Support 64-bit volatiles and reference/pointer volatiles.
Change-Id: I62c0751747767c02d6c57afd0fce3db6c8b02510
diff --git a/src/atomic.h b/src/atomic.h
new file mode 100644
index 0000000..e3e4fc0
--- /dev/null
+++ b/src/atomic.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2008 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.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_SRC_ATOMIC_H_
+#define ART_SRC_ATOMIC_H_
+
+#include <cutils/atomic.h> /* use common Android atomic ops */
+#include <cutils/atomic-inline.h> /* and some uncommon ones */
+
+namespace art {
+
+/*
+ * NOTE: Two "quasiatomic" operations on the exact same memory address
+ * are guaranteed to operate atomically with respect to each other,
+ * but no guarantees are made about quasiatomic operations mixed with
+ * non-quasiatomic operations on the same address, nor about
+ * quasiatomic operations that are performed on partially-overlapping
+ * memory.
+ *
+ * None of these provide a memory barrier.
+ */
+
+/*
+ * Swap the 64-bit value at "addr" with "value". Returns the previous
+ * value.
+ */
+int64_t QuasiAtomicSwap64(int64_t value, volatile int64_t* addr);
+
+/*
+ * Read the 64-bit value at "addr".
+ */
+int64_t QuasiAtomicRead64(volatile const int64_t* addr);
+
+/*
+ * If the value at "addr" is equal to "old_value", replace it with "new_value"
+ * and return 0. Otherwise, don't swap, and return nonzero.
+ */
+int QuasiAtomicCas64(int64_t old_value, int64_t new_value, volatile int64_t* addr);
+
+} // namespace art
+
+#endif // ART_SRC_ATOMIC_H_