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ck_queue: add CK_*_FOREACH_FROM

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This is a variant of CK_*_FOREACH from FreeBSD queue.h which starts
iteration at the specified item.  If the item pointer is NULL, iteration
starts from the beginning of the list.

Upstream commit 74366be35a6f4635f248a3c62d2d23245a4eb0f4.

MFC after:	2 weeks
Sponsored by:	Klara, Inc.
This commit is contained in:
Mark Johnston 2023-02-25 10:21:19 -05:00
parent b739bc9860
commit 6f48a4acbe
1 changed files with 15 additions and 0 deletions
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15
sys/contrib/ck/include/ck_queue.h
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@ -153,6 +153,11 @@ struct { \
(var); \
(var) = CK_SLIST_NEXT((var), field))
#define CK_SLIST_FOREACH_FROM(var, head, field) \
for ((var) = ((var) != NULL ? (var) : CK_SLIST_FIRST((head))); \
(var); \
(var) = CK_SLIST_NEXT((var), field))
#define CK_SLIST_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = CK_SLIST_FIRST(head); \
(var) && ((tvar) = CK_SLIST_NEXT(var, field), 1); \
@ -262,6 +267,11 @@ struct { \
(var); \
(var) = CK_STAILQ_NEXT((var), field))
#define CK_STAILQ_FOREACH_FROM(var, head, field) \
for ((var) = ((var) != NULL ? (var) : CK_STAILQ_FIRST((head))); \
(var); \
(var) = CK_STAILQ_NEXT((var), field))
#define CK_STAILQ_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = CK_STAILQ_FIRST((head)); \
(var) && ((tvar) = \
@ -374,6 +384,11 @@ struct { \
(var); \
(var) = CK_LIST_NEXT((var), field))
#define CK_LIST_FOREACH_FROM(var, head, field) \
for ((var) = ((var) != NULL ? (var) : CK_LIST_FIRST((head))); \
(var); \
(var) = CK_LIST_NEXT((var), field))
#define CK_LIST_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = CK_LIST_FIRST((head)); \
(var) && ((tvar) = CK_LIST_NEXT((var), field), 1); \