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 1993-2003 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _LIBNSL_INCLUDE_MT_H 28 #define _LIBNSL_INCLUDE_MT_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * Threading and mutual exclusion declarations of primitives used for 34 * MT operation of libnsl code. 35 * 36 * Note: These primitives are designed to achieve the effect of avoiding a 37 * deadlock possibility by an interface operation being called from 38 * a signal handler while holding a lock. 39 * Note: the sig_*() functions use the _sigoff() and _sigon() consolidation 40 * private interfaces provided by libc to defer all asynchronously 41 * generated signals for the duration of holding the lock. Unlike 42 * blocking all signals with sigprocmask() or thr_sigsetmask(), 43 * _sigoff() allows signals with default dispositions to exercise 44 * their default actions (killing the process, stopping the process). 45 */ 46 47 #include "mtlib.h" 48 #include <thread.h> 49 #include <pthread.h> 50 #include <signal.h> 51 #include <synch.h> 52 53 #ifdef __cplusplus 54 extern "C" { 55 #endif 56 57 extern sigset_t fillset; /* for actually blocking all signals */ 58 59 extern void sig_mutex_lock(mutex_t *); 60 extern void sig_mutex_unlock(mutex_t *); 61 extern void sig_rw_rdlock(rwlock_t *); 62 extern void sig_rw_wrlock(rwlock_t *); 63 extern void sig_rw_unlock(rwlock_t *); 64 65 extern void _sigoff(void); 66 extern void _sigon(void); 67 68 extern int _fcntl(int, int, ...); 69 extern int _ioctl(int, int, ...); 70 extern int _sigfillset(sigset_t *); 71 72 extern void *thr_get_storage(pthread_key_t *, size_t, void(*)(void *)); 73 74 #ifdef __cplusplus 75 } 76 #endif 77 78 #endif /* _LIBNSL_INCLUDE_MT_H */ 79