1 /*------------------------------------------------------------------------------
2 *
3 * Copyright (c) 2011-2021, EURid vzw. All rights reserved.
4 * The YADIFA TM software product is provided under the BSD 3-clause license:
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * * Neither the name of EURid nor the names of its contributors may be
16 * used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 *
31 *------------------------------------------------------------------------------
32 *
33 */
34
35 /** @defgroup threading mutexes, ...
36 * @ingroup dnscore
37 * @brief
38 *
39 * @{
40 *
41 *----------------------------------------------------------------------------*/
42 #include "dnscore/dnscore-config.h"
43 #include <sys/types.h>
44 #include <unistd.h>
45 #include "dnscore/logger.h"
46
47 #include "dnscore/rc.h"
48
49 #define MODULE_MSG_HANDLE g_system_logger
50
51 void
rc_init_vtbl(rc_vtbl * vtbl,rc_free_method * free_callback,mutex_t * mtx)52 rc_init_vtbl(rc_vtbl *vtbl, rc_free_method *free_callback, mutex_t *mtx)
53 {
54 vtbl->free_callback = free_callback;
55 vtbl->mtx = mtx;
56 }
57
58 void
rc_finalize_vtbl(rc_vtbl * vtbl)59 rc_finalize_vtbl(rc_vtbl *vtbl)
60 {
61 vtbl->free_callback = NULL;
62 vtbl->mtx = NULL;
63 }
64
65 void
rc_set_internal(rc_s * rc,rc_vtbl * vtbl)66 rc_set_internal(rc_s *rc, rc_vtbl *vtbl)
67 {
68 rc->vtbl = vtbl;
69 rc->count = 0;
70 }
71
72 void
rc_aquire_internal(rc_s * rc)73 rc_aquire_internal(rc_s *rc)
74 {
75 mutex_lock(rc->vtbl->mtx);
76 ++rc->count;
77 mutex_unlock(rc->vtbl->mtx);
78 }
79
80 void
rc_release_internal(rc_s * rc,void * data)81 rc_release_internal(rc_s *rc, void *data)
82 {
83 mutex_lock(rc->vtbl->mtx);
84 if(--rc->count > 0)
85 {
86 mutex_unlock(rc->vtbl->mtx);
87 }
88 else
89 {
90 if(rc->count < 0)
91 {
92 // oopsie
93 log_err("negative RC count: %i rc=%p data=%p", rc->count, rc, data);
94 logger_flush(); // then abort()
95 abort();
96 }
97
98 mutex_unlock(rc->vtbl->mtx);
99 rc->vtbl->free_callback(data);
100 }
101 }
102