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 /* 24 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 #pragma ident "%Z%%M% %I% %E% SMI" 29 30 #include "mt.h" 31 #include <stdlib.h> 32 33 void * 34 thr_get_storage(pthread_key_t *keyp, size_t size, void (*destructor)(void *)) 35 { 36 extern mutex_t tsd_lock; 37 pthread_key_t key; 38 void *addr; 39 40 if ((key = *keyp) == 0) { 41 (void) mutex_lock(&tsd_lock); 42 if ((key = *keyp) == 0) { 43 if (pthread_key_create(keyp, destructor) != 0) { 44 (void) mutex_unlock(&tsd_lock); 45 return (NULL); 46 } 47 key = *keyp; 48 } 49 (void) mutex_unlock(&tsd_lock); 50 } 51 52 addr = pthread_getspecific(key); 53 if (addr == NULL && size != 0) { 54 addr = calloc(1, size); 55 if (addr != NULL && pthread_setspecific(key, addr) != 0) { 56 free(addr); 57 return (NULL); 58 } 59 } 60 61 return (addr); 62 } 63 64 /* 65 * sig_mutex_lock() and sig_mutex_unlock() are the same 66 * as mutex_lock() and mutex_unlock() except that all 67 * signals are deferred while the lock is held. Likewise 68 * for sig_rw_rdlock(), sig_rw_wrlock() and sig_rw_unlock(). 69 * 70 * _sigoff() and _sigon() are consolidation-private 71 * interfaces in libc that defer and enable signals. 72 * Calls to these can nest but must be balanced, so 73 * nested calls to these functions work properly. 74 */ 75 76 void 77 sig_mutex_lock(mutex_t *mp) 78 { 79 _sigoff(); 80 (void) mutex_lock(mp); 81 } 82 83 void 84 sig_mutex_unlock(mutex_t *mp) 85 { 86 (void) mutex_unlock(mp); 87 _sigon(); 88 } 89 90 void 91 sig_rw_rdlock(rwlock_t *rwlp) 92 { 93 _sigoff(); 94 (void) rw_rdlock(rwlp); 95 } 96 97 void 98 sig_rw_wrlock(rwlock_t *rwlp) 99 { 100 _sigoff(); 101 (void) rw_wrlock(rwlp); 102 } 103 104 void 105 sig_rw_unlock(rwlock_t *rwlp) 106 { 107 (void) rw_unlock(rwlp); 108 _sigon(); 109 } 110