/*-

 * Copyright (c) 1997,98 The NetBSD Foundation, Inc.

 * All rights reserved.

 *

 * This code is derived from software contributed to The NetBSD Foundation

 * by J.T. Conklin.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 4. Neither the name of The NetBSD Foundation nor the names of its

 *    contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS

 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED

 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS

 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * $FreeBSD: src/lib/libc/include/reentrant.h,v 1.3 2004/02/25 21:03:45 green Exp $

 */

/*

 * Requirements:

 * 

 * 1. The thread safe mechanism should be lightweight so the library can

 *    be used by non-threaded applications without unreasonable overhead.

 * 

 * 2. There should be no dependency on a thread engine for non-threaded

 *    applications.

 * 

 * 3. There should be no dependency on any particular thread engine.

 * 

 * 4. The library should be able to be compiled without support for thread

 *    safety.

 * 

 * 

 * Rationale:

 * 

 * One approach for thread safety is to provide discrete versions of the

 * library: one thread safe, the other not.  The disadvantage of this is

 * that libc is rather large, and two copies of a library which are 99%+

 * identical is not an efficent use of resources.

 * 

 * Another approach is to provide a single thread safe library.  However,

 * it should not add significant run time or code size overhead to non-

 * threaded applications.

 * 

 * Since the NetBSD C library is used in other projects, it should be

 * easy to replace the mutual exclusion primitives with ones provided by

 * another system.  Similarly, it should also be easy to remove all

 * support for thread safety completely if the target environment does

 * not support threads.

 * 

 * 

 * Implementation Details:

 * 

 * The mutex primitives used by the library (mutex_t, mutex_lock, etc.)

 * are macros which expand to the cooresponding primitives provided by

 * the thread engine or to nothing.  The latter is used so that code is

 * not unreasonably cluttered with #ifdefs when all thread safe support

 * is removed.

 * 

 * The mutex macros can be directly mapped to the mutex primitives from

 * pthreads, however it should be reasonably easy to wrap another mutex

 * implementation so it presents a similar interface.

 * 

 * Stub implementations of the mutex functions are provided with *weak*

 * linkage.  These functions simply return success.  When linked with a

 * thread library (i.e. -lpthread), the functions will override the

 * stubs.

 */

#include <pthread.h>

#ifndef __SYMBIAN32__

#include <pthread_np.h>

#endif

#include "libc_private.h"

#define mutex_t			pthread_mutex_t

#define cond_t			pthread_cond_t

#define rwlock_t		pthread_rwlock_t

#define once_t			pthread_once_t

#define thread_key_t		pthread_key_t

#define MUTEX_INITIALIZER	PTHREAD_MUTEX_INITIALIZER

#define RWLOCK_INITIALIZER	PTHREAD_RWLOCK_INITIALIZER

#define ONCE_INITIALIZER	PTHREAD_ONCE_INIT

#define mutex_init(m, a)	_pthread_mutex_init(m, a)

#define mutex_lock(m)		if (__isthreaded) \

				_pthread_mutex_lock(m)

#define mutex_unlock(m)		if (__isthreaded) \

				_pthread_mutex_unlock(m)

#define mutex_trylock(m)	(__isthreaded ? 0 : _pthread_mutex_trylock(m))

#define cond_init(c, a, p)	_pthread_cond_init(c, a)

#define cond_signal(m)		if (__isthreaded) \

				_pthread_cond_signal(m)

#define cond_broadcast(m)	if (__isthreaded) \

				_pthread_cond_broadcast(m)

#define cond_wait(c, m)		if (__isthreaded) \

				_pthread_cond_wait(c, m)

#define rwlock_init(l, a)	_pthread_rwlock_init(l, a)

#define rwlock_rdlock(l)	if (__isthreaded) \

				_pthread_rwlock_rdlock(l)

#define rwlock_wrlock(l)	if (__isthreaded) \

				_pthread_rwlock_wrlock(l)

#define rwlock_unlock(l)	if (__isthreaded) \

				_pthread_rwlock_unlock(l)

#define thr_keycreate(k, d)	_pthread_key_create(k, d)

#define thr_setspecific(k, p)	_pthread_setspecific(k, p)

#define thr_getspecific(k)	_pthread_getspecific(k)

#define thr_sigsetmask(f, n, o)	_pthread_sigmask(f, n, o)

#define thr_once(o, i)		_pthread_once(o, i)

#define thr_self()		_pthread_self()

#define thr_exit(x)		_pthread_exit(x)

#define thr_main()		_pthread_main_np()