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/*
* include/haproxy/list-t.h
* Circular list manipulation types definitions
*
* Copyright (C) 2002-2020 Willy Tarreau - w@1wt.eu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _HAPROXY_LIST_T_H
#define _HAPROXY_LIST_T_H
/* these are circular or bidirectionnal lists only. Each list pointer points to
* another list pointer in a structure, and not the structure itself. The
* pointer to the next element MUST be the first one so that the list is easily
* cast as a single linked list or pointer.
*/
struct list {
struct list *n; /* next */
struct list *p; /* prev */
};
/* This is similar to struct list, but we want to be sure the compiler will
* yell at you if you use macroes for one when you're using the other. You have
* to expicitely cast if that's really what you want to do.
*/
struct mt_list {
struct mt_list *next;
struct mt_list *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 */
};
/* a word list is a generic list with a pointer to a string in each element. */
struct wordlist {
struct list list;
char *s;
};
/* this is the same as above with an additional pointer to a condition. */
struct cond_wordlist {
struct list list;
void *cond;
char *s;
};
#endif /* _HAPROXY_LIST_T_H */
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