52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SCHED_RCUPDATE_WAIT_H
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#define _LINUX_SCHED_RCUPDATE_WAIT_H
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/*
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* RCU synchronization types and methods:
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*/
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#include <linux/rcupdate.h>
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#include <linux/completion.h>
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/*
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* Structure allowing asynchronous waiting on RCU.
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*/
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struct rcu_synchronize {
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struct rcu_head head;
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struct completion completion;
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};
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void wakeme_after_rcu(struct rcu_head *head);
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void __wait_rcu_gp(bool checktiny, int n, call_rcu_func_t *crcu_array,
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struct rcu_synchronize *rs_array);
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#define _wait_rcu_gp(checktiny, ...) \
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do { \
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call_rcu_func_t __crcu_array[] = { __VA_ARGS__ }; \
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struct rcu_synchronize __rs_array[ARRAY_SIZE(__crcu_array)]; \
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__wait_rcu_gp(checktiny, ARRAY_SIZE(__crcu_array), \
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__crcu_array, __rs_array); \
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} while (0)
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#define wait_rcu_gp(...) _wait_rcu_gp(false, __VA_ARGS__)
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/**
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* synchronize_rcu_mult - Wait concurrently for multiple grace periods
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* @...: List of call_rcu() functions for the flavors to wait on.
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*
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* This macro waits concurrently for multiple flavors of RCU grace periods.
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* For example, synchronize_rcu_mult(call_rcu, call_rcu_bh) would wait
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* on concurrent RCU and RCU-bh grace periods. Waiting on a give SRCU
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* domain requires you to write a wrapper function for that SRCU domain's
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* call_srcu() function, supplying the corresponding srcu_struct.
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*
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* If Tiny RCU, tell _wait_rcu_gp() not to bother waiting for RCU
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* or RCU-bh, given that anywhere synchronize_rcu_mult() can be called
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* is automatically a grace period.
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*/
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#define synchronize_rcu_mult(...) \
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_wait_rcu_gp(IS_ENABLED(CONFIG_TINY_RCU), __VA_ARGS__)
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#endif /* _LINUX_SCHED_RCUPDATE_WAIT_H */
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