82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
/*-
|
|
* Copyright (c) 2010 Isilon Systems, Inc.
|
|
* Copyright (c) 2010 iX Systems, Inc.
|
|
* Copyright (c) 2010 Panasas, Inc.
|
|
* Copyright (c) 2013-2017 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_RWSEM_H_
|
|
#define _LINUX_RWSEM_H_
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/libkern.h>
|
|
#include <sys/kernel.h>
|
|
|
|
struct rw_semaphore {
|
|
struct sx sx;
|
|
};
|
|
|
|
#define down_write(_rw) sx_xlock(&(_rw)->sx)
|
|
#define up_write(_rw) sx_xunlock(&(_rw)->sx)
|
|
#define down_read(_rw) sx_slock(&(_rw)->sx)
|
|
#define up_read(_rw) sx_sunlock(&(_rw)->sx)
|
|
#define down_read_trylock(_rw) !!sx_try_slock(&(_rw)->sx)
|
|
#define down_write_trylock(_rw) !!sx_try_xlock(&(_rw)->sx)
|
|
#define downgrade_write(_rw) sx_downgrade(&(_rw)->sx)
|
|
#define down_read_nested(_rw, _sc) down_read(_rw)
|
|
#define init_rwsem(_rw) linux_init_rwsem(_rw, rwsem_name("lnxrwsem"))
|
|
|
|
#ifdef WITNESS_ALL
|
|
/* NOTE: the maximum WITNESS name is 64 chars */
|
|
#define __rwsem_name(name, file, line) \
|
|
(((const char *){file ":" #line "-" name}) + \
|
|
(sizeof(file) > 16 ? sizeof(file) - 16 : 0))
|
|
#else
|
|
#define __rwsem_name(name, file, line) name
|
|
#endif
|
|
#define _rwsem_name(...) __rwsem_name(__VA_ARGS__)
|
|
#define rwsem_name(name) _rwsem_name(name, __FILE__, __LINE__)
|
|
|
|
#define DECLARE_RWSEM(name) \
|
|
struct rw_semaphore name; \
|
|
static void name##_rwsem_init(void *arg) \
|
|
{ \
|
|
linux_init_rwsem(&name, rwsem_name(#name)); \
|
|
} \
|
|
SYSINIT(name, SI_SUB_LOCK, SI_ORDER_SECOND, name##_rwsem_init, NULL)
|
|
|
|
static inline void
|
|
linux_init_rwsem(struct rw_semaphore *rw, const char *name)
|
|
{
|
|
|
|
memset(rw, 0, sizeof(*rw));
|
|
sx_init_flags(&rw->sx, name, SX_NOWITNESS);
|
|
}
|
|
|
|
#endif /* _LINUX_RWSEM_H_ */
|