refcount.h revision 3b2aab18808792cbd248a12f1edf139b89833c13
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER START
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The contents of this file are subject to the terms of the
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * Common Development and Distribution License (the "License").
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * You may not use this file except in compliance with the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
fa9e4066f08beec538e775443c5be79dd423fcabahrens * See the License for the specific language governing permissions
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fa9e4066f08beec538e775443c5be79dd423fcabahrens * When distributing Covered Code, include this CDDL HEADER in each
fa9e4066f08beec538e775443c5be79dd423fcabahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If applicable, add the following below this CDDL HEADER, with the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * fields enclosed by brackets "[]" replaced with your own identifying
fa9e4066f08beec538e775443c5be79dd423fcabahrens * information: Portions Copyright [yyyy] [name of copyright owner]
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER END
3f9d6ad73e45c6823b409f93b0c8d4f62861d2d5Lin Ling * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
28e4da25922bdfc5cba7ab29f47de911bbd78009Matthew Ahrens * Copyright (c) 2012 by Delphix. All rights reserved.
fa9e4066f08beec538e775443c5be79dd423fcabahrensextern "C" {
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If the reference is held only by the calling function and not any
fa9e4066f08beec538e775443c5be79dd423fcabahrens * particular object, use FTAG (which is a string) for the holder_tag.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Otherwise, use the object that holds the reference.
fa9e4066f08beec538e775443c5be79dd423fcabahrenstypedef struct reference {
fa9e4066f08beec538e775443c5be79dd423fcabahrenstypedef struct refcount {
3b2aab18808792cbd248a12f1edf139b89833c13Matthew Ahrens/* Note: refcount_t must be initialized with refcount_create[_untracked]() */
3b2aab18808792cbd248a12f1edf139b89833c13Matthew Ahrensvoid refcount_create_untracked(refcount_t *rc);
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid refcount_destroy_many(refcount_t *rc, uint64_t number);
fa9e4066f08beec538e775443c5be79dd423fcabahrensint64_t refcount_add(refcount_t *rc, void *holder_tag);
fa9e4066f08beec538e775443c5be79dd423fcabahrensint64_t refcount_remove(refcount_t *rc, void *holder_tag);
fa9e4066f08beec538e775443c5be79dd423fcabahrensint64_t refcount_add_many(refcount_t *rc, uint64_t number, void *holder_tag);
fa9e4066f08beec538e775443c5be79dd423fcabahrensint64_t refcount_remove_many(refcount_t *rc, uint64_t number, void *holder_tag);
744947dc83c634d985ed3ad79ac9c5e28d1865fdTom Ericksonvoid refcount_transfer(refcount_t *dst, refcount_t *src);
744947dc83c634d985ed3ad79ac9c5e28d1865fdTom Erickson#else /* ZFS_DEBUG */
fa9e4066f08beec538e775443c5be79dd423fcabahrenstypedef struct refcount {
3b2aab18808792cbd248a12f1edf139b89833c13Matthew Ahrens#define refcount_create_untracked(rc) ((rc)->rc_count = 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens#define refcount_destroy_many(rc, number) ((rc)->rc_count = 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens#define refcount_add(rc, holder) atomic_add_64_nv(&(rc)->rc_count, 1)
fa9e4066f08beec538e775443c5be79dd423fcabahrens#define refcount_remove(rc, holder) atomic_add_64_nv(&(rc)->rc_count, -1)
744947dc83c634d985ed3ad79ac9c5e28d1865fdTom Erickson#endif /* ZFS_DEBUG */
fa9e4066f08beec538e775443c5be79dd423fcabahrens#endif /* _SYS_REFCOUNT_H */