/*
 * Copyright (c) 2003 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * 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. 
 *
 * 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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. 
 */

/* $Id$ */

/*
 * Provide wrapper macros for thread synchronization primitives so we
 * can use native thread functions for those operating system that
 * supports it.
 *
 * This is so libkrb5.so (or more importantly, libgssapi.so) can have
 * thread support while the program that that dlopen(3)s the library
 * don't need to be linked to libpthread.
 */

#ifndef HEIM_THREADS_H
#define HEIM_THREADS_H 1

/* assume headers already included */

#if defined(__NetBSD__) && __NetBSD_Version__ >= 106120000

/* 
 * NetBSD have a thread lib that we can use that part of libc that
 * works regardless if application are linked to pthreads or not.
 */
#include <threadlib.h>

#define HEIMDAL_MUTEX mutex_t
#define HEIMDAL_MUTEX_INITIALIZER MUTEX_INITIALIZER
#define HEIMDAL_MUTEX_init(m) mutex_init(m, NULL)
#define HEIMDAL_MUTEX_lock(m) mutex_lock(m)
#define HEIMDAL_MUTEX_unlock(m) mutex_unlock(m)
#define HEIMDAL_MUTEX_destroy(m) mutex_destroy(m)

#elif defined(ENABLE_PTHREAD_SUPPORT)

#define HEIMDAL_MUTEX pthread_mutex_t
#define HEIMDAL_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
#define HEIMDAL_MUTEX_init(m) pthread_mutex_init(m, NULL)
#define HEIMDAL_MUTEX_lock(m) pthread_mutex_lock(m)
#define HEIMDAL_MUTEX_unlock(m) pthread_mutex_unlock(m)
#define HEIMDAL_MUTEX_destroy(m) pthread_mutex_destroy(m)

#elif defined(HEIMDAL_DEBUG_THREADS)

/* no threads support, just do consistency checks */
#include <stdlib.h>

#define HEIMDAL_MUTEX int
#define HEIMDAL_MUTEX_INITIALIZER 0
#define HEIMDAL_MUTEX_init(m)  do { (*(m)) = 0; } while(0)
#define HEIMDAL_MUTEX_lock(m)  do { if ((*(m))++ != 0) abort(); } while(0)
#define HEIMDAL_MUTEX_unlock(m) do { if ((*(m))-- != 1) abort(); } while(0)
#define HEIMDAL_MUTEX_destroy(m) do {if ((*(m)) != 0) abort(); } while(0)

#else /* no thread support, no debug case */

#define HEIMDAL_MUTEX int
#define HEIMDAL_MUTEX_INITIALIZER 0
#define HEIMDAL_MUTEX_init(m)  do { } while(0)
#define HEIMDAL_MUTEX_lock(m)  do { } while(0)
#define HEIMDAL_MUTEX_unlock(m) do { } while(0)
#define HEIMDAL_MUTEX_destroy(m) do { } while(0)

#endif /* no thread support */

#endif /* HEIM_THREADS_H */