LGPL

[vlc] / include / vlc_atomic.h

diff --git a/include/vlc_atomic.h b/include/vlc_atomic.h
index 48c2cbbabaf0a60f9aea4b6898f82d7ac2a03c0d..67aff9a05f381f33ef96893274353762561b8f2a 100644 (file)
--- a/include/vlc_atomic.h
+++ b/include/vlc_atomic.h
@@ -3,19 +3,19 @@
  *****************************************************************************
  * 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
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 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.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser 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.
+ * You should have received a copy of the GNU Lesser 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
@@ -26,6 +26,9 @@
  * Atomic operations do not require locking, but they are not very powerful.
  */
 
+/** Static initializer for \ref vlc_atomic_t */
+# define VLC_ATOMIC_INIT(val) { (val) }
+
 /* All functions return the atom value _after_ the operation. */
 
 VLC_API uintptr_t vlc_atomic_get(const vlc_atomic_t *);
@@ -50,4 +53,21 @@ static inline uintptr_t vlc_atomic_dec (vlc_atomic_t *atom)
 VLC_API uintptr_t vlc_atomic_swap(vlc_atomic_t *, uintptr_t);
 VLC_API uintptr_t vlc_atomic_compare_swap(vlc_atomic_t *, uintptr_t, uintptr_t);
 
+/** Helper to retrieve a single precision from an atom. */
+static inline float vlc_atomic_getf(const vlc_atomic_t *atom)
+{
+    union { float f; uintptr_t i; } u;
+    u.i = vlc_atomic_get(atom);
+    return u.f;
+}
+
+/** Helper to store a single precision into an atom. */
+static inline float vlc_atomic_setf(vlc_atomic_t *atom, float f)
+{
+    union { float f; uintptr_t i; } u;
+    u.f = f;
+    vlc_atomic_set(atom, u.i);
+    return f;
+}
+
 #endif