lib/ref.c

   1 /*
   2  * ref.c: reference counting
   3  *
   4  * Babeltrace Library
   5  *
   6  * Copyright (c) 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24  * SOFTWARE.
  25  */
  26
  27 #define BT_LOG_TAG "REF"
  28
  29 #include <babeltrace/lib-logging-internal.h>
  30 #include <babeltrace/ref-internal.h>
  31 #include <babeltrace/object-internal.h>
  32
  33 void *bt_get(void *ptr)
  34 {
  35         struct bt_object *obj = ptr;
  36
  37         if (unlikely(!obj)) {
  38                 goto end;
  39         }
  40
  41         if (unlikely(obj->parent && bt_object_get_ref_count(obj) == 0)) {
  42                 BT_LOGV("Incrementing object's parent's reference count: "
  43                         "addr=%p, parent-addr=%p", ptr, obj->parent);
  44                 bt_get(obj->parent);
  45         }
  46         bt_ref_get(&obj->ref_count);
  47         BT_LOGV("Incremented object's reference count: %lu -> %lu: "
  48                 "addr=%p, new-count=%lu", obj->ref_count.count - 1,
  49                 obj->ref_count.count, ptr, obj->ref_count.count);
  50 end:
  51         return obj;
  52 }
  53
  54 void bt_put(void *ptr)
  55 {
  56         struct bt_object *obj = ptr;
  57
  58         if (unlikely(!obj)) {
  59                 return;
  60         }
  61
  62         BT_LOGV("Decrementing object's reference count: %lu -> %lu: "
  63                 "addr=%p, cur-count=%lu", obj->ref_count.count,
  64                 obj->ref_count.count - 1, ptr, obj->ref_count.count);
  65         bt_ref_put(&obj->ref_count);
  66 }