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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354/* SPDX-License-Identifier: GPL-2.0+ *//* * RCU-based infrastructure for lightweight reader-writer locking * * Copyright (c) 2015, Red Hat, Inc. * * Author: Oleg Nesterov <oleg@redhat.com> */
#ifndef _LINUX_RCU_SYNC_H_#define _LINUX_RCU_SYNC_H_
#include <linux/wait.h>#include <linux/rcupdate.h>
/* Structure to mediate between updaters and fastpath-using readers. */struct rcu_sync { int gp_state; int gp_count; wait_queue_head_t gp_wait;
struct rcu_head cb_head;};
/** * rcu_sync_is_idle() - Are readers permitted to use their fastpaths? * @rsp: Pointer to rcu_sync structure to use for synchronization * * Returns true if readers are permitted to use their fastpaths. Must be * invoked within some flavor of RCU read-side critical section. */static inline bool rcu_sync_is_idle(struct rcu_sync *rsp){ RCU_LOCKDEP_WARN(!rcu_read_lock_any_held(), "suspicious rcu_sync_is_idle() usage"); return !READ_ONCE(rsp->gp_state); /* GP_IDLE */}
extern void rcu_sync_init(struct rcu_sync *);extern void rcu_sync_enter(struct rcu_sync *);extern void rcu_sync_exit(struct rcu_sync *);extern void rcu_sync_dtor(struct rcu_sync *);
#define __RCU_SYNC_INITIALIZER(name) { \ .gp_state = 0, \ .gp_count = 0, \ .gp_wait = __WAIT_QUEUE_HEAD_INITIALIZER(name.gp_wait), \ }
#define DEFINE_RCU_SYNC(name) \ struct rcu_sync name = __RCU_SYNC_INITIALIZER(name)
#endif /* _LINUX_RCU_SYNC_H_ */