forked from Qortal/Brooklyn
2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/*
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* RCU-based infrastructure for lightweight reader-writer locking
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can access it online at
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* http://www.gnu.org/licenses/gpl-2.0.html.
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*
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* Copyright (c) 2015, Red Hat, Inc.
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*
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* Author: Oleg Nesterov <oleg@redhat.com>
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*/
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#ifndef _LINUX_RCU_SYNC_H_
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#define _LINUX_RCU_SYNC_H_
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#include <linux/wait.h>
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#include <linux/rcupdate.h>
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enum rcu_sync_type { RCU_SYNC, RCU_SCHED_SYNC, RCU_BH_SYNC };
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/* Structure to mediate between updaters and fastpath-using readers. */
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struct rcu_sync {
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int gp_state;
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int gp_count;
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wait_queue_head_t gp_wait;
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int cb_state;
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struct rcu_head cb_head;
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enum rcu_sync_type gp_type;
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};
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extern void rcu_sync_lockdep_assert(struct rcu_sync *);
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/**
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* rcu_sync_is_idle() - Are readers permitted to use their fastpaths?
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* @rsp: Pointer to rcu_sync structure to use for synchronization
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*
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* Returns true if readers are permitted to use their fastpaths.
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* Must be invoked within an RCU read-side critical section whose
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* flavor matches that of the rcu_sync struture.
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*/
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static inline bool rcu_sync_is_idle(struct rcu_sync *rsp)
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{
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#ifdef CONFIG_PROVE_RCU
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rcu_sync_lockdep_assert(rsp);
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#endif
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return !rsp->gp_state; /* GP_IDLE */
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}
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extern void rcu_sync_init(struct rcu_sync *, enum rcu_sync_type);
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extern void rcu_sync_enter_start(struct rcu_sync *);
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extern void rcu_sync_enter(struct rcu_sync *);
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extern void rcu_sync_exit(struct rcu_sync *);
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extern void rcu_sync_dtor(struct rcu_sync *);
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#define __RCU_SYNC_INITIALIZER(name, type) { \
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.gp_state = 0, \
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.gp_count = 0, \
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.gp_wait = __WAIT_QUEUE_HEAD_INITIALIZER(name.gp_wait), \
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.cb_state = 0, \
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.gp_type = type, \
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}
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#define __DEFINE_RCU_SYNC(name, type) \
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struct rcu_sync_struct name = __RCU_SYNC_INITIALIZER(name, type)
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#define DEFINE_RCU_SYNC(name) \
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__DEFINE_RCU_SYNC(name, RCU_SYNC)
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#define DEFINE_RCU_SCHED_SYNC(name) \
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__DEFINE_RCU_SYNC(name, RCU_SCHED_SYNC)
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#define DEFINE_RCU_BH_SYNC(name) \
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__DEFINE_RCU_SYNC(name, RCU_BH_SYNC)
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#endif /* _LINUX_RCU_SYNC_H_ */
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