* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
-/*
+/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*/
#ifndef _SYS_QUEUE_H_
-#define _SYS_QUEUE_H_
+#define _SYS_QUEUE_H_
+
+#ifdef KERNEL_PRIVATE
+#include <kern/debug.h> /* panic function call */
+#include <sys/cdefs.h> /* __improbable in kernelspace */
+#else
+#ifndef __improbable
+#define __improbable(x) (x) /* noop in userspace */
+#endif /* __improbable */
+#endif /* KERNEL_PRIVATE */
/*
* This file defines five types of data structures: singly-linked lists,
- * slingly-linked tail queues, lists, tail queues, and circular queues.
+ * singly-linked tail queues, lists, tail queues, and circular queues.
*
* A singly-linked list is headed by a single forward pointer. The elements
* are singly linked for minimum space and pointer manipulation overhead at
* linked so that an arbitrary element can be removed without a need to
* traverse the list. New elements can be added to the list before or
* after an existing element, at the head of the list, or at the end of
- * the list. A tail queue may only be traversed in the forward direction.
+ * the list. A tail queue may be traversed in either direction.
*
* A circle queue is headed by a pair of pointers, one to the head of the
* list and the other to the tail of the list. The elements are doubly
* an existing element, at the head of the list, or at the end of the list.
* A circle queue may be traversed in either direction, but has a more
* complex end of list detection.
+ * Note that circle queues are deprecated, because, as the removal log
+ * in FreeBSD states, "CIRCLEQs are a disgrace to everything Knuth taught
+ * us in Volume 1 Chapter 2. [...] Use TAILQ instead, it provides the same
+ * functionality." Code using them will continue to compile, but they
+ * are no longer documented on the man page.
*
* For details on the use of these macros, see the queue(3) manual page.
*
*
- * SLIST LIST STAILQ TAILQ CIRCLEQ
- * _HEAD + + + + +
- * _ENTRY + + + + +
- * _INIT + + + + +
- * _EMPTY + + + + +
- * _FIRST + + + + +
- * _NEXT + + + + +
- * _PREV - - - + +
- * _LAST - - + + +
- * _FOREACH + + - + +
- * _INSERT_HEAD + + + + +
- * _INSERT_BEFORE - + - + +
- * _INSERT_AFTER + + + + +
- * _INSERT_TAIL - - + + +
- * _REMOVE_HEAD + - + - -
- * _REMOVE + + + + +
+ * SLIST LIST STAILQ TAILQ CIRCLEQ
+ * _HEAD + + + + +
+ * _HEAD_INITIALIZER + + + + -
+ * _ENTRY + + + + +
+ * _INIT + + + + +
+ * _EMPTY + + + + +
+ * _FIRST + + + + +
+ * _NEXT + + + + +
+ * _PREV - - - + +
+ * _LAST - - + + +
+ * _FOREACH + + + + +
+ * _FOREACH_SAFE + + + + -
+ * _FOREACH_REVERSE - - - + -
+ * _FOREACH_REVERSE_SAFE - - - + -
+ * _INSERT_HEAD + + + + +
+ * _INSERT_BEFORE - + - + +
+ * _INSERT_AFTER + + + + +
+ * _INSERT_TAIL - - + + +
+ * _CONCAT - - + + -
+ * _REMOVE_AFTER + - + - -
+ * _REMOVE_HEAD + - + - -
+ * _REMOVE_HEAD_UNTIL - - + - -
+ * _REMOVE + + + + +
+ * _SWAP - + + + -
*
*/
+#ifdef QUEUE_MACRO_DEBUG
+/* Store the last 2 places the queue element or head was altered */
+struct qm_trace {
+ char * lastfile;
+ int lastline;
+ char * prevfile;
+ int prevline;
+};
+
+#define TRACEBUF struct qm_trace trace;
+#define TRASHIT(x) do {(x) = (void *)-1;} while (0)
+
+#define QMD_TRACE_HEAD(head) do { \
+ (head)->trace.prevline = (head)->trace.lastline; \
+ (head)->trace.prevfile = (head)->trace.lastfile; \
+ (head)->trace.lastline = __LINE__; \
+ (head)->trace.lastfile = __FILE__; \
+} while (0)
+
+#define QMD_TRACE_ELEM(elem) do { \
+ (elem)->trace.prevline = (elem)->trace.lastline; \
+ (elem)->trace.prevfile = (elem)->trace.lastfile; \
+ (elem)->trace.lastline = __LINE__; \
+ (elem)->trace.lastfile = __FILE__; \
+} while (0)
+
+#else
+#define QMD_TRACE_ELEM(elem)
+#define QMD_TRACE_HEAD(head)
+#define TRACEBUF
+#define TRASHIT(x)
+#endif /* QUEUE_MACRO_DEBUG */
/*
- * Singly-linked List definitions.
+ * Horrible macros to enable use of code that was meant to be C-specific
+ * (and which push struct onto type) in C++; without these, C++ code
+ * that uses these macros in the context of a class will blow up
+ * due to "struct" being preprended to "type" by the macros, causing
+ * inconsistent use of tags.
+ *
+ * This approach is necessary because these are macros; we have to use
+ * these on a per-macro basis (because the queues are implemented as
+ * macros, disabling this warning in the scope of the header file is
+ * insufficient), whuch means we can't use #pragma, and have to use
+ * _Pragma. We only need to use these for the queue macros that
+ * prepend "struct" to "type" and will cause C++ to blow up.
*/
-#define SLIST_HEAD(name, type) \
-struct name { \
- struct type *slh_first; /* first element */ \
-}
-
-#define SLIST_ENTRY(type) \
-struct { \
- struct type *sle_next; /* next element */ \
-}
-
+#if defined(__clang__) && defined(__cplusplus)
+#define __MISMATCH_TAGS_PUSH \
+ _Pragma("clang diagnostic push") \
+ _Pragma("clang diagnostic ignored \"-Wmismatched-tags\"")
+#define __MISMATCH_TAGS_POP \
+ _Pragma("clang diagnostic pop")
+#else
+#define __MISMATCH_TAGS_PUSH
+#define __MISMATCH_TAGS_POP
+#endif
+
+/*!
