1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include <sys/systm.h> 28 #include <sys/param.h> 29 #include <sys/atomic.h> 30 #include <sys/kmem.h> 31 #include <sys/refstr.h> 32 #include <sys/refstr_impl.h> 33 34 refstr_t * 35 refstr_alloc(const char *str) 36 { 37 refstr_t *rsp; 38 size_t size = sizeof (rsp->rs_size) + sizeof (rsp->rs_refcnt) + 39 strlen(str) + 1; 40 41 ASSERT(size <= UINT32_MAX); 42 rsp = kmem_alloc(size, KM_SLEEP); 43 rsp->rs_size = (uint32_t)size; 44 rsp->rs_refcnt = 1; 45 (void) strcpy(rsp->rs_string, str); 46 return (rsp); 47 } 48 49 const char * 50 refstr_value(refstr_t *rsp) 51 { 52 return (rsp != NULL ? (const char *)rsp->rs_string : NULL); 53 } 54 55 void 56 refstr_hold(refstr_t *rsp) 57 { 58 atomic_inc_32(&rsp->rs_refcnt); 59 } 60 61 void 62 refstr_rele(refstr_t *rsp) 63 { 64 if (atomic_dec_32_nv(&rsp->rs_refcnt) == 0) 65 kmem_free(rsp, (size_t)rsp->rs_size); 66 } 67