/* Copyright 2000-2004 The Apache Software Foundation
		 *
		 * Licensed under the Apache License, Version 2.0 (the "License");
		 * you may not use this file except in compliance with the License.
		 * You may obtain a copy of the License at
		 *
		 *     http://www.apache.org/licenses/LICENSE-2.0
		 *
		 * Unless required by applicable law or agreed to in writing, software
		 * distributed under the License is distributed on an "AS IS" BASIS,
		 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		 * See the License for the specific language governing permissions and
		 * limitations under the License.
		 */
		
		#include "apr_arch_thread_rwlock.h"
		#include "apr_private.h"
		
		#if APR_HAS_THREADS
		
		#ifdef HAVE_PTHREAD_RWLOCKS
		
		/* The rwlock must be initialized but not locked by any thread when
		 * cleanup is called. */
		static apr_status_t thread_rwlock_cleanup(void *data)
           3    {
           3        apr_thread_rwlock_t *rwlock = (apr_thread_rwlock_t *)data;
           3        apr_status_t stat;
		
           3        stat = pthread_rwlock_destroy(&rwlock->rwlock);
		#ifdef PTHREAD_SETS_ERRNO
		    if (stat) {
		        stat = errno;
		    }
		#endif
           3        return stat;
		} 
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_create(apr_thread_rwlock_t **rwlock,
		                                                   apr_pool_t *pool)
           1    {
           1        apr_thread_rwlock_t *new_rwlock;
           1        apr_status_t stat;
		
           1        new_rwlock = apr_palloc(pool, sizeof(apr_thread_rwlock_t));
           1        new_rwlock->pool = pool;
		
           1        if ((stat = pthread_rwlock_init(&new_rwlock->rwlock, NULL))) {
		#ifdef PTHREAD_SETS_ERRNO
		        stat = errno;
		#endif
      ######            return stat;
		    }
		
           1        apr_pool_cleanup_register(new_rwlock->pool,
		                              (void *)new_rwlock, thread_rwlock_cleanup,
		                              apr_pool_cleanup_null);
		
           1        *rwlock = new_rwlock;
           1        return APR_SUCCESS;
		}
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_rdlock(apr_thread_rwlock_t *rwlock)
       40004    {
       40004        apr_status_t stat;
		
       40004        stat = pthread_rwlock_rdlock(&rwlock->rwlock);
		#ifdef PTHREAD_SETS_ERRNO
		    if (stat) {
		        stat = errno;
		    }
		#endif
       40004        return stat;
		}
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_tryrdlock(apr_thread_rwlock_t *rwlock)
      ######    {
      ######        apr_status_t stat;
		
      ######        stat = pthread_rwlock_tryrdlock(&rwlock->rwlock);
		#ifdef PTHREAD_SETS_ERRNO
		    if (stat) {
		        stat = errno;
		    }
		#endif
		    /* Normalize the return code. */
      ######        if (stat == EBUSY)
      ######            stat = APR_EBUSY;
      ######        return stat;
		}
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_wrlock(apr_thread_rwlock_t *rwlock)
       40000    {
       40000        apr_status_t stat;
		
       40000        stat = pthread_rwlock_wrlock(&rwlock->rwlock);
		#ifdef PTHREAD_SETS_ERRNO
		    if (stat) {
		        stat = errno;
		    }
		#endif
       40000        return stat;
		}
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_trywrlock(apr_thread_rwlock_t *rwlock)
      ######    {
      ######        apr_status_t stat;
		
      ######        stat = pthread_rwlock_trywrlock(&rwlock->rwlock);
		#ifdef PTHREAD_SETS_ERRNO
		    if (stat) {
		        stat = errno;
		    }
		#endif
		    /* Normalize the return code. */
      ######        if (stat == EBUSY)
      ######            stat = APR_EBUSY;
      ######        return stat;
		}
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_unlock(apr_thread_rwlock_t *rwlock)
       80004    {
       80004        apr_status_t stat;
		
       80004        stat = pthread_rwlock_unlock(&rwlock->rwlock);
		#ifdef PTHREAD_SETS_ERRNO
		    if (stat) {
		        stat = errno;
		    }
		#endif
       80004        return stat;
		}
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_destroy(apr_thread_rwlock_t *rwlock)
      ######    {
      ######        return apr_pool_cleanup_run(rwlock->pool, rwlock, thread_rwlock_cleanup);
		}
		
		#else  /* HAVE_PTHREAD_RWLOCKS */
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_create(apr_thread_rwlock_t **rwlock,
		                                                   apr_pool_t *pool)
		{
		    return APR_ENOTIMPL;
		}
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_rdlock(apr_thread_rwlock_t *rwlock)
		{
		    return APR_ENOTIMPL;
		}
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_tryrdlock(apr_thread_rwlock_t *rwlock)
		{
		    return APR_ENOTIMPL;
		}
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_wrlock(apr_thread_rwlock_t *rwlock)
		{
		    return APR_ENOTIMPL;
		}
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_trywrlock(apr_thread_rwlock_t *rwlock)
		{
		    return APR_ENOTIMPL;
		}
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_unlock(apr_thread_rwlock_t *rwlock)
		{
		    return APR_ENOTIMPL;
		}
		
		APR_DECLARE(apr_status_t) apr_thread_rwlock_destroy(apr_thread_rwlock_t *rwlock)
		{
		    return APR_ENOTIMPL;
		}
		
		#endif /* HAVE_PTHREAD_RWLOCKS */
      ######    APR_POOL_IMPLEMENT_ACCESSOR(thread_rwlock)
		
		#endif /* APR_HAS_THREADS */