refcount.h revision fa9e4066f08beec538e775443c5be79dd423fcab
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER START
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fa9e4066f08beec538e775443c5be79dd423fcabahrens * Common Development and Distribution License, Version 1.0 only
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fa9e4066f08beec538e775443c5be79dd423fcabahrens * 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 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Use is subject to license terms.
fa9e4066f08beec538e775443c5be79dd423fcabahrens#pragma ident "%Z%%M% %I% %E% SMI"
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 {
fa9e4066f08beec538e775443c5be79dd423fcabahrens/* Note: refcount_t should be initialized to zero before use. */
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);
fa9e4066f08beec538e775443c5be79dd423fcabahrens#else /* DEBUG */
fa9e4066f08beec538e775443c5be79dd423fcabahrenstypedef struct refcount {
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)
fa9e4066f08beec538e775443c5be79dd423fcabahrens#endif /* DEBUG */
fa9e4066f08beec538e775443c5be79dd423fcabahrens#endif /* _SYS_REFCOUNT_H */