67 lines
2.2 KiB
C
67 lines
2.2 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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* 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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#ifndef _LINUX_SEMAPHORE_H_
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#define _LINUX_SEMAPHORE_H_
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/sema.h>
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/*
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* XXX BSD semaphores are disused and slow. They also do not provide a
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* sema_wait_sig method. This must be resolved eventually.
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*/
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struct semaphore {
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struct sema sema;
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};
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#define down(_sem) sema_wait(&(_sem)->sema)
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#define down_interruptible(_sem) sema_wait(&(_sem)->sema), 0
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#define down_trylock(_sem) !sema_trywait(&(_sem)->sema)
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#define up(_sem) sema_post(&(_sem)->sema)
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static inline void
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linux_sema_init(struct semaphore *sem, int val)
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{
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memset(&sem->sema, 0, sizeof(sem->sema));
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sema_init(&sem->sema, val, "lnxsema");
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}
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static inline void
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init_MUTEX(struct semaphore *sem)
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{
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memset(&sem->sema, 0, sizeof(sem->sema));
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sema_init(&sem->sema, 1, "lnxsema");
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}
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#define sema_init linux_sema_init
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#endif /* _LINUX_SEMAPHORE_H_ */
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