+/*****************************************************************************
+ * vlc_atomic.h:
+ *****************************************************************************
+ * Copyright (C) 2010 Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifndef VLC_ATOMIC_H
+# define VLC_ATOMIC_H
+
+/**
+ * \file
+ * Atomic operations do not require locking, but they are not very powerful.
+ */
+
+/**
+ * Memory storage space for an atom. Never access it directly.
+ */
+typedef union
+{
+ uintptr_t u;
+ intptr_t s;
+} vlc_atomic_t;
+
+/* All functions return the atom value _after_ the operation. */
+
+VLC_EXPORT(uintptr_t, vlc_atomic_get, (const vlc_atomic_t *));
+VLC_EXPORT(uintptr_t, vlc_atomic_set, (vlc_atomic_t *, uintptr_t));
+VLC_EXPORT(uintptr_t, vlc_atomic_add, (vlc_atomic_t *, uintptr_t));
+
+static inline uintptr_t vlc_atomic_sub (vlc_atomic_t *atom, uintptr_t v)
+{
+ return vlc_atomic_add (atom, -v);
+}
+
+static inline uintptr_t vlc_atomic_inc (vlc_atomic_t *atom)
+{
+ return vlc_atomic_add (atom, 1);
+}
+
+static inline uintptr_t vlc_atomic_dec (vlc_atomic_t *atom)
+{
+ return vlc_atomic_sub (atom, 1);
+}
+
+#endif