+ * Ensures that these macros can safely be used in structs when compiling with
+ * clang. The macros do not allow for nullability attributes to be specified due
+ * to how they are expanded. For example:
+ *
+ * SLIST_HEAD(, foo _Nullable) bar;
+ *
+ * expands to
+ *
+ * struct {
+ * struct foo _Nullable *slh_first;
+ * }
+ *
+ * which is not valid because the nullability specifier has to apply to the
+ * pointer. So just ignore nullability completeness in all the places where this
+ * is an issue.
+ */
+#if defined(__clang__)
+#define __NULLABILITY_COMPLETENESS_PUSH \
+ _Pragma("clang diagnostic push") \
+ _Pragma("clang diagnostic ignored \"-Wnullability-completeness\"")
+#define __NULLABILITY_COMPLETENESS_POP \
+ _Pragma("clang diagnostic pop")
+#else
+#define __NULLABILITY_COMPLETENESS_PUSH
+#define __NULLABILITY_COMPLETENESS_POP
+#endif
+
+/*
+ * Singly-linked List declarations.
+ */
+#define SLIST_HEAD(name, type) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+struct name { \
+ struct type *slh_first; /* first element */ \
+} \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
+
+#define SLIST_HEAD_INITIALIZER(head) \
+ { NULL }
+
+#define SLIST_ENTRY(type) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+struct { \
+ struct type *sle_next; /* next element */ \
+} \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
+
/*
* Singly-linked List functions.
*/
-#define SLIST_EMPTY(head) ((head)->slh_first == NULL)
+#define SLIST_EMPTY(head) ((head)->slh_first == NULL)
-#define SLIST_FIRST(head) ((head)->slh_first)
+#define SLIST_FIRST(head) ((head)->slh_first)
-#define SLIST_FOREACH(var, head, field) \
- for((var) = (head)->slh_first; (var); (var) = (var)->field.sle_next)
+#define SLIST_FOREACH(var, head, field) \
+ for ((var) = SLIST_FIRST((head)); \
+ (var); \
+ (var) = SLIST_NEXT((var), field))
-#define SLIST_INIT(head) { \
- (head)->slh_first = NULL; \
-}
+#define SLIST_FOREACH_SAFE(var, head, field, tvar) \
+ for ((var) = SLIST_FIRST((head)); \
+ (var) && ((tvar) = SLIST_NEXT((var), field), 1); \
+ (var) = (tvar))
-#define SLIST_INSERT_AFTER(slistelm, elm, field) do { \
- (elm)->field.sle_next = (slistelm)->field.sle_next; \
- (slistelm)->field.sle_next = (elm); \
+#define SLIST_FOREACH_PREVPTR(var, varp, head, field) \
+ for ((varp) = &SLIST_FIRST((head)); \
+ ((var) = *(varp)) != NULL; \
+ (varp) = &SLIST_NEXT((var), field))
+
+#define SLIST_INIT(head) do { \
+ SLIST_FIRST((head)) = NULL; \
} while (0)
-#define SLIST_INSERT_HEAD(head, elm, field) do { \
- (elm)->field.sle_next = (head)->slh_first; \
- (head)->slh_first = (elm); \
+#define SLIST_INSERT_AFTER(slistelm, elm, field) do { \
+ SLIST_NEXT((elm), field) = SLIST_NEXT((slistelm), field); \
+ SLIST_NEXT((slistelm), field) = (elm); \
} while (0)
-#define SLIST_NEXT(elm, field) ((elm)->field.sle_next)
+#define SLIST_INSERT_HEAD(head, elm, field) do { \
+ SLIST_NEXT((elm), field) = SLIST_FIRST((head)); \
+ SLIST_FIRST((head)) = (elm); \
+} while (0)
-#define SLIST_REMOVE_HEAD(head, field) do { \
- (head)->slh_first = (head)->slh_first->field.sle_next; \
+#define SLIST_NEXT(elm, field) ((elm)->field.sle_next)
+
+#define SLIST_REMOVE(head, elm, type, field) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+do { \
+ if (SLIST_FIRST((head)) == (elm)) { \
+ SLIST_REMOVE_HEAD((head), field); \
+ } \
+ else { \
+ struct type *curelm = SLIST_FIRST((head)); \
+ while (SLIST_NEXT(curelm, field) != (elm)) \
+ curelm = SLIST_NEXT(curelm, field); \
+ SLIST_REMOVE_AFTER(curelm, field); \
+ } \
+ TRASHIT((elm)->field.sle_next); \
+} while (0) \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
+
+#define SLIST_REMOVE_AFTER(elm, field) do { \
+ SLIST_NEXT(elm, field) = \
+ SLIST_NEXT(SLIST_NEXT(elm, field), field); \
} while (0)
-#define SLIST_REMOVE(head, elm, type, field) do { \
- if ((head)->slh_first == (elm)) { \
- SLIST_REMOVE_HEAD((head), field); \
- } \
- else { \
- struct type *curelm = (head)->slh_first; \
- while( curelm->field.sle_next != (elm) ) \
- curelm = curelm->field.sle_next; \
- curelm->field.sle_next = \
- curelm->field.sle_next->field.sle_next; \
- } \
+#define SLIST_REMOVE_HEAD(head, field) do { \
+ SLIST_FIRST((head)) = SLIST_NEXT(SLIST_FIRST((head)), field); \
} while (0)
/*
- * Singly-linked Tail queue definitions.
+ * Singly-linked Tail queue declarations.
*/
-#define STAILQ_HEAD(name, type) \
-struct name { \
- struct type *stqh_first;/* first element */ \
- struct type **stqh_last;/* addr of last next element */ \
-}
-
-#define STAILQ_HEAD_INITIALIZER(head) \
+#define STAILQ_HEAD(name, type) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+struct name { \
+ struct type *stqh_first;/* first element */ \
+ struct type **stqh_last;/* addr of last next element */ \
+} \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
+
+#define STAILQ_HEAD_INITIALIZER(head) \
{ NULL, &(head).stqh_first }
-#define STAILQ_ENTRY(type) \
-struct { \
- struct type *stqe_next; /* next element */ \
-}
+#define STAILQ_ENTRY(type) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+struct { \
+ struct type *stqe_next; /* next element */ \
+} \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
/*
* Singly-linked Tail queue functions.
