1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2010 RĂ©mi Denis-Courmont
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.
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.
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 *****************************************************************************/
25 #include <vlc_common.h>
26 #include <vlc_atomic.h>
28 #if defined (__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
31 uintptr_t vlc_atomic_get (const vlc_atomic_t *atom)
33 __sync_synchronize ();
37 uintptr_t vlc_atomic_set (vlc_atomic_t *atom, uintptr_t v)
40 __sync_synchronize ();
44 uintptr_t vlc_atomic_add (vlc_atomic_t *atom, uintptr_t v)
46 return __sync_add_and_fetch (&atom->u, v);
50 /* Worst-case fallback implementation with a mutex */
52 static vlc_mutex_t lock = VLC_STATIC_MUTEX;
54 uintptr_t vlc_atomic_get (const vlc_atomic_t *atom)
58 vlc_mutex_lock (&lock);
60 vlc_mutex_unlock (&lock);
64 uintptr_t vlc_atomic_set (vlc_atomic_t *atom, uintptr_t v)
66 vlc_mutex_lock (&lock);
68 vlc_mutex_unlock (&lock);
72 uintptr_t vlc_atomic_add (vlc_atomic_t *atom, uintptr_t v)
74 vlc_mutex_lock (&lock);
77 vlc_mutex_unlock (&lock);