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[MINOR] add a new back-reference type : struct bref

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This type will be used to maintain back-references to items which
are subject to move between accesses. Typical usage includes session
removal during a listing.
This commit is contained in:
Willy Tarreau 2008-12-07 20:00:15 +01:00
parent 0a46489228
commit bc04ce7cd9
1 changed files with 14 additions and 0 deletions
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14
include/common/mini-clist.h
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@ -19,6 +19,20 @@ struct list {
struct list *p; /* prev */ struct list *p; /* prev */
}; };
/* a back-ref is a pointer to a target list entry. It is used to detect when an
* element being deleted is currently being tracked by another user. The best
* example is a user dumping the session table. The table does not fit in the
* output buffer so we have to set a mark on a session and go on later. But if
* that marked session gets deleted, we don't want the user's pointer to go in
* the wild. So we can simply link this user's request to the list of this
* session's users, and put a pointer to the list element in ref, that will be
* used as the mark for next iteration.
*/
struct bref {
struct list users;
struct list *ref; /* pointer to the target's list entry */
};
/* First undefine some macros which happen to also be defined on OpenBSD, /* First undefine some macros which happen to also be defined on OpenBSD,
* in sys/queue.h, used by sys/event.h * in sys/queue.h, used by sys/event.h
*/ */