*/
-#define STAILQ_EMPTY(head) ((head)->stqh_first == NULL)
-
-#define STAILQ_INIT(head) do { \
- (head)->stqh_first = NULL; \
- (head)->stqh_last = &(head)->stqh_first; \
+#define STAILQ_CONCAT(head1, head2) do { \
+ if (!STAILQ_EMPTY((head2))) { \
+ *(head1)->stqh_last = (head2)->stqh_first; \
+ (head1)->stqh_last = (head2)->stqh_last; \
+ STAILQ_INIT((head2)); \
+ } \
} while (0)
-#define STAILQ_FIRST(head) ((head)->stqh_first)
-#define STAILQ_LAST(head) (*(head)->stqh_last)
+#define STAILQ_EMPTY(head) ((head)->stqh_first == NULL)
-#define STAILQ_INSERT_HEAD(head, elm, field) do { \
- if (((elm)->field.stqe_next = (head)->stqh_first) == NULL) \
- (head)->stqh_last = &(elm)->field.stqe_next; \
- (head)->stqh_first = (elm); \
-} while (0)
+#define STAILQ_FIRST(head) ((head)->stqh_first)
-#define STAILQ_INSERT_TAIL(head, elm, field) do { \
- (elm)->field.stqe_next = NULL; \
- *(head)->stqh_last = (elm); \
- (head)->stqh_last = &(elm)->field.stqe_next; \
+#define STAILQ_FOREACH(var, head, field) \
+ for((var) = STAILQ_FIRST((head)); \
+ (var); \
+ (var) = STAILQ_NEXT((var), field))
+
+
+#define STAILQ_FOREACH_SAFE(var, head, field, tvar) \
+ for ((var) = STAILQ_FIRST((head)); \
+ (var) && ((tvar) = STAILQ_NEXT((var), field), 1); \
+ (var) = (tvar))
+
+#define STAILQ_INIT(head) do { \
+ STAILQ_FIRST((head)) = NULL; \
+ (head)->stqh_last = &STAILQ_FIRST((head)); \
} while (0)
-#define STAILQ_INSERT_AFTER(head, tqelm, elm, field) do { \
- if (((elm)->field.stqe_next = (tqelm)->field.stqe_next) == NULL)\
- (head)->stqh_last = &(elm)->field.stqe_next; \
- (tqelm)->field.stqe_next = (elm); \
+#define STAILQ_INSERT_AFTER(head, tqelm, elm, field) do { \
+ if ((STAILQ_NEXT((elm), field) = STAILQ_NEXT((tqelm), field)) == NULL)\
+ (head)->stqh_last = &STAILQ_NEXT((elm), field); \
+ STAILQ_NEXT((tqelm), field) = (elm); \
} while (0)
-#define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)
+#define STAILQ_INSERT_HEAD(head, elm, field) do { \
+ if ((STAILQ_NEXT((elm), field) = STAILQ_FIRST((head))) == NULL) \
+ (head)->stqh_last = &STAILQ_NEXT((elm), field); \
+ STAILQ_FIRST((head)) = (elm); \
+} while (0)
-#define STAILQ_REMOVE_HEAD(head, field) do { \
- if (((head)->stqh_first = \
- (head)->stqh_first->field.stqe_next) == NULL) \
- (head)->stqh_last = &(head)->stqh_first; \
+#define STAILQ_INSERT_TAIL(head, elm, field) do { \
+ STAILQ_NEXT((elm), field) = NULL; \
+ *(head)->stqh_last = (elm); \
+ (head)->stqh_last = &STAILQ_NEXT((elm), field); \
} while (0)
-#define STAILQ_REMOVE_HEAD_UNTIL(head, elm, field) do { \
- if (((head)->stqh_first = (elm)->field.stqe_next) == NULL) \
- (head)->stqh_last = &(head)->stqh_first; \
+#define STAILQ_LAST(head, type, field) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+ (STAILQ_EMPTY((head)) ? \
+ NULL : \
+ ((struct type *)(void *) \
+ ((char *)((head)->stqh_last) - __offsetof(struct type, field))))\
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
+
+#define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)
+
+#define STAILQ_REMOVE(head, elm, type, field) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+do { \
+ if (STAILQ_FIRST((head)) == (elm)) { \
+ STAILQ_REMOVE_HEAD((head), field); \
+ } \
+ else { \
+ struct type *curelm = STAILQ_FIRST((head)); \
+ while (STAILQ_NEXT(curelm, field) != (elm)) \
+ curelm = STAILQ_NEXT(curelm, field); \
+ STAILQ_REMOVE_AFTER(head, curelm, field); \
+ } \
+ TRASHIT((elm)->field.stqe_next); \
+} while (0) \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
+
+#define STAILQ_REMOVE_HEAD(head, field) do { \
+ if ((STAILQ_FIRST((head)) = \
+ STAILQ_NEXT(STAILQ_FIRST((head)), field)) == NULL) \
+ (head)->stqh_last = &STAILQ_FIRST((head)); \
} while (0)
+#define STAILQ_REMOVE_HEAD_UNTIL(head, elm, field) do { \
+ if ((STAILQ_FIRST((head)) = STAILQ_NEXT((elm), field)) == NULL) \
+ (head)->stqh_last = &STAILQ_FIRST((head)); \
+} while (0)
-#define STAILQ_REMOVE(head, elm, type, field) do { \
- if ((head)->stqh_first == (elm)) { \
- STAILQ_REMOVE_HEAD(head, field); \
- } \
- else { \
- struct type *curelm = (head)->stqh_first; \
- while( curelm->field.stqe_next != (elm) ) \
- curelm = curelm->field.stqe_next; \
- if((curelm->field.stqe_next = \
- curelm->field.stqe_next->field.stqe_next) == NULL) \
- (head)->stqh_last = &(curelm)->field.stqe_next; \
- } \
+#define STAILQ_REMOVE_AFTER(head, elm, field) do { \
+ if ((STAILQ_NEXT(elm, field) = \
+ STAILQ_NEXT(STAILQ_NEXT(elm, field), field)) == NULL) \
+ (head)->stqh_last = &STAILQ_NEXT((elm), field); \
} while (0)
+#define STAILQ_SWAP(head1, head2, type) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+do { \
+ struct type *swap_first = STAILQ_FIRST(head1); \
+ struct type **swap_last = (head1)->stqh_last; \
+ STAILQ_FIRST(head1) = STAILQ_FIRST(head2); \
+ (head1)->stqh_last = (head2)->stqh_last; \
+ STAILQ_FIRST(head2) = swap_first; \
+ (head2)->stqh_last = swap_last; \
+ if (STAILQ_EMPTY(head1)) \
+ (head1)->stqh_last = &STAILQ_FIRST(head1); \
+ if (STAILQ_EMPTY(head2)) \
+ (head2)->stqh_last = &STAILQ_FIRST(head2); \
+} while (0) \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
+
+
/*
- * List definitions.
