269 lines
9.4 KiB
C
269 lines
9.4 KiB
C
/* $NetBSD: reentrant.h,v 1.10 2004/12/14 00:23:19 nathanw Exp $ */
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/*-
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* Copyright (c) 1997, 1998, 2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by J.T. Conklin, by Nathan J. Williams, and by Jason R. Thorpe.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Requirements:
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*
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* 1. The thread safe mechanism should be lightweight so the library can
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* be used by non-threaded applications without unreasonable overhead.
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*
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* 2. There should be no dependency on a thread engine for non-threaded
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* applications.
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*
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* 3. There should be no dependency on any particular thread engine.
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*
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* 4. The library should be able to be compiled without support for thread
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* safety.
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*
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*
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* Rationale:
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*
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* One approach for thread safety is to provide discrete versions of the
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* library: one thread safe, the other not. The disadvantage of this is
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* that libc is rather large, and two copies of a library which are 99%+
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* identical is not an efficent use of resources.
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*
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* Another approach is to provide a single thread safe library. However,
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* it should not add significant run time or code size overhead to non-
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* threaded applications.
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*
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* Since the NetBSD C library is used in other projects, it should be
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* easy to replace the mutual exclusion primitives with ones provided by
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* another system. Similarly, it should also be easy to remove all
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* support for thread safety completely if the target environment does
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* not support threads.
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*
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*
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* Implementation Details:
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*
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* The thread primitives used by the library (mutex_t, mutex_lock, etc.)
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* are macros which expand to the cooresponding primitives provided by
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* the thread engine or to nothing. The latter is used so that code is
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* not unreasonably cluttered with #ifdefs when all thread safe support
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* is removed.
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*
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* The thread macros can be directly mapped to the mutex primitives from
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* pthreads, however it should be reasonably easy to wrap another mutex
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* implementation so it presents a similar interface.
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*
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* The thread functions operate by dispatching to symbols which are, by
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* default, weak-aliased to no-op functions in thread-stub/thread-stub.c
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* (some uses of thread operations are conditional on __isthreaded, but
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* not all of them are).
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*
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* When the thread library is linked in, it provides strong-alias versions
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* of those symbols which dispatch to its own real thread operations.
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*
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*/
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#ifdef _REENTRANT
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/*
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* Abtract thread interface for thread-safe libraries. These routines
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* will use stubs in libc if the application is not linked against the
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* pthread library, and the real function in the pthread library if it
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* is.
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*/
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#include <pthread.h>
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#include <signal.h>
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#define mutex_t pthread_mutex_t
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#define MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
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#define mutexattr_t pthread_mutexattr_t
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#define MUTEX_TYPE_NORMAL PTHREAD_MUTEX_NORMAL
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#define MUTEX_TYPE_ERRORCHECK PTHREAD_MUTEX_ERRORCHECK
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#define MUTEX_TYPE_RECURSIVE PTHREAD_MUTEX_RECURSIVE
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#define cond_t pthread_cond_t
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#define COND_INITIALIZER PTHREAD_COND_INITIALIZER
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#define condattr_t pthread_condattr_t
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#define rwlock_t pthread_rwlock_t
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#define RWLOCK_INITIALIZER PTHREAD_RWLOCK_INITIALIZER
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#define rwlockattr_t pthread_rwlockattr_t
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#define thread_key_t pthread_key_t
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#define thr_t pthread_t
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#define thrattr_t pthread_attr_t
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#define once_t pthread_once_t
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#define ONCE_INITIALIZER PTHREAD_ONCE_INIT
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#ifndef __LIBC_THREAD_STUBS
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__BEGIN_DECLS
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int __libc_mutex_init(mutex_t *, const mutexattr_t *);
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int __libc_mutex_lock(mutex_t *);
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int __libc_mutex_trylock(mutex_t *);
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int __libc_mutex_unlock(mutex_t *);
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int __libc_mutex_destroy(mutex_t *);
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int __libc_mutexattr_init(mutexattr_t *);
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int __libc_mutexattr_settype(mutexattr_t *, int);
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int __libc_mutexattr_destroy(mutexattr_t *);
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__END_DECLS
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#define mutex_init(m, a) __libc_mutex_init((m), (a))
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#define mutex_lock(m) __libc_mutex_lock((m))
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#define mutex_trylock(m) __libc_mutex_trylock((m))
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#define mutex_unlock(m) __libc_mutex_unlock((m))
