump all ring pointers to STDERR, starting with the given element and
+ * looping all the way around the ring back to that element. Aborts if
+ * an inconsistency is found.
+ * (This is a no-op unless APR_RING_DEBUG is defined.)
+ * @param ep The element
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ * @param msg Descriptive message
+ */
+#define APR_RING_CHECK_ELEM(ep, elem, link, msg)
+/**
+ * Loops around a ring, starting with the given element, and checks all
+ * the pointers for consistency. Pops an assertion if any inconsistency
+ * is found. Same idea as APR_RING_CHECK_ELEM() except that it's silent
+ * if all is well.
+ * (This is a no-op unless APR_RING_DEBUG is defined.)
+ * @param ep The element
+ * @param elem The name of the element struct
+ * @param link The name of the APR_RING_ENTRY in the element struct
+ */
+#define APR_RING_CHECK_ELEM_CONSISTENCY(ep, elem, link)
+#endif
+
+/** @} */
+
+#endif /* !APR_RING_H */