usr/src/lib/libnsl/common/common.c

   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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2007 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 "mt.h"
  30 #include <stdlib.h>
  31
  32 void *
  33 thr_get_storage(pthread_key_t *keyp, size_t size, void (*destructor)(void *))
  34 {
  35         void *addr;
  36
  37         if (pthread_key_create_once_np(keyp, destructor) != 0)
  38                 return (NULL);
  39         addr = pthread_getspecific(*keyp);
  40         if (addr == NULL && size != 0) {
  41                 addr = calloc(1, size);
  42                 if (addr != NULL && pthread_setspecific(*keyp, addr) != 0) {
  43                         free(addr);
  44                         return (NULL);
  45                 }
  46         }
  47
  48         return (addr);
  49 }
  50
  51 /*
  52  * sig_mutex_lock() and sig_mutex_unlock() are the same
  53  * as mutex_lock() and mutex_unlock() except that all
  54  * signals are deferred while the lock is held.  Likewise
  55  * for sig_rw_rdlock(), sig_rw_wrlock() and sig_rw_unlock().
  56  *
  57  * _sigoff() and _sigon() are consolidation-private
  58  * interfaces in libc that defer and enable signals.
  59  * Calls to these can nest but must be balanced, so
  60  * nested calls to these functions work properly.
  61  */
  62
  63 void
  64 sig_mutex_lock(mutex_t *mp)
  65 {
  66         _sigoff();
  67         (void) mutex_lock(mp);
  68 }
  69
  70 void
  71 sig_mutex_unlock(mutex_t *mp)
  72 {
  73         (void) mutex_unlock(mp);
  74         _sigon();
  75 }
  76
  77 void
  78 sig_rw_rdlock(rwlock_t *rwlp)
  79 {
  80         _sigoff();
  81         (void) rw_rdlock(rwlp);
  82 }
  83
  84 void
  85 sig_rw_wrlock(rwlock_t *rwlp)
  86 {
  87         _sigoff();
  88         (void) rw_wrlock(rwlp);
  89 }
  90
  91 void
  92 sig_rw_unlock(rwlock_t *rwlp)
  93 {
  94         (void) rw_unlock(rwlp);
  95         _sigon();
  96 }