go back to ps #4

source/common/umutex.h

Index: source/common/umutex.h
diff --git a/source/common/umutex.h b/source/common/umutex.h
index e0ad0d3c03654d61a023a082548563d8d4c03c61..0e4d118523c874f34098d4038c2167ced663fd8e 100644
--- a/source/common/umutex.h
+++ b/source/common/umutex.h
@@ -1,6 +1,6 @@
 /*
 **********************************************************************
-*   Copyright (C) 1997-2014, International Business Machines
+*   Copyright (C) 1997-2015, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 **********************************************************************
 *
@@ -118,6 +118,33 @@ inline int32_t umtx_atomic_dec(u_atomic_int32_t *var) {
 U_NAMESPACE_END
 
 
+#elif U_HAVE_CLANG_ATOMICS
+/*
+ *  Clang __c11 atomic built-ins
+ */
+
+U_NAMESPACE_BEGIN
+typedef _Atomic(int32_t) u_atomic_int32_t;
+#define ATOMIC_INT32_T_INITIALIZER(val) val
+
+inline int32_t umtx_loadAcquire(u_atomic_int32_t &var) {
+     return __c11_atomic_load(&var, __ATOMIC_ACQUIRE);
+}
+
+inline void umtx_storeRelease(u_atomic_int32_t &var, int32_t val) {
+   return __c11_atomic_store(&var, val, __ATOMIC_RELEASE);
+}
+
+inline int32_t umtx_atomic_inc(u_atomic_int32_t *var) {
+    return __c11_atomic_fetch_add(var, 1, __ATOMIC_SEQ_CST) + 1;
+}
+
+inline int32_t umtx_atomic_dec(u_atomic_int32_t *var) {
+    return __c11_atomic_fetch_sub(var, 1, __ATOMIC_SEQ_CST) - 1;
+}
+U_NAMESPACE_END
+
+
 #elif U_HAVE_GCC_ATOMICS
 /*
  * gcc atomic ops. These are available on several other compilers as well.