include/babeltrace/ref-internal.h

   1 #ifndef BABELTRACE_REF_INTERNAL_H
   2 #define BABELTRACE_REF_INTERNAL_H
   3
   4 /*
   5  * Babeltrace - reference counting
   6  *
   7  * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   8  *
   9  * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a copy
  12  * of this software and associated documentation files (the "Software"), to deal
  13  * in the Software without restriction, including without limitation the rights
  14  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  15  * copies of the Software, and to permit persons to whom the Software is
  16  * furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included in
  19  * all copies or substantial portions of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  24  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  26  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  27  * SOFTWARE.
  28  */
  29
  30 #include <assert.h>
  31
  32 struct bt_ref;
  33
  34 typedef void (*bt_ref_release_func_t)(struct bt_ref *);
  35
  36 struct bt_ref {
  37         long refcount;
  38         bt_ref_release_func_t release_func;
  39 };
  40
  41 static inline
  42 void bt_ref_init(struct bt_ref *ref,
  43         bt_ref_release_func_t release_func)
  44 {
  45         assert(ref);
  46         ref->refcount = 1;
  47         ref->release_func = release_func;
  48 }
  49
  50 static inline
  51 void bt_ref_get(struct bt_ref *ref)
  52 {
  53         assert(ref);
  54         ref->refcount++;
  55 }
  56
  57 static inline
  58 void bt_ref_put(struct bt_ref *ref)
  59 {
  60         assert(ref);
  61         assert(ref->release_func);
  62         if ((--ref->refcount) == 0) {
  63                 ref->release_func(ref);
  64         }
  65 }
  66
  67 #endif /* BABELTRACE_REF_INTERNAL_H */