1 #ifndef _LTTNG_WRAPPER_RCU_H
2 #define _LTTNG_WRAPPER_RCU_H
7 * wrapper around linux/rcupdate.h and linux/rculist.h.
9 * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * This library is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; only
14 * version 2.1 of the License.
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this library; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include <linux/version.h>
27 #include <linux/rculist.h>
28 #include <linux/rcupdate.h>
29 #include <wrapper/list.h>
31 #ifndef rcu_dereference_raw_notrace
32 #define rcu_dereference_raw_notrace(p) rcu_dereference_raw(p)
35 #define lttng_rcu_dereference(p) rcu_dereference_raw_notrace(p)
38 * lttng_list_entry_rcu - get the struct for this entry
39 * @ptr: the &struct list_head pointer.
40 * @type: the type of the struct this is embedded in.
41 * @member: the name of the list_head within the struct.
43 * This primitive may safely run concurrently with the _rcu list-mutation
44 * primitives such as list_add_rcu() as long as it's guarded by
45 * rcu_read_lock_sched().
46 * Can be used while tracing RCU.
48 #define lttng_list_entry_rcu(ptr, type, member) \
50 typeof(*ptr) __rcu *__ptr = (typeof(*ptr) __rcu __force *)ptr; \
51 container_of((typeof(ptr))lttng_rcu_dereference(__ptr), type, member); \
55 * lttng_list_for_each_entry_rcu - iterate over rcu list of given type
56 * @pos: the type * to use as a loop cursor.
57 * @head: the head for your list.
58 * @member: the name of the list_head within the struct.
60 * This list-traversal primitive may safely run concurrently with
61 * the _rcu list-mutation primitives such as list_add_rcu()
62 * as long as the traversal is guarded by rcu_read_lock_sched().
63 * Can be used while tracing RCU.
65 #define lttng_list_for_each_entry_rcu(pos, head, member) \
66 for (pos = lttng_list_entry_rcu((head)->next, typeof(*pos), member); \
67 &pos->member != (head); \
68 pos = lttng_list_entry_rcu(pos->member.next, typeof(*pos), member))
71 * lttng_hlist_for_each_entry_rcu - iterate over rcu list of given type (for tracing)
72 * @pos: the type * to use as a loop cursor.
73 * @head: the head for your list.
74 * @member: the name of the hlist_node within the struct.
76 * This list-traversal primitive may safely run concurrently with
77 * the _rcu list-mutation primitives such as hlist_add_head_rcu()
78 * as long as the traversal is guarded by rcu_read_lock().
80 * This is the same as hlist_for_each_entry_rcu() except that it does
81 * not do any RCU debugging or tracing.
83 #define lttng_hlist_for_each_entry_rcu(pos, head, member) \
84 for (pos = lttng_hlist_entry_safe (lttng_rcu_dereference(lttng_hlist_first_rcu(head)), \
85 typeof(*(pos)), member); \
87 pos = lttng_hlist_entry_safe(lttng_rcu_dereference(lttng_hlist_next_rcu( \
88 &(pos)->member)), typeof(*(pos)), member))
90 #endif /* _LTTNG_WRAPPER_RCU_H */
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