87f02f6f89
C11 atomics now work on all the architectures. Have at least a single piece of software in our base system that uses C11 atomics. This somewhat makes it less likely that we break it because of LLVM imports, etc.
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/*-
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* Copyright (c) 2005 John Baldwin <jhb@FreeBSD.org>
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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, this list of conditions and the following 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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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef __REFCNT_H__
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#define __REFCNT_H__
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#include <stdatomic.h>
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#include "pjdlog.h"
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typedef atomic_uint refcnt_t;
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static __inline void
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refcnt_init(refcnt_t *count, unsigned int v)
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{
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atomic_init(count, v);
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}
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static __inline void
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refcnt_acquire(refcnt_t *count)
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{
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atomic_fetch_add_explicit(count, 1, memory_order_acquire);
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}
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static __inline unsigned int
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refcnt_release(refcnt_t *count)
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{
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unsigned int old;
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/* XXX: Should this have a rel membar? */
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old = atomic_fetch_sub(count, 1);
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PJDLOG_ASSERT(old > 0);
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return (old - 1);
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}
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#endif /* ! __REFCNT_H__ */
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