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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 | */ | |
14 | struct rcu_synchronize { | |
15 | struct rcu_head head; | |
16 | struct completion completion; | |
17 | }; | |
18 | void wakeme_after_rcu(struct rcu_head *head); | |
19 | ||
20 | void __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, ...) \ | |
24 | do { \ | |
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 */ |