diff options
Diffstat (limited to 'sys/sys/refcnt.h')
-rw-r--r-- | sys/sys/refcnt.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/sys/sys/refcnt.h b/sys/sys/refcnt.h new file mode 100644 index 0000000..85e84cf --- /dev/null +++ b/sys/sys/refcnt.h @@ -0,0 +1,38 @@ +/* $OpenBSD: refcnt.h,v 1.4 2016/06/07 07:53:33 mpi Exp $ */ + +/* + * Copyright (c) 2015 David Gwynne <dlg@openbsd.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#ifndef _SYS_REFCNT_H_ +#define _SYS_REFCNT_H_ + +struct refcnt { + unsigned int refs; +}; + +#define REFCNT_INITIALIZER() { .refs = 1 } + +#ifdef _KERNEL + +void refcnt_init(struct refcnt *); +void refcnt_take(struct refcnt *); +int refcnt_rele(struct refcnt *); +void refcnt_rele_wake(struct refcnt *); +void refcnt_finalize(struct refcnt *, const char *); + +#endif /* _KERNEL */ + +#endif /* _SYS_REFCNT_H_ */ |