2ef34e9086
- add rm_try_rlock(). - add RM_SLEEPABLE to use sx(9) as the back-end lock in order to sleep while holding the write lock. - change rm_noreadtoken to a cpu bitmask to indicate which CPUs need to go through the lock/unlock in order to synchronize. As a side effect, this also avoids IPI to CPUs without any readers during rm_wlock. Discussed with: ups@, rwatson@ on arch@ Sponsored by: Isilon Systems, Inc.
128 lines
4.4 KiB
C
128 lines
4.4 KiB
C
/*-
|
|
* Copyright (c) 2007 Stephan Uphoff <ups@FreeBSD.org>
|
|
* 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, 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.
|
|
* 3. Neither the name of the author nor the names of any co-contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 _SYS_RMLOCK_H_
|
|
#define _SYS_RMLOCK_H_
|
|
|
|
#include <sys/mutex.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/_lock.h>
|
|
#include <sys/_rmlock.h>
|
|
|
|
#ifdef _KERNEL
|
|
|
|
/*
|
|
* Flags passed to rm_init(9).
|
|
*/
|
|
#define RM_NOWITNESS 0x00000001
|
|
#define RM_RECURSE 0x00000002
|
|
#define RM_SLEEPABLE 0x00000004
|
|
|
|
void rm_init(struct rmlock *rm, const char *name);
|
|
void rm_init_flags(struct rmlock *rm, const char *name, int opts);
|
|
void rm_destroy(struct rmlock *rm);
|
|
int rm_wowned(struct rmlock *rm);
|
|
void rm_sysinit(void *arg);
|
|
void rm_sysinit_flags(void *arg);
|
|
|
|
void _rm_wlock_debug(struct rmlock *rm, const char *file, int line);
|
|
void _rm_wunlock_debug(struct rmlock *rm, const char *file, int line);
|
|
int _rm_rlock_debug(struct rmlock *rm, struct rm_priotracker *tracker,
|
|
int trylock, const char *file, int line);
|
|
void _rm_runlock_debug(struct rmlock *rm, struct rm_priotracker *tracker,
|
|
const char *file, int line);
|
|
|
|
void _rm_wlock(struct rmlock *rm);
|
|
void _rm_wunlock(struct rmlock *rm);
|
|
int _rm_rlock(struct rmlock *rm, struct rm_priotracker *tracker,
|
|
int trylock);
|
|
void _rm_runlock(struct rmlock *rm, struct rm_priotracker *tracker);
|
|
|
|
/*
|
|
* Public interface for lock operations.
|
|
*/
|
|
#ifndef LOCK_DEBUG
|
|
#error LOCK_DEBUG not defined, include <sys/lock.h> before <sys/rmlock.h>
|
|
#endif
|
|
|
|
#if LOCK_DEBUG > 0
|
|
#define rm_wlock(rm) _rm_wlock_debug((rm), LOCK_FILE, LOCK_LINE)
|
|
#define rm_wunlock(rm) _rm_wunlock_debug((rm), LOCK_FILE, LOCK_LINE)
|
|
#define rm_rlock(rm,tracker) \
|
|
((void)_rm_rlock_debug((rm),(tracker), 0, LOCK_FILE, LOCK_LINE ))
|
|
#define rm_try_rlock(rm,tracker) \
|
|
_rm_rlock_debug((rm),(tracker), 1, LOCK_FILE, LOCK_LINE )
|
|
#define rm_runlock(rm,tracker) \
|
|
_rm_runlock_debug((rm), (tracker), LOCK_FILE, LOCK_LINE )
|
|
#else
|
|
#define rm_wlock(rm) _rm_wlock((rm))
|
|
#define rm_wunlock(rm) _rm_wunlock((rm))
|
|
#define rm_rlock(rm,tracker) ((void)_rm_rlock((rm),(tracker), 0))
|
|
#define rm_try_rlock(rm,tracker) _rm_rlock((rm),(tracker), 1)
|
|
#define rm_runlock(rm,tracker) _rm_runlock((rm), (tracker))
|
|
#endif
|
|
|
|
struct rm_args {
|
|
struct rmlock *ra_rm;
|
|
const char *ra_desc;
|
|
};
|
|
|
|
struct rm_args_flags {
|
|
struct rmlock *ra_rm;
|
|
const char *ra_desc;
|
|
int ra_opts;
|
|
};
|
|
|
|
#define RM_SYSINIT(name, rm, desc) \
|
|
static struct rm_args name##_args = { \
|
|
(rm), \
|
|
(desc), \
|
|
}; \
|
|
SYSINIT(name##_rm_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
|
|
rm_sysinit, &name##_args); \
|
|
SYSUNINIT(name##_rm_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
|
|
rm_destroy, (rm))
|
|
|
|
|
|
#define RM_SYSINIT_FLAGS(name, rm, desc, opts) \
|
|
static struct rm_args name##_args = { \
|
|
(rm), \
|
|
(desc), \
|
|
(opts), \
|
|
}; \
|
|
SYSINIT(name##_rm_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
|
|
rm_sysinit_flags, &name##_args); \
|
|
SYSUNINIT(name##_rm_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
|
|
rm_destroy, (rm))
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* !_SYS_RMLOCK_H_ */
|