+ * List declarations.
*/
-#define LIST_HEAD(name, type) \
-struct name { \
- struct type *lh_first; /* first element */ \
-}
-
-#define LIST_HEAD_INITIALIZER(head) \
+#define LIST_HEAD(name, type) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+struct name { \
+ struct type *lh_first; /* first element */ \
+} \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
+
+#define LIST_HEAD_INITIALIZER(head) \
{ NULL }
-#define LIST_ENTRY(type) \
-struct { \
- struct type *le_next; /* next element */ \
- struct type **le_prev; /* address of previous next element */ \
-}
+#define LIST_ENTRY(type) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+struct { \
+ struct type *le_next; /* next element */ \
+ struct type **le_prev; /* address of previous next element */ \
+} \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
/*
* List functions.
*/
-#define LIST_EMPTY(head) ((head)->lh_first == NULL)
-
-#define LIST_FIRST(head) ((head)->lh_first)
+#ifdef KERNEL_PRIVATE
+#define LIST_CHECK_HEAD(head, field) do { \
+ if (__improbable( \
+ LIST_FIRST((head)) != NULL && \
+ LIST_FIRST((head))->field.le_prev != \
+ &LIST_FIRST((head)))) \
+ panic("Bad list head %p first->prev != head @%u", \
+ (head), __LINE__); \
+} while (0)
-#define LIST_FOREACH(var, head, field) \
- for((var) = (head)->lh_first; (var); (var) = (var)->field.le_next)
+#define LIST_CHECK_NEXT(elm, field) do { \
+ if (__improbable( \
+ LIST_NEXT((elm), field) != NULL && \
+ LIST_NEXT((elm), field)->field.le_prev != \
+ &((elm)->field.le_next))) \
+ panic("Bad link elm %p next->prev != elm @%u", \
+ (elm), __LINE__); \
+} while (0)
-#define LIST_INIT(head) do { \
- (head)->lh_first = NULL; \
+#define LIST_CHECK_PREV(elm, field) do { \
+ if (__improbable(*(elm)->field.le_prev != (elm))) \
+ panic("Bad link elm %p prev->next != elm @%u", \
+ (elm), __LINE__); \
} while (0)
+#else
+#define LIST_CHECK_HEAD(head, field)
+#define LIST_CHECK_NEXT(elm, field)
+#define LIST_CHECK_PREV(elm, field)
+#endif /* KERNEL_PRIVATE */
+
+#define LIST_EMPTY(head) ((head)->lh_first == NULL)
+
+#define LIST_FIRST(head) ((head)->lh_first)
+
+#define LIST_FOREACH(var, head, field) \
+ for ((var) = LIST_FIRST((head)); \
+ (var); \
+ (var) = LIST_NEXT((var), field))
-#define LIST_INSERT_AFTER(listelm, elm, field) do { \
- if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \
- (listelm)->field.le_next->field.le_prev = \
- &(elm)->field.le_next; \
- (listelm)->field.le_next = (elm); \
- (elm)->field.le_prev = &(listelm)->field.le_next; \
+#define LIST_FOREACH_SAFE(var, head, field, tvar) \
+ for ((var) = LIST_FIRST((head)); \
+ (var) && ((tvar) = LIST_NEXT((var), field), 1); \
+ (var) = (tvar))
+
+#define LIST_INIT(head) do { \
+ LIST_FIRST((head)) = NULL; \
} while (0)
-#define LIST_INSERT_BEFORE(listelm, elm, field) do { \
- (elm)->field.le_prev = (listelm)->field.le_prev; \
- (elm)->field.le_next = (listelm); \
- *(listelm)->field.le_prev = (elm); \
- (listelm)->field.le_prev = &(elm)->field.le_next; \
+#define LIST_INSERT_AFTER(listelm, elm, field) do { \
+ LIST_CHECK_NEXT(listelm, field); \
+ if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)\
+ LIST_NEXT((listelm), field)->field.le_prev = \
+ &LIST_NEXT((elm), field); \
+ LIST_NEXT((listelm), field) = (elm); \
+ (elm)->field.le_prev = &LIST_NEXT((listelm), field); \
} while (0)
-#define LIST_INSERT_HEAD(head, elm, field) do { \
- if (((elm)->field.le_next = (head)->lh_first) != NULL) \
- (head)->lh_first->field.le_prev = &(elm)->field.le_next;\
- (head)->lh_first = (elm); \
- (elm)->field.le_prev = &(head)->lh_first; \
+#define LIST_INSERT_BEFORE(listelm, elm, field) do { \
+ LIST_CHECK_PREV(listelm, field); \
+ (elm)->field.le_prev = (listelm)->field.le_prev; \
+ LIST_NEXT((elm), field) = (listelm); \
+ *(listelm)->field.le_prev = (elm); \
+ (listelm)->field.le_prev = &LIST_NEXT((elm), field); \
} while (0)
-#define LIST_NEXT(elm, field) ((elm)->field.le_next)
+#define LIST_INSERT_HEAD(head, elm, field) do { \
+ LIST_CHECK_HEAD((head), field); \
+ if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL) \
+ LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);\
+ LIST_FIRST((head)) = (elm); \
+ (elm)->field.le_prev = &LIST_FIRST((head)); \
+} while (0)
-#define LIST_REMOVE(elm, field) do { \
- if ((elm)->field.le_next != NULL) \
- (elm)->field.le_next->field.le_prev = \
- (elm)->field.le_prev; \
- *(elm)->field.le_prev = (elm)->field.le_next; \
+#define LIST_NEXT(elm, field) ((elm)->field.le_next)
+
+#define LIST_REMOVE(elm, field) do { \
+ LIST_CHECK_NEXT(elm, field); \
+ LIST_CHECK_PREV(elm, field); \
