include/vlc_atomic.h

   1 /*****************************************************************************
   2  * vlc_atomic.h:
   3  *****************************************************************************
   4  * Copyright (C) 2010 Rémi Denis-Courmont
   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
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifndef VLC_ATOMIC_H
  22 # define VLC_ATOMIC_H
  23
  24 /**
  25  * \file
  26  * Atomic operations do not require locking, but they are not very powerful.
  27  */
  28
  29 /* All functions return the atom value _after_ the operation. */
  30
  31 VLC_EXPORT(uintptr_t, vlc_atomic_get, (const vlc_atomic_t *));
  32 VLC_EXPORT(uintptr_t, vlc_atomic_set, (vlc_atomic_t *, uintptr_t));
  33 VLC_EXPORT(uintptr_t, vlc_atomic_add, (vlc_atomic_t *, uintptr_t));
  34
  35 static inline uintptr_t vlc_atomic_sub (vlc_atomic_t *atom, uintptr_t v)
  36 {
  37     return vlc_atomic_add (atom, -v);
  38 }
  39
  40 static inline uintptr_t vlc_atomic_inc (vlc_atomic_t *atom)
  41 {
  42     return vlc_atomic_add (atom, 1);
  43 }
  44
  45 static inline uintptr_t vlc_atomic_dec (vlc_atomic_t *atom)
  46 {
  47     return vlc_atomic_sub (atom, 1);
  48 }
  49
  50 #endif