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author | Joel Sherrill <joel.sherrill@oarcorp.com> | 2012-03-08 07:25:21 -0600 |
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committer | Joel Sherrill <joel.sherrill@oarcorp.com> | 2012-03-08 07:25:21 -0600 |
commit | e2d2bf579b8d9ac67c1fdf0ad419b22860b93b35 (patch) | |
tree | 4f285040086226090aa9f664e011ffd8ced0a03a /freebsd/sys/refcount.h | |
parent | Add wish list for freebsd-to-rtems.py (diff) | |
download | rtems-libbsd-e2d2bf579b8d9ac67c1fdf0ad419b22860b93b35.tar.bz2 |
Move rtems/freebsd to freebsd and contrib to freebsd/contrib
Diffstat (limited to 'freebsd/sys/refcount.h')
-rw-r--r-- | freebsd/sys/refcount.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/freebsd/sys/refcount.h b/freebsd/sys/refcount.h new file mode 100644 index 00000000..57e97b41 --- /dev/null +++ b/freebsd/sys/refcount.h @@ -0,0 +1,68 @@ +/*- + * Copyright (c) 2005 John Baldwin <jhb@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_REFCOUNT_HH__ +#define __SYS_REFCOUNT_HH__ + +#include <rtems/freebsd/machine/atomic.h> + +#ifdef _KERNEL +#include <rtems/freebsd/sys/systm.h> +#else +#define KASSERT(exp, msg) /* */ +#endif + +static __inline void +refcount_init(volatile u_int *count, u_int value) +{ + + *count = value; +} + +static __inline void +refcount_acquire(volatile u_int *count) +{ + + atomic_add_acq_int(count, 1); +} + +static __inline int +refcount_release(volatile u_int *count) +{ + u_int old; + + /* XXX: Should this have a rel membar? */ + old = atomic_fetchadd_int(count, -1); + KASSERT(old > 0, ("negative refcount %p", count)); + return (old == 1); +} + +#endif /* ! __SYS_REFCOUNT_HH__ */ |