+ if (LIST_NEXT((elm), field) != NULL) \
+ LIST_NEXT((elm), field)->field.le_prev = \
+ (elm)->field.le_prev; \
+ *(elm)->field.le_prev = LIST_NEXT((elm), field); \
+ TRASHIT((elm)->field.le_next); \
+ TRASHIT((elm)->field.le_prev); \
} while (0)
+#define LIST_SWAP(head1, head2, type, field) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+do { \
+ struct type *swap_tmp = LIST_FIRST((head1)); \
+ LIST_FIRST((head1)) = LIST_FIRST((head2)); \
+ LIST_FIRST((head2)) = swap_tmp; \
+ if ((swap_tmp = LIST_FIRST((head1))) != NULL) \
+ swap_tmp->field.le_prev = &LIST_FIRST((head1)); \
+ if ((swap_tmp = LIST_FIRST((head2))) != NULL) \
+ swap_tmp->field.le_prev = &LIST_FIRST((head2)); \
+} while (0) \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
+
/*
- * Tail queue definitions.
+ * Tail queue declarations.
*/
-#define TAILQ_HEAD(name, type) \
-struct name { \
- struct type *tqh_first; /* first element */ \
- struct type **tqh_last; /* addr of last next element */ \
-}
-
-#define TAILQ_HEAD_INITIALIZER(head) \
+#define TAILQ_HEAD(name, type) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+struct name { \
+ struct type *tqh_first; /* first element */ \
+ struct type **tqh_last; /* addr of last next element */ \
+ TRACEBUF \
+} \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
+
+#define TAILQ_HEAD_INITIALIZER(head) \
{ NULL, &(head).tqh_first }
-#define TAILQ_ENTRY(type) \
-struct { \
- struct type *tqe_next; /* next element */ \
- struct type **tqe_prev; /* address of previous next element */ \
-}
+#define TAILQ_ENTRY(type) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+struct { \
+ struct type *tqe_next; /* next element */ \
+ struct type **tqe_prev; /* address of previous next element */ \
+ TRACEBUF \
+} \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
/*
* Tail queue functions.
*/
-#define TAILQ_EMPTY(head) ((head)->tqh_first == NULL)
+#ifdef KERNEL_PRIVATE
+#define TAILQ_CHECK_HEAD(head, field) do { \
+ if (__improbable( \
+ TAILQ_FIRST((head)) != NULL && \
+ TAILQ_FIRST((head))->field.tqe_prev != \
+ &TAILQ_FIRST((head)))) \
+ panic("Bad tailq head %p first->prev != head @%u", \
+ (head), __LINE__); \
+} while (0)
+
+#define TAILQ_CHECK_NEXT(elm, field) do { \
+ if (__improbable( \
+ TAILQ_NEXT((elm), field) != NULL && \
+ TAILQ_NEXT((elm), field)->field.tqe_prev != \
+ &((elm)->field.tqe_next))) \
+ panic("Bad tailq elm %p next->prev != elm @%u", \
+ (elm), __LINE__); \
+} while(0)
+
+#define TAILQ_CHECK_PREV(elm, field) do { \
+ if (__improbable(*(elm)->field.tqe_prev != (elm))) \
+ panic("Bad tailq elm %p prev->next != elm @%u", \
+ (elm), __LINE__); \
+} while(0)
+#else
+#define TAILQ_CHECK_HEAD(head, field)
+#define TAILQ_CHECK_NEXT(elm, field)
+#define TAILQ_CHECK_PREV(elm, field)
+#endif /* KERNEL_PRIVATE */
+
+#define TAILQ_CONCAT(head1, head2, field) do { \
+ if (!TAILQ_EMPTY(head2)) { \
+ *(head1)->tqh_last = (head2)->tqh_first; \
+ (head2)->tqh_first->field.tqe_prev = (head1)->tqh_last; \
+ (head1)->tqh_last = (head2)->tqh_last; \
+ TAILQ_INIT((head2)); \
+ QMD_TRACE_HEAD(head1); \
+ QMD_TRACE_HEAD(head2); \
+ } \
+} while (0)
+
+#define TAILQ_EMPTY(head) ((head)->tqh_first == NULL)
-#define TAILQ_FOREACH(var, head, field) \
- for (var = TAILQ_FIRST(head); var; var = TAILQ_NEXT(var, field))
+#define TAILQ_FIRST(head) ((head)->tqh_first)
-#define TAILQ_FOREACH_REVERSE(var, head, field, headname) \
- for (var = TAILQ_LAST(head, headname); \
- var; var = TAILQ_PREV(var, headname, field))
+#define TAILQ_FOREACH(var, head, field) \
+ for ((var) = TAILQ_FIRST((head)); \
+ (var); \
+ (var) = TAILQ_NEXT((var), field))
-#define TAILQ_FIRST(head) ((head)->tqh_first)
+#define TAILQ_FOREACH_SAFE(var, head, field, tvar) \
+ for ((var) = TAILQ_FIRST((head)); \
+ (var) && ((tvar) = TAILQ_NEXT((var), field), 1); \
+ (var) = (tvar))
-#define TAILQ_LAST(head, headname) \
- (*(((struct headname *)((head)->tqh_last))->tqh_last))
+#define TAILQ_FOREACH_REVERSE(var, head, headname, field) \
+ for ((var) = TAILQ_LAST((head), headname); \
+ (var); \
+ (var) = TAILQ_PREV((var), headname, field))
-#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
+#define TAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, tvar) \
+ for ((var) = TAILQ_LAST((head), headname); \
+ (var) && ((tvar) = TAILQ_PREV((var), headname, field), 1); \
+ (var) = (tvar))
-#define TAILQ_PREV(elm, headname, field) \
- (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
+#if XNU_KERNEL_PRIVATE
+/*
+ * Can be used when the initialized HEAD was just bzeroed
+ * Works around deficiencies in clang analysis of initialization patterns.