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#define mutex_destroy(m) __libc_mutex_destroy((m))
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#define mutexattr_init(ma) __libc_mutexattr_init((ma))
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#define mutexattr_settype(ma, t) __libc_mutexattr_settype((ma), (t))
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#define mutexattr_destroy(ma) __libc_mutexattr_destroy((ma))
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__BEGIN_DECLS
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int __libc_cond_init(cond_t *, const condattr_t *);
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int __libc_cond_signal(cond_t *);
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int __libc_cond_broadcast(cond_t *);
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int __libc_cond_wait(cond_t *, mutex_t *);
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int __libc_cond_timedwait(cond_t *, mutex_t *, const struct timespec *);
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int __libc_cond_destroy(cond_t *);
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__END_DECLS
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#define cond_init(c, t, a) __libc_cond_init((c), (a))
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#define cond_signal(c) __libc_cond_signal((c))
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#define cond_broadcast(c) __libc_cond_broadcast((c))
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#define cond_wait(c, m) __libc_cond_wait((c), (m))
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#define cond_timedwait(c, m, t) __libc_cond_timedwait((c), (m), (t))
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#define cond_destroy(c) __libc_cond_destroy((c))
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__BEGIN_DECLS
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int __libc_rwlock_init(rwlock_t *, const rwlockattr_t *);
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int __libc_rwlock_rdlock(rwlock_t *);
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int __libc_rwlock_wrlock(rwlock_t *);
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int __libc_rwlock_tryrdlock(rwlock_t *);
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int __libc_rwlock_trywrlock(rwlock_t *);
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int __libc_rwlock_unlock(rwlock_t *);
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int __libc_rwlock_destroy(rwlock_t *);
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__END_DECLS
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#define rwlock_init(l, a) __libc_rwlock_init((l), (a))
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#define rwlock_rdlock(l) __libc_rwlock_rdlock((l))
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#define rwlock_wrlock(l) __libc_rwlock_wrlock((l))
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#define rwlock_tryrdlock(l) __libc_rwlock_tryrdlock((l))
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#define rwlock_trywrlock(l) __libc_rwlock_trywrlock((l))
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#define rwlock_unlock(l) __libc_rwlock_unlock((l))
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#define rwlock_destroy(l) __libc_rwlock_destroy((l))
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__BEGIN_DECLS
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int __libc_thr_keycreate(thread_key_t *, void (*)(void *));
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int __libc_thr_setspecific(thread_key_t, const void *);
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void *__libc_thr_getspecific(thread_key_t);
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int __libc_thr_keydelete(thread_key_t);
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__END_DECLS
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#define thr_keycreate(k, d) __libc_thr_keycreate((k), (d))
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#define thr_setspecific(k, p) __libc_thr_setspecific((k), (p))
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#define thr_getspecific(k) __libc_thr_getspecific((k))
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#define thr_keydelete(k) __libc_thr_keydelete((k))
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__BEGIN_DECLS
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int __libc_thr_once(once_t *, void (*)(void));
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int __libc_thr_sigsetmask(int, const sigset_t *, sigset_t *);
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thr_t __libc_thr_self(void);
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int __libc_thr_yield(void);
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void __libc_thr_create(thr_t *, const thrattr_t *,
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void *(*)(void *), void *);
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void __libc_thr_exit(void *) __attribute__((__noreturn__));
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int *__libc_thr_errno(void);
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int __libc_thr_setcancelstate(int, int *);
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extern int __isthreaded;
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__END_DECLS
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#define thr_once(o, f) __libc_thr_once((o), (f))
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#define thr_sigsetmask(f, n, o) __libc_thr_sigsetmask((f), (n), (o))
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#define thr_self() __libc_thr_self()
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#define thr_yield() __libc_thr_yield()
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#define thr_create(tp, ta, f, a) __libc_thr_create((tp), (ta), (f), (a))
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#define thr_exit(v) __libc_thr_exit((v))
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#define thr_errno() __libc_thr_errno()
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#define thr_enabled() (__isthreaded)
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#define thr_setcancelstate(n, o) __libc_thr_setcancelstate((n),(o))
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#endif /* __LIBC_THREAD_STUBS */
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#define FLOCKFILE(fp) __flockfile_internal(fp, 1)
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#define FUNLOCKFILE(fp) __funlockfile_internal(fp, 1)
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#else /* _REENTRANT */
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#define mutex_init(m, a)
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#define mutex_lock(m)
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#define mutex_trylock(m)
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#define mutex_unlock(m)
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#define mutex_destroy(m)
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#define cond_init(c, t, a)
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#define cond_signal(c)
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#define cond_broadcast(c)
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#define cond_wait(c, m)
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#define cond_timedwait(c, m, t)
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#define cond_destroy(c)
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#define rwlock_init(l, a)
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#define rwlock_rdlock(l)
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#define rwlock_wrlock(l)
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#define rwlock_tryrdlock(l)
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#define rwlock_trywrlock(l)
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#define rwlock_unlock(l)
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#define rwlock_destroy(l)
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#define thr_keycreate(k, d)
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#define thr_setspecific(k, p)
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#define thr_getspecific(k)
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#define thr_keydelete(k)
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#define thr_once(o, f)
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#define thr_sigsetmask(f, n, o)
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#define thr_self()
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#define thr_errno()
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#define FLOCKFILE(fp)
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#define FUNLOCKFILE(fp)
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#endif /* _REENTRANT */
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