/usr/include/dnscore/rc.h is in libyadifa-dev 2.1.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* Copyright (c) 2011-2016, EURid. All rights reserved.
* The YADIFA TM software product is provided under the BSD 3-clause license:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of EURid nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*------------------------------------------------------------------------------
*
*/
/** @defgroup
* @ingroup dnscore
* @brief
*
*
*
* @{
*
*----------------------------------------------------------------------------*/
#pragma once
/**
*
* The RC struct helps having a structure referenced by multiple concurrent threads
* released when nobody uses it anymore.
*
*/
#include <dnscore/mutex.h>
#ifdef __cplusplus
extern "C"
{
#endif
typedef void rc_free_method(void*);
struct rc_vtbl
{
rc_free_method *free_callback;
mutex_t *mtx;
};
typedef struct rc_vtbl rc_vtbl;
/**
* Initialises an RC vtbl.
* The callback is called to free the struct when its last reference is released.
* The mutex is meant to be shared trough a struct type.
*
* @param spvtbl
* @param free_callback
* @param mtx
*/
void rc_init_vtbl(rc_vtbl *spvtbl, rc_free_method *free_callback, mutex_t *mtx);
void rc_finalise_vtbl(rc_vtbl *spvtbl);
struct rc_s
{
rc_vtbl *vtbl;
s32 count;
};
typedef struct rc_s rc_s;
/**
* struct whatever
* {
* RC_COUNTER;
* int brol;
* };
*
* alloc:
* struct whatever *w = malloc & create & cie;
* rc_acquire(w);
* return w;
*
* get:
* rc_acquire(w);
* return w;
*
*
* rc_release(w);
* w = NULL;
*
*/
#define RC_COUNTER struct rc_s __reference_counter
void rc_set_internal(rc_s *rc, rc_vtbl *vtbl);
void rc_aquire_internal(rc_s *rc);
void rc_release_internal(rc_s *rc, void *data);
#define rc_set(__structptr__, spvtbl) \
rc_set_internal((__structptr__), &((__structptr__)->__reference_counter));
/**
* The typical place of an rc_acquire is before returning the variable.
*/
#define rc_aquire(__structptr__, spvtbl) \
rc_aquire_internal(&((__struct_ptr__)->__reference_counter))
/**
* An rc_release SHOULD be followed by the variable being set to NULL.
*/
#define rc_release(__struct_ptr__) \
rc_release_internal(&((__struct_ptr__)->__reference_counter), (__struct_ptr__))
#ifdef __cplusplus
}
#endif
/** @} */
/*----------------------------------------------------------------------------*/
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