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reentrant.h
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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 */