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 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/systm.h> 30 #include <sys/param.h> 31 #include <sys/atomic.h> 32 #include <sys/kmem.h> 33 #include <sys/refstr.h> 34 #include <sys/refstr_impl.h> 35 36 refstr_t * 37 refstr_alloc(const char *str) 38 { 39 refstr_t *rsp; 40 size_t size = sizeof (rsp->rs_size) + sizeof (rsp->rs_refcnt) + 41 strlen(str) + 1; 42 43 ASSERT(size <= UINT32_MAX); 44 rsp = kmem_alloc(size, KM_SLEEP); 45 rsp->rs_size = (uint32_t)size; 46 rsp->rs_refcnt = 1; 47 (void) strcpy(rsp->rs_string, str); 48 return (rsp); 49 } 50 51 const char * 52 refstr_value(refstr_t *rsp) 53 { 54 return (rsp != NULL ? (const char *)rsp->rs_string : NULL); 55 } 56 57 void 58 refstr_hold(refstr_t *rsp) 59 { 60 atomic_add_32(&rsp->rs_refcnt, 1); 61 } 62 63 void 64 refstr_rele(refstr_t *rsp) 65 { 66 if (atomic_add_32_nv(&rsp->rs_refcnt, -1) == 0) 67 kmem_free(rsp, (size_t)rsp->rs_size); 68 } 69