| 1 | /* SPDX-License-Identifier: GPL-2.0 |
| 2 | * |
| 3 | * wrapper/list.h |
| 4 | * |
| 5 | * wrapper around linux/list.h. |
| 6 | * |
| 7 | * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 8 | * |
| 9 | * This wrapper code is derived from Linux 3.19.2 include/linux/list.h |
| 10 | * and include/linux/rculist.h, hence the GPLv2 license applied to this |
| 11 | * file. |
| 12 | */ |
| 13 | |
| 14 | #ifndef _LTTNG_WRAPPER_LIST_H |
| 15 | #define _LTTNG_WRAPPER_LIST_H |
| 16 | |
| 17 | #include <linux/list.h> |
| 18 | #include <linux/rculist.h> |
| 19 | |
| 20 | /* |
| 21 | * return the first or the next element in an RCU protected hlist |
| 22 | */ |
| 23 | #define lttng_hlist_first_rcu(head) (*((struct hlist_node __rcu **)(&(head)->first))) |
| 24 | #define lttng_hlist_next_rcu(node) (*((struct hlist_node __rcu **)(&(node)->next))) |
| 25 | #define lttng_hlist_pprev_rcu(node) (*((struct hlist_node __rcu **)((node)->pprev))) |
| 26 | |
| 27 | #define lttng_hlist_entry_safe(ptr, type, member) \ |
| 28 | ({ typeof(ptr) ____ptr = (ptr); \ |
| 29 | ____ptr ? hlist_entry(____ptr, type, member) : NULL; \ |
| 30 | }) |
| 31 | |
| 32 | /** |
| 33 | * lttng_hlist_for_each_entry - iterate over list of given type |
| 34 | * @pos: the type * to use as a loop cursor. |
| 35 | * @head: the head for your list. |
| 36 | * @member: the name of the hlist_node within the struct. |
| 37 | */ |
| 38 | #define lttng_hlist_for_each_entry(pos, head, member) \ |
| 39 | for (pos = lttng_hlist_entry_safe((head)->first, typeof(*(pos)), member);\ |
| 40 | pos; \ |
| 41 | pos = lttng_hlist_entry_safe((pos)->member.next, typeof(*(pos)), member)) |
| 42 | |
| 43 | /** |
| 44 | * lttng_hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry |
| 45 | * @pos: the type * to use as a loop cursor. |
| 46 | * @n: another &struct hlist_node to use as temporary storage |
| 47 | * @head: the head for your list. |
| 48 | * @member: the name of the hlist_node within the struct. |
| 49 | */ |
| 50 | #define lttng_hlist_for_each_entry_safe(pos, n, head, member) \ |
| 51 | for (pos = lttng_hlist_entry_safe((head)->first, typeof(*pos), member);\ |
| 52 | pos && ({ n = pos->member.next; 1; }); \ |
| 53 | pos = lttng_hlist_entry_safe(n, typeof(*pos), member)) |
| 54 | |
| 55 | #endif /* _LTTNG_WRAPPER_LIST_H */ |