+ * See: <rdar://problem/47939050>
+ */
+#define TAILQ_INIT_AFTER_BZERO(head) do { \
+ (head)->tqh_last = &TAILQ_FIRST((head)); \
+} while (0)
+#endif /* XNU_KERNEL_PRIVATE */
-#define TAILQ_INIT(head) do { \
- (head)->tqh_first = NULL; \
- (head)->tqh_last = &(head)->tqh_first; \
+#define TAILQ_INIT(head) do { \
+ TAILQ_FIRST((head)) = NULL; \
+ (head)->tqh_last = &TAILQ_FIRST((head)); \
+ QMD_TRACE_HEAD(head); \
} while (0)
-#define TAILQ_INSERT_HEAD(head, elm, field) do { \
- if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
- (head)->tqh_first->field.tqe_prev = \
- &(elm)->field.tqe_next; \
- else \
- (head)->tqh_last = &(elm)->field.tqe_next; \
- (head)->tqh_first = (elm); \
- (elm)->field.tqe_prev = &(head)->tqh_first; \
+
+#define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
+ TAILQ_CHECK_NEXT(listelm, field); \
+ if ((TAILQ_NEXT((elm), field) = TAILQ_NEXT((listelm), field)) != NULL)\
+ TAILQ_NEXT((elm), field)->field.tqe_prev = \
+ &TAILQ_NEXT((elm), field); \
+ else { \
+ (head)->tqh_last = &TAILQ_NEXT((elm), field); \
+ QMD_TRACE_HEAD(head); \
+ } \
+ TAILQ_NEXT((listelm), field) = (elm); \
+ (elm)->field.tqe_prev = &TAILQ_NEXT((listelm), field); \
+ QMD_TRACE_ELEM(&(elm)->field); \
+ QMD_TRACE_ELEM(&listelm->field); \
} while (0)
-#define TAILQ_INSERT_TAIL(head, elm, field) do { \
- (elm)->field.tqe_next = NULL; \
- (elm)->field.tqe_prev = (head)->tqh_last; \
- *(head)->tqh_last = (elm); \
- (head)->tqh_last = &(elm)->field.tqe_next; \
+#define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
+ TAILQ_CHECK_PREV(listelm, field); \
+ (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
+ TAILQ_NEXT((elm), field) = (listelm); \
+ *(listelm)->field.tqe_prev = (elm); \
+ (listelm)->field.tqe_prev = &TAILQ_NEXT((elm), field); \
+ QMD_TRACE_ELEM(&(elm)->field); \
+ QMD_TRACE_ELEM(&listelm->field); \
} while (0)
-#define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
- if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
- (elm)->field.tqe_next->field.tqe_prev = \
- &(elm)->field.tqe_next; \
- else \
- (head)->tqh_last = &(elm)->field.tqe_next; \
- (listelm)->field.tqe_next = (elm); \
- (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
+#define TAILQ_INSERT_HEAD(head, elm, field) do { \
+ TAILQ_CHECK_HEAD(head, field); \
+ if ((TAILQ_NEXT((elm), field) = TAILQ_FIRST((head))) != NULL) \
+ TAILQ_FIRST((head))->field.tqe_prev = \
+ &TAILQ_NEXT((elm), field); \
+ else \
+ (head)->tqh_last = &TAILQ_NEXT((elm), field); \
+ TAILQ_FIRST((head)) = (elm); \
+ (elm)->field.tqe_prev = &TAILQ_FIRST((head)); \
+ QMD_TRACE_HEAD(head); \
+ QMD_TRACE_ELEM(&(elm)->field); \
} while (0)
-#define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
- (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
- (elm)->field.tqe_next = (listelm); \
- *(listelm)->field.tqe_prev = (elm); \
- (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \
+#define TAILQ_INSERT_TAIL(head, elm, field) do { \
+ TAILQ_NEXT((elm), field) = NULL; \
+ (elm)->field.tqe_prev = (head)->tqh_last; \
+ *(head)->tqh_last = (elm); \
+ (head)->tqh_last = &TAILQ_NEXT((elm), field); \
+ QMD_TRACE_HEAD(head); \
+ QMD_TRACE_ELEM(&(elm)->field); \
} while (0)
-#define TAILQ_REMOVE(head, elm, field) do { \
- if (((elm)->field.tqe_next) != NULL) \
- (elm)->field.tqe_next->field.tqe_prev = \
- (elm)->field.tqe_prev; \
- else \
- (head)->tqh_last = (elm)->field.tqe_prev; \
- *(elm)->field.tqe_prev = (elm)->field.tqe_next; \
+#define TAILQ_LAST(head, headname) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+ (*(((struct headname *)((head)->tqh_last))->tqh_last)) \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
+
+#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
+
+#define TAILQ_PREV(elm, headname, field) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+ (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last)) \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
+
+#define TAILQ_REMOVE(head, elm, field) do { \
+ TAILQ_CHECK_NEXT(elm, field); \
+ TAILQ_CHECK_PREV(elm, field); \
+ if ((TAILQ_NEXT((elm), field)) != NULL) \
+ TAILQ_NEXT((elm), field)->field.tqe_prev = \
+ (elm)->field.tqe_prev; \
+ else { \
+ (head)->tqh_last = (elm)->field.tqe_prev; \
+ QMD_TRACE_HEAD(head); \
+ } \
+ *(elm)->field.tqe_prev = TAILQ_NEXT((elm), field); \
+ TRASHIT((elm)->field.tqe_next); \
+ TRASHIT((elm)->field.tqe_prev); \
+ QMD_TRACE_ELEM(&(elm)->field); \
} while (0)
/*
- * Circular queue definitions.
