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-/*-
- * 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.
- *
- * 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.
- *
- * $FreeBSD$
- */
-
-/*
- * 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>
-#include <pthread_np.h>
-#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()
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