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authorhongbotian <hongbo.tianhongbo@huawei.com>2015-11-30 03:10:21 -0500
committerhongbotian <hongbo.tianhongbo@huawei.com>2015-11-30 03:10:21 -0500
commitc0b7206652b2852bc574694e7ba07ba1c2acdc00 (patch)
tree5cb95cb0e19e03610525903df46279df2c3b7eb1 /rubbos/app/httpd-2.0.64/srclib/apr/include/apr_ring.h
parentb6d3d6e668b793220f2d3af1bc3e828553dc3fe6 (diff)
delete app
Change-Id: Id4c572809969ebe89e946e88063eaed262cff3f2 Signed-off-by: hongbotian <hongbo.tianhongbo@huawei.com>
Diffstat (limited to 'rubbos/app/httpd-2.0.64/srclib/apr/include/apr_ring.h')
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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 */