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ccan/list: sync with upstream

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This brings us up-to-date with ccan/list
5dbd87b876434dd703dfcc30cb0503118aac2076
git://git.ozlabs.org/~ccan/ccan

This is a combination of 3 commits from ccan:

    list: add parens to gaurd macro args in LIST_INIT
    ccan/list: Add list_empty_nocheck
    list: trivial: fix typos in list_for_each_off's documentation

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62152 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2018-02-01 08:59:27 +00:00
parent 6eeb0f7ef4
commit 7af65953de
1 changed files with 20 additions and 5 deletions
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25
ccan/list/list.h
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@ -57,7 +57,7 @@ struct list_head
* Example: * Example:
* static struct list_head my_list = LIST_HEAD_INIT(my_list); * static struct list_head my_list = LIST_HEAD_INIT(my_list);
*/ */
#define LIST_HEAD_INIT(name) { { &name.n, &name.n } } #define LIST_HEAD_INIT(name) { { &(name).n, &(name).n } }
/** /**
* LIST_HEAD - define and initialize an empty list_head * LIST_HEAD - define and initialize an empty list_head
@ -237,6 +237,21 @@ static inline int list_empty_nodebug(const struct list_head *h)
} }
#endif #endif
/**
* list_empty_nocheck - is a list empty?
* @h: the list_head
*
* If the list is empty, returns true. This doesn't perform any
* debug check for list consistency, so it can be called without
* locks, racing with the list being modified. This is ok for
* checks where an incorrect result is not an issue (optimized
* bail out path for example).
*/
static inline bool list_empty_nocheck(const struct list_head *h)
{
return h->n.next == &h->n;
}
/** /**
* list_del - delete an entry from an (unknown) linked list. * list_del - delete an entry from an (unknown) linked list.
* @n: the list_node to delete from the list. * @n: the list_node to delete from the list.
@ -647,12 +662,12 @@ static inline void list_prepend_list_(struct list_head *to,
* so you can break and continue as normal. * so you can break and continue as normal.
* *
* WARNING! Being the low-level macro that it is, this wrapper doesn't know * WARNING! Being the low-level macro that it is, this wrapper doesn't know
* nor care about the type of @i. The only assumtion made is that @i points * nor care about the type of @i. The only assumption made is that @i points
* to a chunk of memory that at some @offset, relative to @i, contains a * to a chunk of memory that at some @offset, relative to @i, contains a
* properly filled `struct node_list' which in turn contains pointers to * properly filled `struct list_node' which in turn contains pointers to
* memory chunks and it's turtles all the way down. Whith all that in mind * memory chunks and it's turtles all the way down. With all that in mind
* remember that given the wrong pointer/offset couple this macro will * remember that given the wrong pointer/offset couple this macro will
* happilly churn all you memory untill SEGFAULT stops it, in other words * happily churn all you memory until SEGFAULT stops it, in other words
* caveat emptor. * caveat emptor.
* *
* It is worth mentioning that one of legitimate use-cases for that wrapper * It is worth mentioning that one of legitimate use-cases for that wrapper