common/refcount.h

   1 /*
   2  * refcount.h - useful reference counter handling header
   3  *
   4  * Copyright © 2008 Julien Danjou <julien@danjou.info>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21 #ifndef AWESOME_COMMON_REFCOUNT_H
  22 #define AWESOME_COMMON_REFCOUNT_H
  23
  24 #include <assert.h>
  25
  26 #define DO_RCNT(type, prefix, dtor)                                            \
  27     static inline void prefix##_unref(type **item)                             \
  28     {                                                                          \
  29         if(*item && --(*item)->refcount <= 0)                                  \
  30             dtor(item);                                                        \
  31     }                                                                          \
  32                                                                                \
  33     static inline type *prefix##_ref(type **item)                              \
  34     {                                                                          \
  35         (*item)->refcount++;                                                   \
  36         return *item;                                                          \
  37     }
  38
  39 #endif
  40 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80