Revert "Rewrite atomic.h to use stdatomic.h."
This reverts commit cb344d464009337c283431dec4441b70481d1a49.
Change-Id: Ib17cd8d00695062177ce863cedc4ec7148012317
diff --git a/include/cutils/atomic-inline.h b/include/cutils/atomic-inline.h
index 103c5b0..a31e913 100644
--- a/include/cutils/atomic-inline.h
+++ b/include/cutils/atomic-inline.h
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2014 The Android Open Source Project
+ * Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -14,6 +14,59 @@
* limitations under the License.
*/
-#ifndef ANDROID_CUTILS_ATOMIC_H
-#include <cutils/atomic.h>
+#ifndef ANDROID_CUTILS_ATOMIC_INLINE_H
+#define ANDROID_CUTILS_ATOMIC_INLINE_H
+
+#ifdef __cplusplus
+extern "C" {
#endif
+
+/*
+ * Inline declarations and macros for some special-purpose atomic
+ * operations. These are intended for rare circumstances where a
+ * memory barrier needs to be issued inline rather than as a function
+ * call.
+ *
+ * Most code should not use these.
+ *
+ * Anything that does include this file must set ANDROID_SMP to either
+ * 0 or 1, indicating compilation for UP or SMP, respectively.
+ *
+ * Macros defined in this header:
+ *
+ * void ANDROID_MEMBAR_FULL(void)
+ * Full memory barrier. Provides a compiler reordering barrier, and
+ * on SMP systems emits an appropriate instruction.
+ */
+
+#if !defined(ANDROID_SMP)
+# error "Must define ANDROID_SMP before including atomic-inline.h"
+#endif
+
+#if defined(__aarch64__)
+#include <cutils/atomic-arm64.h>
+#elif defined(__arm__)
+#include <cutils/atomic-arm.h>
+#elif defined(__i386__)
+#include <cutils/atomic-x86.h>
+#elif defined(__x86_64__)
+#include <cutils/atomic-x86_64.h>
+#elif defined(__mips64)
+#include <cutils/atomic-mips64.h>
+#elif defined(__mips__)
+#include <cutils/atomic-mips.h>
+#else
+#error atomic operations are unsupported
+#endif
+
+#if ANDROID_SMP == 0
+#define ANDROID_MEMBAR_FULL android_compiler_barrier
+#else
+#define ANDROID_MEMBAR_FULL android_memory_barrier
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ANDROID_CUTILS_ATOMIC_INLINE_H */