Date: Sun, 20 Aug 2023 05:05:40 GMT
From: Colin Percival <cperciva@FreeBSD.org>
To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org
Subject: git: 79fafc09740a - main - queue.h: Define {LIST,TAILQ}_REMOVE_HEAD
Message-ID: <202308200505.37K55e2d000261@gitrepo.freebsd.org>
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The branch main has been updated by cperciva: URL: https://cgit.FreeBSD.org/src/commit/?id=79fafc09740ad508b40e909dc898cbac2d4f67c4 commit 79fafc09740ad508b40e909dc898cbac2d4f67c4 Author: Colin Percival <cperciva@FreeBSD.org> AuthorDate: 2023-07-17 23:42:50 +0000 Commit: Colin Percival <cperciva@FreeBSD.org> CommitDate: 2023-08-20 05:04:55 +0000 queue.h: Define {LIST,TAILQ}_REMOVE_HEAD The LIST and TAILQ structures have fast _REMOVE macros (since each element has a pointer to the previous element); we implement the _REMOVE_HEAD macros for them by simply finding the first element and then removing it. Reviewed by: jhb, emaste Sponsored by: https://www.patreon.com/cperciva Differential Revision: https://reviews.freebsd.org/D41072 --- sys/sys/queue.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/sys/sys/queue.h b/sys/sys/queue.h index 8e91ebf7949d..47d85121e317 100644 --- a/sys/sys/queue.h +++ b/sys/sys/queue.h @@ -110,7 +110,7 @@ * _INSERT_TAIL - - + + * _CONCAT s s + + * _REMOVE_AFTER + - + - - * _REMOVE_HEAD + - + - + * _REMOVE_HEAD + + + + * _REMOVE s + s + * _SWAP + + + + * @@ -595,6 +595,9 @@ struct { \ __containerof((elm)->field.le_prev, \ QUEUE_TYPEOF(type), field.le_next)) +#define LIST_REMOVE_HEAD(head, field) \ + LIST_REMOVE(LIST_FIRST(head), field) + #define LIST_REMOVE(elm, field) do { \ QMD_SAVELINK(oldnext, (elm)->field.le_next); \ QMD_SAVELINK(oldprev, (elm)->field.le_prev); \ @@ -841,6 +844,9 @@ struct { \ ((elm)->field.tqe_prev == &(head)->tqh_first ? NULL : \ __containerof((elm)->field.tqe_prev, QUEUE_TYPEOF(type), field.tqe_next)) +#define TAILQ_REMOVE_HEAD(head, field) \ + TAILQ_REMOVE(head, TAILQ_FIRST(head), field) + #define TAILQ_REMOVE(head, elm, field) do { \ QMD_SAVELINK(oldnext, (elm)->field.tqe_next); \ QMD_SAVELINK(oldprev, (elm)->field.tqe_prev); \
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