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/*
* root_pools.c : Implement svn_root_pools__* API
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 "svn_pools.h"
#include "private/svn_subr_private.h"
#include "private/svn_mutex.h"
struct svn_root_pools__t
{
/* unused pools.
* Use MUTEX to serialize access to this collection.
*/
apr_array_header_t *unused_pools;
/* Mutex to serialize access to UNUSED_POOLS */
svn_mutex__t *mutex;
};
svn_error_t *
svn_root_pools__create(svn_root_pools__t **pools)
{
/* the collection of root pools must be managed independently from
any other pool */
apr_pool_t *pool
= apr_allocator_owner_get(svn_pool_create_allocator(FALSE));
/* construct result object */
svn_root_pools__t *result = apr_pcalloc(pool, sizeof(*result));
SVN_ERR(svn_mutex__init(&result->mutex, TRUE, pool));
result->unused_pools = apr_array_make(pool, 16, sizeof(apr_pool_t *));
/* done */
*pools = result;
return SVN_NO_ERROR;
}
/* Return a currently unused connection pool in *POOL. If no such pool
* exists, create a new root pool and return that in *POOL.
*/
static svn_error_t *
acquire_pool_internal(apr_pool_t **pool,
svn_root_pools__t *pools)
{
SVN_ERR(svn_mutex__lock(pools->mutex));
*pool = pools->unused_pools->nelts
? *(apr_pool_t **)apr_array_pop(pools->unused_pools)
: apr_allocator_owner_get(svn_pool_create_allocator(FALSE));
SVN_ERR(svn_mutex__unlock(pools->mutex, SVN_NO_ERROR));
return SVN_NO_ERROR;
}
apr_pool_t *
svn_root_pools__acquire_pool(svn_root_pools__t *pools)
{
apr_pool_t *pool;
svn_error_t *err = acquire_pool_internal(&pool, pools);
if (err)
{
/* Mutex failure?! Well, try to continue with unrecycled data. */
svn_error_clear(err);
pool = apr_allocator_owner_get(svn_pool_create_allocator(FALSE));
}
return pool;
}
void
svn_root_pools__release_pool(apr_pool_t *pool,
svn_root_pools__t *pools)
{
svn_error_t *err;
svn_pool_clear(pool);
err = svn_mutex__lock(pools->mutex);
if (err)
{
svn_error_clear(err);
svn_pool_destroy(pool);
}
else
{
APR_ARRAY_PUSH(pools->unused_pools, apr_pool_t *) = pool;
svn_error_clear(svn_mutex__unlock(pools->mutex, SVN_NO_ERROR));
}
}
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