Linux kernel mirror (for testing)
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1#ifndef _LINUX_SCHED_RCUPDATE_WAIT_H
2#define _LINUX_SCHED_RCUPDATE_WAIT_H
3
4/*
5 * RCU synchronization types and methods:
6 */
7
8#include <linux/rcupdate.h>
9#include <linux/completion.h>
10
11/*
12 * Structure allowing asynchronous waiting on RCU.
13 */
14struct rcu_synchronize {
15 struct rcu_head head;
16 struct completion completion;
17};
18void wakeme_after_rcu(struct rcu_head *head);
19
20void __wait_rcu_gp(bool checktiny, int n, call_rcu_func_t *crcu_array,
21 struct rcu_synchronize *rs_array);
22
23#define _wait_rcu_gp(checktiny, ...) \
24do { \
25 call_rcu_func_t __crcu_array[] = { __VA_ARGS__ }; \
26 struct rcu_synchronize __rs_array[ARRAY_SIZE(__crcu_array)]; \
27 __wait_rcu_gp(checktiny, ARRAY_SIZE(__crcu_array), \
28 __crcu_array, __rs_array); \
29} while (0)
30
31#define wait_rcu_gp(...) _wait_rcu_gp(false, __VA_ARGS__)
32
33/**
34 * synchronize_rcu_mult - Wait concurrently for multiple grace periods
35 * @...: List of call_rcu() functions for the flavors to wait on.
36 *
37 * This macro waits concurrently for multiple flavors of RCU grace periods.
38 * For example, synchronize_rcu_mult(call_rcu, call_rcu_bh) would wait
39 * on concurrent RCU and RCU-bh grace periods. Waiting on a give SRCU
40 * domain requires you to write a wrapper function for that SRCU domain's
41 * call_srcu() function, supplying the corresponding srcu_struct.
42 *
43 * If Tiny RCU, tell _wait_rcu_gp() not to bother waiting for RCU
44 * or RCU-bh, given that anywhere synchronize_rcu_mult() can be called
45 * is automatically a grace period.
46 */
47#define synchronize_rcu_mult(...) \
48 _wait_rcu_gp(IS_ENABLED(CONFIG_TINY_RCU), __VA_ARGS__)
49
50#endif /* _LINUX_SCHED_RCUPDATE_WAIT_H */