+ * Why did they switch to spaces for this one macro?
*/
-#define CIRCLEQ_HEAD(name, type) \
-struct name { \
- struct type *cqh_first; /* first element */ \
- struct type *cqh_last; /* last element */ \
-}
+#define TAILQ_SWAP(head1, head2, type, field) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+do { \
+ struct type *swap_first = (head1)->tqh_first; \
+ struct type **swap_last = (head1)->tqh_last; \
+ (head1)->tqh_first = (head2)->tqh_first; \
+ (head1)->tqh_last = (head2)->tqh_last; \
+ (head2)->tqh_first = swap_first; \
+ (head2)->tqh_last = swap_last; \
+ if ((swap_first = (head1)->tqh_first) != NULL) \
+ swap_first->field.tqe_prev = &(head1)->tqh_first; \
+ else \
+ (head1)->tqh_last = &(head1)->tqh_first; \
+ if ((swap_first = (head2)->tqh_first) != NULL) \
+ swap_first->field.tqe_prev = &(head2)->tqh_first; \
+ else \
+ (head2)->tqh_last = &(head2)->tqh_first; \
+} while (0) \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
-#define CIRCLEQ_ENTRY(type) \
-struct { \
- struct type *cqe_next; /* next element */ \
- struct type *cqe_prev; /* previous element */ \
-}
+/*
+ * Circular queue definitions.
+ */
+#define CIRCLEQ_HEAD(name, type) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+struct name { \
+ struct type *cqh_first; /* first element */ \
+ struct type *cqh_last; /* last element */ \
+} \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
+
+#define CIRCLEQ_ENTRY(type) \
+__MISMATCH_TAGS_PUSH \
+__NULLABILITY_COMPLETENESS_PUSH \
+struct { \
+ struct type *cqe_next; /* next element */ \
+ struct type *cqe_prev; /* previous element */ \
+} \
+__NULLABILITY_COMPLETENESS_POP \
+__MISMATCH_TAGS_POP
/*
* Circular queue functions.
*/
+#ifdef KERNEL_PRIVATE
+#define CIRCLEQ_CHECK_HEAD(head, field) do { \
+ if (__improbable( \
+ CIRCLEQ_FIRST((head)) != ((void*)(head)) && \
+ CIRCLEQ_FIRST((head))->field.cqe_prev != ((void*)(head))))\
+ panic("Bad circleq head %p first->prev != head @%u", \
+ (head), __LINE__); \
+} while(0)
+#define CIRCLEQ_CHECK_NEXT(head, elm, field) do { \
+ if (__improbable( \
+ CIRCLEQ_NEXT((elm), field) != ((void*)(head)) && \
+ CIRCLEQ_NEXT((elm), field)->field.cqe_prev != (elm))) \
+ panic("Bad circleq elm %p next->prev != elm @%u", \
+ (elm), __LINE__); \
+} while(0)
+#define CIRCLEQ_CHECK_PREV(head, elm, field) do { \
+ if (__improbable( \
+ CIRCLEQ_PREV((elm), field) != ((void*)(head)) && \
+ CIRCLEQ_PREV((elm), field)->field.cqe_next != (elm))) \
+ panic("Bad circleq elm %p prev->next != elm @%u", \
+ (elm), __LINE__); \
+} while(0)
+#else
+#define CIRCLEQ_CHECK_HEAD(head, field)
+#define CIRCLEQ_CHECK_NEXT(head, elm, field)
+#define CIRCLEQ_CHECK_PREV(head, elm, field)
+#endif /* KERNEL_PRIVATE */
+
#define CIRCLEQ_EMPTY(head) ((head)->cqh_first == (void *)(head))
#define CIRCLEQ_FIRST(head) ((head)->cqh_first)
-#define CIRCLEQ_FOREACH(var, head, field) \
- for((var) = (head)->cqh_first; \
- (var) != (void *)(head); \
+#define CIRCLEQ_FOREACH(var, head, field) \
+ for((var) = (head)->cqh_first; \
+ (var) != (void *)(head); \
(var) = (var)->field.cqe_next)
-#define CIRCLEQ_INIT(head) do { \
- (head)->cqh_first = (void *)(head); \
- (head)->cqh_last = (void *)(head); \
+#define CIRCLEQ_INIT(head) do { \
+ (head)->cqh_first = (void *)(head); \
+ (head)->cqh_last = (void *)(head); \
} while (0)
-#define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
- (elm)->field.cqe_next = (listelm)->field.cqe_next; \
- (elm)->field.cqe_prev = (listelm); \
- if ((listelm)->field.cqe_next == (void *)(head)) \
- (head)->cqh_last = (elm); \
- else \
- (listelm)->field.cqe_next->field.cqe_prev = (elm); \
- (listelm)->field.cqe_next = (elm); \
+#define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
+ CIRCLEQ_CHECK_NEXT(head, listelm, field); \
+ (elm)->field.cqe_next = (listelm)->field.cqe_next; \
+ (elm)->field.cqe_prev = (listelm); \
+ if ((listelm)->field.cqe_next == (void *)(head)) \
+ (head)->cqh_last = (elm); \
+ else \
+ (listelm)->field.cqe_next->field.cqe_prev = (elm); \
+ (listelm)->field.cqe_next = (elm); \
} while (0)
-#define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \
- (elm)->field.cqe_next = (listelm); \
- (elm)->field.cqe_prev = (listelm)->field.cqe_prev; \
- if ((listelm)->field.cqe_prev == (void *)(head)) \
- (head)->cqh_first = (elm); \
- else \
- (listelm)->field.cqe_prev->field.cqe_next = (elm); \
- (listelm)->field.cqe_prev = (elm); \
