58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/* $OpenBSD: refcnt.h,v 1.12 2023/08/28 14:50:02 bluhm Exp $ */
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/*
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* Copyright (c) 2015 David Gwynne <dlg@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _SYS_REFCNT_H_
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#define _SYS_REFCNT_H_
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/*
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* Locks used to protect struct members in this file:
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* I immutable after creation
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* a atomic operations
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*/
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struct refcnt {
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unsigned int r_refs; /* [a] reference counter */
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int r_traceidx; /* [I] index for dt(4) tracing */
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};
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#define REFCNT_INITIALIZER() { .r_refs = 1, .r_traceidx = 0 }
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#ifdef _KERNEL
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void refcnt_init(struct refcnt *);
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void refcnt_init_trace(struct refcnt *, int id);
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void refcnt_take(struct refcnt *);
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int refcnt_rele(struct refcnt *);
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void refcnt_rele_wake(struct refcnt *);
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void refcnt_finalize(struct refcnt *, const char *);
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int refcnt_shared(struct refcnt *);
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unsigned int refcnt_read(struct refcnt *);
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/* sorted alphabetically, keep in sync with dev/dt/dt_prov_static.c */
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#define DT_REFCNT_IDX_ETHMULTI 1
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#define DT_REFCNT_IDX_IFADDR 2
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#define DT_REFCNT_IDX_IFMADDR 3
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#define DT_REFCNT_IDX_INPCB 4
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#define DT_REFCNT_IDX_RTENTRY 5
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#define DT_REFCNT_IDX_SYNCACHE 6
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#define DT_REFCNT_IDX_TDB 7
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#endif /* _KERNEL */
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#endif /* _SYS_REFCNT_H_ */
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