Merge commit '65f1d45dcc71186ede72fff950996099d23359bd'

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

Conflicts:
	configure

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

1 files changed, 74 insertions, 0 deletions

diff --git a/libavutil/atomic.h b/libavutil/atomic.h
new file mode 100644
index 0000000000..14d334f19c
--- /dev/null
+++ b/libavutil/atomic.h
@@ -0,0 +1,74 @@
+/*
+ * 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
+ */
+
+#ifndef AVUTIL_ATOMIC_H
+#define AVUTIL_ATOMIC_H
+
+#include "config.h"
+
+#if HAVE_MEMORYBARRIER
+#include "atomic_win32.h"
+#elif HAVE_SYNC_SYNCHRONIZE
+#include "atomic_gcc.h"
+#elif HAVE_MACHINE_RW_BARRIER
+#include "atomic_suncc.h"
+#else
+
+/**
+ * Load the current value stored in an atomic integer.
+ *
+ * @param ptr atomic integer
+ * @return the current value of the atomic integer
+ * @note This acts as a memory barrier.
+ */
+int avpriv_atomic_int_get(volatile int *ptr);
+
+/**
+ * Store a new value in an atomic integer.
+ *
+ * @param ptr atomic integer
+ * @param val the value to store in the atomic integer
+ * @note This acts as a memory barrier.
+ */
+void avpriv_atomic_int_set(volatile int *ptr, int val);
+
+/**
+ * Add a value to an atomic integer.
+ *
+ * @param ptr atomic integer
+ * @param inc the value to add to the atomic integer (may be negative)
+ * @return the new value of the atomic integer.
+ * @note This does NOT act as a memory barrier. This is primarily
+ *       intended for reference counting.
+ */
+int avpriv_atomic_int_add_and_fetch(volatile int *ptr, int inc);
+
+/**
+ * Atomic pointer compare and swap.
+ *
+ * @param ptr pointer to the pointer to operate on
+ * @param oldval do the swap if the current value of *ptr equals to oldval
+ * @param newval value to replace *ptr with
+ * @return the value of *ptr before comparison
+ */
+void *avpriv_atomic_ptr_cas(void * volatile *ptr, void *oldval, void *newval);
+
+#endif /* HAVE_MEMORYBARRIER */
+#endif /* AVUTIL_ATOMIC_H */