+#define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \
+ CIRCLEQ_CHECK_PREV(head, listelm, field); \
+ (elm)->field.cqe_next = (listelm); \
+ (elm)->field.cqe_prev = (listelm)->field.cqe_prev; \
+ if ((listelm)->field.cqe_prev == (void *)(head)) \
+ (head)->cqh_first = (elm); \
+ else \
+ (listelm)->field.cqe_prev->field.cqe_next = (elm); \
+ (listelm)->field.cqe_prev = (elm); \
} while (0)
-#define CIRCLEQ_INSERT_HEAD(head, elm, field) do { \
- (elm)->field.cqe_next = (head)->cqh_first; \
- (elm)->field.cqe_prev = (void *)(head); \
- if ((head)->cqh_last == (void *)(head)) \
- (head)->cqh_last = (elm); \
- else \
- (head)->cqh_first->field.cqe_prev = (elm); \
- (head)->cqh_first = (elm); \
+#define CIRCLEQ_INSERT_HEAD(head, elm, field) do { \
+ CIRCLEQ_CHECK_HEAD(head, field); \
+ (elm)->field.cqe_next = (head)->cqh_first; \
+ (elm)->field.cqe_prev = (void *)(head); \
+ if ((head)->cqh_last == (void *)(head)) \
+ (head)->cqh_last = (elm); \
+ else \
+ (head)->cqh_first->field.cqe_prev = (elm); \
+ (head)->cqh_first = (elm); \
} while (0)
-#define CIRCLEQ_INSERT_TAIL(head, elm, field) do { \
- (elm)->field.cqe_next = (void *)(head); \
- (elm)->field.cqe_prev = (head)->cqh_last; \
- if ((head)->cqh_first == (void *)(head)) \
- (head)->cqh_first = (elm); \
- else \
- (head)->cqh_last->field.cqe_next = (elm); \
- (head)->cqh_last = (elm); \
+#define CIRCLEQ_INSERT_TAIL(head, elm, field) do { \
+ (elm)->field.cqe_next = (void *)(head); \
+ (elm)->field.cqe_prev = (head)->cqh_last; \
+ if ((head)->cqh_first == (void *)(head)) \
+ (head)->cqh_first = (elm); \
+ else \
+ (head)->cqh_last->field.cqe_next = (elm); \
+ (head)->cqh_last = (elm); \
} while (0)
#define CIRCLEQ_LAST(head) ((head)->cqh_last)
-#define CIRCLEQ_NEXT(elm,field) ((elm)->field.cqe_next)
-
-#define CIRCLEQ_PREV(elm,field) ((elm)->field.cqe_prev)
-
-#define CIRCLEQ_REMOVE(head, elm, field) do { \
- if ((elm)->field.cqe_next == (void *)(head)) \
- (head)->cqh_last = (elm)->field.cqe_prev; \
- else \
- (elm)->field.cqe_next->field.cqe_prev = \
- (elm)->field.cqe_prev; \
- if ((elm)->field.cqe_prev == (void *)(head)) \
- (head)->cqh_first = (elm)->field.cqe_next; \
- else \
- (elm)->field.cqe_prev->field.cqe_next = \
- (elm)->field.cqe_next; \
+#define CIRCLEQ_NEXT(elm, field) ((elm)->field.cqe_next)
+
+#define CIRCLEQ_PREV(elm, field) ((elm)->field.cqe_prev)
+
+#define CIRCLEQ_REMOVE(head, elm, field) do { \
+ CIRCLEQ_CHECK_NEXT(head, elm, field); \
+ CIRCLEQ_CHECK_PREV(head, elm, field); \
+ if ((elm)->field.cqe_next == (void *)(head)) \
+ (head)->cqh_last = (elm)->field.cqe_prev; \
+ else \
+ (elm)->field.cqe_next->field.cqe_prev = \
+ (elm)->field.cqe_prev; \
+ if ((elm)->field.cqe_prev == (void *)(head)) \
+ (head)->cqh_first = (elm)->field.cqe_next; \
+ else \
+ (elm)->field.cqe_prev->field.cqe_next = \
+ (elm)->field.cqe_next; \
} while (0)
-#ifdef KERNEL
+#ifdef _KERNEL
#if NOTFB31
struct quehead *qh_rlink;
};
-#ifdef __GNUC__
+#ifdef __GNUC__
+#ifdef KERNEL_PRIVATE
+static __inline void
+chkquenext(void *a)
+{
+ struct quehead *element = (struct quehead *)a;
+ if (__improbable(element->qh_link != NULL &&
+ element->qh_link->qh_rlink != element)) {
+ panic("Bad que elm %p next->prev != elm", a);
+ }
+}
+
+static __inline void
+chkqueprev(void *a)
+{
+ struct quehead *element = (struct quehead *)a;
+ if (__improbable(element->qh_rlink != NULL &&
+ element->qh_rlink->qh_link != element)) {
+ panic("Bad que elm %p prev->next != elm", a);
+ }
+}
+#else /* !KERNEL_PRIVATE */
+#define chkquenext(a)
+#define chkqueprev(a)
+#endif /* KERNEL_PRIVATE */
static __inline void
insque(void *a, void *b)
{
- struct quehead *element = a, *head = b;
+ struct quehead *element = (struct quehead *)a,
+ *head = (struct quehead *)b;
+ chkquenext(head);
element->qh_link = head->qh_link;
element->qh_rlink = head;
static __inline void
remque(void *a)
{
- struct quehead *element = a;
+ struct quehead *element = (struct quehead *)a;
+ chkquenext(element);
+ chkqueprev(element);
element->qh_link->qh_rlink = element->qh_rlink;
element->qh_rlink->qh_link = element->qh_link;
#else /* !__GNUC__ */
-void insque(void *a, void *b);
-void remque(void *a);
+void insque(void *a, void *b);
+void remque(void *a);
#endif /* __GNUC__ */
-#endif
-#endif /* KERNEL */
+#endif /* NOTFB31 */
+#endif /* _KERNEL */
#endif /* !_SYS_QUEUE_H_ */
projects / apple / xnu.git / blobdiff