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Implement sleepable RCU mechanism using shared exclusive locks.

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MFC after:	1 week
Sponsored by:	Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2015-12-21 11:03:12 +00:00
parent cee21041cf
commit c094330345
1 changed files with 72 additions and 0 deletions
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72
sys/compat/linuxkpi/common/include/linux/srcu.h Normal file
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/*-
* Copyright (c) 2015 Mellanox Technologies, Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _LINUX_SRCU_H_
#define _LINUX_SRCU_H_
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/sx.h>
struct srcu_struct {
struct sx sx;
};
static inline int
init_srcu_struct(struct srcu_struct *srcu)
{
sx_init(&srcu->sx, "SleepableRCU");
return (0);
}
static inline void
cleanup_srcu_struct(struct srcu_struct *srcu)
{
sx_destroy(&srcu->sx);
}
static inline int
srcu_read_lock(struct srcu_struct *srcu)
{
sx_slock(&srcu->sx);
return (0);
}
static inline void
srcu_read_unlock(struct srcu_struct *srcu, int key)
{
sx_sunlock(&srcu->sx);
}
static inline void
synchronize_srcu(struct srcu_struct *srcu)
{
sx_xlock(&srcu->sx);
sx_xunlock(&srcu->sx);
}
#endif /* _LINUX_SRCU_H_ */