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 2006 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 "synonyms.h" 30 #include <mtlib.h> 31 #include <sys/types.h> 32 #include <synch.h> 33 #include <thread.h> 34 #include "libc.h" 35 36 /* 37 * fork1-safety. 38 * These three routines were used to make some libc interfaces fork1-safe. 39 * With the merge of libthread into libc, almost all libc internal-only 40 * locks are acquired via lmutex_lock() or lrw_rdlock()/lrw_wrlock(), 41 * which makes them automatically fork1-safe (as well as async-signal 42 * safe), so these functions are now used only for the locks that cannot 43 * be used with lmutex_lock or lrw_rdlock()/lrw_wrlock(). 44 */ 45 46 extern void atexit_locks(void); 47 extern void atexit_unlocks(void); 48 49 extern void stdio_locks(void); 50 extern void stdio_unlocks(void); 51 52 extern void malloc_locks(void); 53 extern void malloc_unlocks(void); 54 55 static void 56 libc_prepare_atfork(void) 57 { 58 atexit_locks(); 59 stdio_locks(); 60 malloc_locks(); 61 } 62 63 static void 64 libc_child_atfork(void) 65 { 66 malloc_unlocks(); 67 stdio_unlocks(); 68 atexit_unlocks(); 69 } 70 71 static void 72 libc_parent_atfork(void) 73 { 74 malloc_unlocks(); 75 stdio_unlocks(); 76 atexit_unlocks(); 77 } 78 79 /* called from libc_init() */ 80 void 81 atfork_init(void) 82 { 83 /* same as pthread_atfork() but private to libc */ 84 extern int _private_pthread_atfork(void (*)(void), 85 void (*)(void), void (*)(void)); 86 87 (void) _private_pthread_atfork(libc_prepare_atfork, 88 libc_parent_atfork, libc_child_atfork); 89 } 90