1 /*- 2 * Copyright (c) 1997,98 The NetBSD Foundation, Inc. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to The NetBSD Foundation 6 * by J.T. Conklin. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the NetBSD 19 * Foundation, Inc. and its contributors. 20 * 4. Neither the name of The NetBSD Foundation nor the names of its 21 * contributors may be used to endorse or promote products derived 22 * from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 26 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 27 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 28 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 * 36 * $FreeBSD: src/lib/libc/include/reentrant.h,v 1.2 2002/11/01 09:37:17 dfr Exp $ 37 */ 38 39 /* 40 * Requirements: 41 * 42 * 1. The thread safe mechanism should be lightweight so the library can 43 * be used by non-threaded applications without unreasonable overhead. 44 * 45 * 2. There should be no dependency on a thread engine for non-threaded 46 * applications. 47 * 48 * 3. There should be no dependency on any particular thread engine. 49 * 50 * 4. The library should be able to be compiled without support for thread 51 * safety. 52 * 53 * 54 * Rationale: 55 * 56 * One approach for thread safety is to provide discrete versions of the 57 * library: one thread safe, the other not. The disadvantage of this is 58 * that libc is rather large, and two copies of a library which are 99%+ 59 * identical is not an efficent use of resources. 60 * 61 * Another approach is to provide a single thread safe library. However, 62 * it should not add significant run time or code size overhead to non- 63 * threaded applications. 64 * 65 * Since the NetBSD C library is used in other projects, it should be 66 * easy to replace the mutual exclusion primitives with ones provided by 67 * another system. Similarly, it should also be easy to remove all 68 * support for thread safety completely if the target environment does 69 * not support threads. 70 * 71 * 72 * Implementation Details: 73 * 74 * The mutex primitives used by the library (mutex_t, mutex_lock, etc.) 75 * are macros which expand to the cooresponding primitives provided by 76 * the thread engine or to nothing. The latter is used so that code is 77 * not unreasonably cluttered with #ifdefs when all thread safe support 78 * is removed. 79 * 80 * The mutex macros can be directly mapped to the mutex primitives from 81 * pthreads, however it should be reasonably easy to wrap another mutex 82 * implementation so it presents a similar interface. 83 * 84 * Stub implementations of the mutex functions are provided with *weak* 85 * linkage. These functions simply return success. When linked with a 86 * thread library (i.e. -lpthread), the functions will override the 87 * stubs. 88 */ 89 90 /* NFSv4.1 client for Windows 91 * Copyright � 2012 The Regents of the University of Michigan 92 * 93 * Olga Kornievskaia <aglo@umich.edu> 94 * Casey Bodley <cbodley@umich.edu> 95 * 96 * This library is free software; you can redistribute it and/or modify it 97 * under the terms of the GNU Lesser General Public License as published by 98 * the Free Software Foundation; either version 2.1 of the License, or (at 99 * your option) any later version. 100 * 101 * This library is distributed in the hope that it will be useful, but 102 * without any warranty; without even the implied warranty of merchantability 103 * or fitness for a particular purpose. See the GNU Lesser General Public 104 * License for more details. 105 * 106 * You should have received a copy of the GNU Lesser General Public License 107 * along with this library; if not, write to the Free Software Foundation, 108 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 109 */ 110 111 #ifndef _REENTRANT_H 112 #define _REENTRANT_H 113 //#include <pthread.h> 114 #include <libc_private.h> 115 116 #include <stdlib.h> 117 118 119 #define mutex_t CRITICAL_SECTION 120 #define cond_t CONDITION_VARIABLE 121 #define rwlock_t SRWLOCK 122 123 124 #define thread_key_t DWORD 125 #define MUTEX_INITIALIZER -1 /*THIS_NEEDS_HELP*/ 126 #define RWLOCK_INITIALIZER -1 /*THIS_NEEDS_HELP*/ 127 #define mutex_init(m, a) InitializeCriticalSection(m) 128 #define mutex_lock(m) EnterCriticalSection(m) 129 #define mutex_unlock(m) LeaveCriticalSection(m) 130 #define mutex_trylock(m) TryEnterCriticalSection(m) 131 132 #define cond_init(c, a, p) InitializeConditionVariable(c) 133 #define cond_signal(m) WakeConditionVariable(m) 134 #define cond_broadcast(m) WakeAllConditionVariable(m) 135 #define cond_wait(c, m) SleepConditionVariableCS(c, m, INFINITE) 136 #define cond_wait_timed(c, m, t) SleepConditionVariableCS(c, m, t) 137 138 #define rwlock_init(l, a) InitializeSRWLock(l) 139 #define rwlock_rdlock(l) AcquireSRWLockShared(l) 140 #define rwlock_wrlock(l) AcquireSRWLockExclusive(l) 141 /* XXX Code will have to be changed to release the right kind!!! XXX */ 142 #define rwlock_unlock(l) ReleaseSRWLockExclusive(l) 143 144 #define thr_keycreate(k, d) ((*k) = TlsAlloc()) 145 #define thr_keydelete(k) TlsFree(k) 146 #define thr_setspecific(k, p) TlsSetValue(k, p) 147 #define thr_getspecific(k) TlsGetValue(k) 148 #define thr_sigsetmask(f, n, o) dunno_sigmask(f, n, o) 149 150 #define thr_self() GetCurrentThreadId() 151 #define thr_exit(x) ExitThread(x) 152 153 /* 154 #define mutex_t pthread_mutex_t 155 #define cond_t pthread_cond_t 156 #define rwlock_t pthread_rwlock_t 157 158 #define thread_key_t pthread_key_t 159 #define MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER 160 #define RWLOCK_INITIALIZER PTHREAD_RWLOCK_INITIALIZER 161 #define mutex_init(m, a) pthread_mutex_init(m, a) 162 #define mutex_lock(m) pthread_mutex_lock(m) 163 #define mutex_unlock(m) pthread_mutex_unlock(m) 164 #define mutex_trylock(m) pthread_mutex_trylock(m) 165 166 #define cond_init(c, a, p) pthread_cond_init(c, a) 167 #define cond_signal(m) pthread_cond_signal(m) 168 #define cond_broadcast(m) pthread_cond_broadcast(m) 169 #define cond_wait(c, m) pthread_cond_wait(c, m) 170 171 #define rwlock_init(l, a) pthread_rwlock_init(l, a) 172 #define rwlock_rdlock(l) pthread_rwlock_rdlock(l) 173 #define rwlock_wrlock(l) pthread_rwlock_wrlock(l) 174 #define rwlock_unlock(l) pthread_rwlock_unlock(l) 175 176 #define thr_keycreate(k, d) pthread_key_create(k, d) 177 #define thr_keydelete(k) pthread_key_delete(k) 178 #define thr_setspecific(k, p) pthread_setspecific(k, p) 179 #define thr_getspecific(k) pthread_getspecific(k) 180 #define thr_sigsetmask(f, n, o) pthread_sigmask(f, n, o) 181 182 #define thr_self() pthread_self() 183 #define thr_exit(x) pthread_exit(x) 184 */ 185 #endif /* reentrant.h */ 186