/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000-2002 The Apache Software Foundation.  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. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
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 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

#include "apr.h"
#include "apr_private.h"
#include "apr_general.h"
#include "apr_strings.h"
#include "thread_mutex.h"
#include "apr_portable.h"

static apr_status_t thread_mutex_cleanup(void *data)
{
    apr_thread_mutex_t *mutex = (apr_thread_mutex_t *)data;

    NXMutexFree(mutex->mutex);        
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_thread_mutex_create(apr_thread_mutex_t **mutex,
                                                  unsigned int flags,
                                                  apr_pool_t *pool)
{
    apr_thread_mutex_t *new_mutex = NULL;

    /* XXX: Implement _UNNESTED flavor and favor _DEFAULT for performance
     */
    if (flags & APR_THREAD_MUTEX_UNNESTED) {
        return APR_ENOTIMPL;
    }
    new_mutex = (apr_thread_mutex_t *)apr_pcalloc(pool, sizeof(apr_thread_mutex_t));
	
	if(new_mutex ==NULL) {
        return APR_ENOMEM;
    }     
    new_mutex->pool = pool;

    new_mutex->mutex = NXMutexAlloc(NX_MUTEX_RECURSIVE, NULL, NULL);
    
    if(new_mutex->mutex == NULL)
        return APR_ENOMEM;

    apr_pool_cleanup_register(new_mutex->pool, new_mutex, 
                                (void*)thread_mutex_cleanup,
                                apr_pool_cleanup_null);
   *mutex = new_mutex;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_thread_mutex_lock(apr_thread_mutex_t *mutex)
{
    NXLock(mutex->mutex);
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_thread_mutex_trylock(apr_thread_mutex_t *mutex)
{
    if (!NXTryLock(mutex->mutex))
        return APR_EBUSY;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_thread_mutex_unlock(apr_thread_mutex_t *mutex)
{
    NXUnlock(mutex->mutex);
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_thread_mutex_destroy(apr_thread_mutex_t *mutex)
{
    apr_status_t stat;
    if ((stat = thread_mutex_cleanup(mutex)) == APR_SUCCESS) {
        apr_pool_cleanup_kill(mutex->pool, mutex, thread_mutex_cleanup);
        return APR_SUCCESS;
    }
    return stat;
}

APR_POOL_IMPLEMENT_ACCESSOR(thread_mutex)

