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Add TAILQ_FOREACH_REVERSE() macro.

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Submitted by:	Jake Burkholder <jburkhol@home.com>
This commit is contained in:
Archie Cobbs 2000-05-01 18:17:14 +00:00
parent 7892318c65
commit 2be85d6dac
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=59861
1 changed files with 7 additions and 1 deletions
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8
sys/sys/queue.h
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@ -74,7 +74,7 @@
* linked so that an arbitrary element can be removed without a need to * 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 * 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 * 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 * 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 * list and the other to the tail of the list. The elements are doubly
@ -97,6 +97,7 @@
* _PREV - - - + + * _PREV - - - + +
* _LAST - - + + + * _LAST - - + + +
* _FOREACH + + + + + * _FOREACH + + + + +
* _FOREACH_REVERSE - - - + +
* _INSERT_HEAD + + + + + * _INSERT_HEAD + + + + +
* _INSERT_BEFORE - + - + + * _INSERT_BEFORE - + - + +
* _INSERT_AFTER + + + + + * _INSERT_AFTER + + + + +
@ -332,6 +333,11 @@ struct { \
#define TAILQ_FOREACH(var, head, field) \ #define TAILQ_FOREACH(var, head, field) \
for (var = TAILQ_FIRST(head); var; var = TAILQ_NEXT(var, field)) for (var = TAILQ_FIRST(head); var; var = TAILQ_NEXT(var, field))
#define TAILQ_FOREACH_REVERSE(var, head, headname, field) \
for ((var) = TAILQ_LAST((head), headname); \
(var); \
(var) = TAILQ_PREV((var), headname, field))
#define TAILQ_FIRST(head) ((head)->tqh_first) #define TAILQ_FIRST(head) ((head)->tqh_first)
#define TAILQ_LAST(head, headname) \ #define TAILQ_LAST(head, headname) \