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/*
SSSD
Simple reference counting wrappers for talloc.
Authors:
Martin Nagy <mnagy@redhat.com>
Copyright (C) Red Hat, Inc 2009
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __REFCOUNT_H__
#define __REFCOUNT_H__
#include <stddef.h>
#define REFCOUNT_MEMBER_NAME DO_NOT_TOUCH_THIS_MEMBER_refcount
/*
* Include this member in your structure in order to be able to use it with
* the refcount_* functions.
*/
#define REFCOUNT_COMMON int REFCOUNT_MEMBER_NAME
/*
* Allocate a new structure that uses reference counting. The resulting pointer
* returned. You must not free the returned pointer manually. It will be freed
* when 'ctx' is freed with talloc_free() and no other references are left.
*/
#define rc_alloc(ctx, type) \
(type *)_rc_alloc(ctx, sizeof(type), offsetof(type, REFCOUNT_MEMBER_NAME), \
#type)
/*
* Increment the reference count of 'src' and return it back if we are
* successful. The reference count will be decremented after 'ctx' has been
* released by talloc_free(). The function will return NULL in case of failure.
*/
#define rc_reference(ctx, type, src) \
(type *)_rc_reference(ctx, offsetof(type, REFCOUNT_MEMBER_NAME), src)
/*
* These functions should not be used directly. Use the above macros instead.
*/
void *_rc_alloc(const void *context, size_t size, size_t refcount_offset,
const char *type_name);
void *_rc_reference(const void *context, size_t refcount_offset, void *source);
#endif /* !__REFCOUNT_H__ */
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