svn_dso.h

Go to the documentation of this file.

/**
 * @copyright
 * ====================================================================
 *    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.
 * ====================================================================
 * @endcopyright
 *
 * @file svn_dso.h
 * @brief DSO loading routines
 */



#ifndef SVN_DSO_H
#define SVN_DSO_H

#include <apr_dso.h>

#include "svn_types.h"

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/**
 * Initialize the DSO loading routines.
 *
 * @note This should be called prior to the creation of any pool that
 *       is passed to a function that comes from a DSO, otherwise you
 *       risk having the DSO unloaded before all pool cleanup callbacks
 *       that live in the DSO have been executed.  If it is not called
 *       prior to @c svn_dso_load being used for the first time there
 *       will be a best effort attempt made to initialize the subsystem,
 *       but it will not be entirely thread safe and it risks running
 *       into the previously mentioned problems with DSO unloading and
 *       pool cleanup callbacks.
 *
 * Returns svn_error_t object with corresponding apr_err returned by
 * underlying calls. In case of no error returns @c SVN_NO_ERROR.
 *
 * @since New in 1.6.
 */
svn_error_t *
svn_dso_initialize2(void);

/** The same as svn_dso_initialize2(), except that if there is an error this
 * calls abort() instead of returning the error.
 *
 * @deprecated Provided for backwards compatibility with the 1.5 API.
 *
 * @since New in 1.4.
 */
SVN_DEPRECATED
void
svn_dso_initialize(void);


#if APR_HAS_DSO

/**
 * Attempt to load @a libname, returning it in @a *dso.
 *
 * If @a libname cannot be loaded set @a *dso to NULL and return
 * @c SVN_NO_ERROR.
 *
 * @note Due to pool lifetime issues DSOs are all loaded into a global
 *       pool, so you must be certain that there is a bounded number of
 *       them that will ever be loaded by the system, otherwise you will
 *       leak memory.
 *
 * @since New in 1.4.
 */
svn_error_t *
svn_dso_load(apr_dso_handle_t **dso,
             const char *libname);

#endif /* APR_HAS_DSO */


#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* SVN_DSO_H */