Merge commit '65f1d45dcc71186ede72fff950996099d23359bd'

* commit '65f1d45dcc71186ede72fff950996099d23359bd':
  lavu: add support for atomic operations.

Conflicts:
	configure

Merged-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 48 insertions, 0 deletions

diff --git a/libavutil/atomic_gcc.h b/libavutil/atomic_gcc.h
new file mode 100644
index 0000000000..57c20bbe40
--- /dev/null
+++ b/libavutil/atomic_gcc.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "atomic.h"
+
+#define avpriv_atomic_int_get atomic_int_get_gcc
+static inline int atomic_int_get_gcc(volatile int *ptr)
+{
+    __sync_synchronize();
+    return *ptr;
+}
+
+#define avpriv_atomic_int_set atomic_int_set_gcc
+static inline void atomic_int_set_gcc(volatile int *ptr, int val)
+{
+    *ptr = val;
+    __sync_synchronize();
+}
+
+#define avpriv_atomic_int_add_and_fetch atomic_int_add_and_fetch_gcc
+static inline int atomic_int_add_and_fetch_gcc(volatile int *ptr, int inc)
+{
+    return __sync_add_and_fetch(ptr, inc);
+}
+
+#define avpriv_atomic_ptr_cas atomic_ptr_cas_gcc
+static inline void *atomic_ptr_cas_gcc(void * volatile *ptr,
+                                       void *oldval, void *newval)
+{
+    return __sync_val_compare_and_swap(ptr, oldval, newval);
+}