/*
 * astobj2_global - global containers for AO2 objects.
 *
 * Copyright (C) 2006 Marta Carbone, Luigi Rizzo - Univ. di Pisa, Italy
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Functions implementing ao2_global_obj routines.
 *
 * \author Richard Mudgett <rmudgett@digium.com>
 */

/*** MODULEINFO
	<support_level>core</support_level>
 ***/

#include "asterisk.h"

#include "asterisk/astobj2.h"
#include "asterisk/utils.h"

void *__ao2_global_obj_replace(struct ao2_global_obj *holder, void *obj, const char *tag, const char *file, int line, const char *func, const char *name)
{
	void *obj_old;

	if (!holder) {
		/* For sanity */
		ast_log(LOG_ERROR, "Must be called with a global object!\n");
		ast_assert(0);
		return NULL;
	}
	if (__ast_rwlock_wrlock(file, line, func, &holder->lock, name)) {
		/* Could not get the write lock. */
		ast_assert(0);
		return NULL;
	}

	if (obj) {
		__ao2_ref(obj, +1, tag, file, line, func);
	}
	obj_old = holder->obj;
	holder->obj = obj;

	__ast_rwlock_unlock(file, line, func, &holder->lock, name);

	return obj_old;
}

int __ao2_global_obj_replace_unref(struct ao2_global_obj *holder, void *obj, const char *tag, const char *file, int line, const char *func, const char *name)
{
	void *obj_old;

	obj_old = __ao2_global_obj_replace(holder, obj, tag, file, line, func, name);
	if (obj_old) {
		__ao2_ref(obj_old, -1, tag, file, line, func);
		return 1;
	}
	return 0;
}

void *__ao2_global_obj_ref(struct ao2_global_obj *holder, const char *tag, const char *file, int line, const char *func, const char *name)
{
	void *obj;

	if (!holder) {
		/* For sanity */
		ast_log(LOG_ERROR, "Must be called with a global object!\n");
		ast_assert(0);
		return NULL;
	}

	if (__ast_rwlock_rdlock(file, line, func, &holder->lock, name)) {
		/* Could not get the read lock. */
		ast_assert(0);
		return NULL;
	}

	obj = holder->obj;
	if (obj) {
		__ao2_ref(obj, +1, tag, file, line, func);
	}

	__ast_rwlock_unlock(file, line, func, &holder->lock, name);

	return obj;
}