83 lines
3.0 KiB
C
83 lines
3.0 KiB
C
/*-
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* Copyright (c) 2010 Isilon Systems, Inc.
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* Copyright (c) 2010 iX Systems, Inc.
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* Copyright (c) 2010 Panasas, Inc.
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* Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUX_RWSEM_H_
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#define _LINUX_RWSEM_H_
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/sx.h>
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#include <sys/libkern.h>
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#include <sys/kernel.h>
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struct rw_semaphore {
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struct sx sx;
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};
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#define down_write(_rw) sx_xlock(&(_rw)->sx)
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#define up_write(_rw) sx_xunlock(&(_rw)->sx)
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#define down_read(_rw) sx_slock(&(_rw)->sx)
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#define up_read(_rw) sx_sunlock(&(_rw)->sx)
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#define down_read_trylock(_rw) !!sx_try_slock(&(_rw)->sx)
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#define down_write_trylock(_rw) !!sx_try_xlock(&(_rw)->sx)
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#define down_write_killable(_rw) !!sx_xlock_sig(&(_rw)->sx)
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#define downgrade_write(_rw) sx_downgrade(&(_rw)->sx)
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#define down_read_nested(_rw, _sc) down_read(_rw)
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#define init_rwsem(_rw) linux_init_rwsem(_rw, rwsem_name("lnxrwsem"))
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#ifdef WITNESS_ALL
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/* NOTE: the maximum WITNESS name is 64 chars */
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#define __rwsem_name(name, file, line) \
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(((const char *){file ":" #line "-" name}) + \
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(sizeof(file) > 16 ? sizeof(file) - 16 : 0))
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#else
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#define __rwsem_name(name, file, line) name
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#endif
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#define _rwsem_name(...) __rwsem_name(__VA_ARGS__)
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#define rwsem_name(name) _rwsem_name(name, __FILE__, __LINE__)
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#define DECLARE_RWSEM(name) \
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struct rw_semaphore name; \
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static void name##_rwsem_init(void *arg) \
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{ \
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linux_init_rwsem(&name, rwsem_name(#name)); \
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} \
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SYSINIT(name, SI_SUB_LOCK, SI_ORDER_SECOND, name##_rwsem_init, NULL)
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static inline void
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linux_init_rwsem(struct rw_semaphore *rw, const char *name)
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{
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memset(rw, 0, sizeof(*rw));
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sx_init_flags(&rw->sx, name, SX_NOWITNESS);
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}
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#endif /* _LINUX_RWSEM_H_ */
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