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105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _SYS_REFCOUNT_H
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#define _SYS_REFCOUNT_H
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#pragma ident "%Z%%M% %I% %E% SMI"
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#include <sys/inttypes.h>
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#include <sys/list.h>
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#include <sys/zfs_context.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* If the reference is held only by the calling function and not any
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* particular object, use FTAG (which is a string) for the holder_tag.
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* Otherwise, use the object that holds the reference.
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*/
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#define FTAG ((char *)__func__)
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#if defined(DEBUG) || !defined(_KERNEL)
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typedef struct reference {
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list_node_t ref_link;
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void *ref_holder;
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uint64_t ref_number;
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uint8_t *ref_removed;
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} reference_t;
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typedef struct refcount {
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kmutex_t rc_mtx;
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list_t rc_list;
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list_t rc_removed;
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int64_t rc_count;
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int64_t rc_removed_count;
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} refcount_t;
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/* Note: refcount_t must be initialized with refcount_create() */
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void refcount_create(refcount_t *rc);
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void refcount_destroy(refcount_t *rc);
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void refcount_destroy_many(refcount_t *rc, uint64_t number);
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int refcount_is_zero(refcount_t *rc);
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int64_t refcount_count(refcount_t *rc);
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int64_t refcount_add(refcount_t *rc, void *holder_tag);
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int64_t refcount_remove(refcount_t *rc, void *holder_tag);
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int64_t refcount_add_many(refcount_t *rc, uint64_t number, void *holder_tag);
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int64_t refcount_remove_many(refcount_t *rc, uint64_t number, void *holder_tag);
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void refcount_init(void);
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void refcount_fini(void);
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#else /* DEBUG */
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typedef struct refcount {
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uint64_t rc_count;
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} refcount_t;
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#define refcount_create(rc) ((rc)->rc_count = 0)
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#define refcount_destroy(rc) ((rc)->rc_count = 0)
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#define refcount_destroy_many(rc, number) ((rc)->rc_count = 0)
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#define refcount_is_zero(rc) ((rc)->rc_count == 0)
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#define refcount_count(rc) ((rc)->rc_count)
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#define refcount_add(rc, holder) atomic_add_64_nv(&(rc)->rc_count, 1)
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#define refcount_remove(rc, holder) atomic_add_64_nv(&(rc)->rc_count, -1)
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#define refcount_add_many(rc, number, holder) \
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atomic_add_64_nv(&(rc)->rc_count, number)
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#define refcount_remove_many(rc, number, holder) \
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atomic_add_64_nv(&(rc)->rc_count, -number)
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#define refcount_init()
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#define refcount_fini()
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#endif /* DEBUG */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_REFCOUNT_H */
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