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/* SPDX-License-Identifier: GPL-2.0-only
*
* wrapper/list.h
*
* wrapper around linux/list.h.
*
* Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* This wrapper code is derived from Linux 3.19.2 include/linux/list.h
* and include/linux/rculist.h, hence the GPLv2 license applied to this
* file.
*/
#ifndef _LTTNG_WRAPPER_LIST_H
#define _LTTNG_WRAPPER_LIST_H
#include <linux/list.h>
#include <linux/rculist.h>
/*
* return the first or the next element in an RCU protected hlist
*/
#define lttng_hlist_first_rcu(head) (*((struct hlist_node __rcu **)(&(head)->first)))
#define lttng_hlist_next_rcu(node) (*((struct hlist_node __rcu **)(&(node)->next)))
#define lttng_hlist_pprev_rcu(node) (*((struct hlist_node __rcu **)((node)->pprev)))
#define lttng_hlist_entry_safe(ptr, type, member) \
({ typeof(ptr) ____ptr = (ptr); \
____ptr ? hlist_entry(____ptr, type, member) : NULL; \
})
/**
* lttng_hlist_for_each_entry - iterate over list of given type
* @pos: the type * to use as a loop cursor.
* @head: the head for your list.
* @member: the name of the hlist_node within the struct.
*/
#define lttng_hlist_for_each_entry(pos, head, member) \
for (pos = lttng_hlist_entry_safe((head)->first, typeof(*(pos)), member);\
pos; \
pos = lttng_hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
/**
* lttng_hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry
* @pos: the type * to use as a loop cursor.
* @n: another &struct hlist_node to use as temporary storage
* @head: the head for your list.
* @member: the name of the hlist_node within the struct.
*/
#define lttng_hlist_for_each_entry_safe(pos, n, head, member) \
for (pos = lttng_hlist_entry_safe((head)->first, typeof(*pos), member);\
pos && ({ n = pos->member.next; 1; }); \
pos = lttng_hlist_entry_safe(n, typeof(*pos), member))
#endif /* _LTTNG_WRAPPER_LIST_H */
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