[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/sdk_util/atomicops.h

 /* Copyright 2013 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef LIBRARIES_SDK_UTIL_ATOMICOPS_H_
 #define LIBRARIES_SDK_UTIL_ATOMICOPS_H_
 
 #ifndef WIN32
 
 #include <stdint.h>
+
+namespace sdk_util {
+
 typedef int32_t Atomic32;
 
 #ifndef __llvm__
 static inline void MemoryBarrier() {
   __sync_synchronize();
 }
 #endif
 
 inline Atomic32 AtomicCompareExchange(volatile Atomic32* ptr,
                                       Atomic32 new_value,
@@ skipping 10 matching lines @@
 }
 
 inline Atomic32 AtomicOrFetch(volatile Atomic32* ptr, Atomic32 value) {
   return __sync_or_and_fetch(ptr, value);
 }
 
 inline Atomic32 AtomicXorFetch(volatile Atomic32* ptr, Atomic32 value) {
   return __sync_xor_and_fetch(ptr, value);
 }
 
-#else
+}  // namespace sdk_util
+
+#else  // ifndef WIN32
 
 #include <windows.h>
 
 /* Undefine many Windows.h macros that we almost certainly do not want. */
 #undef min
 #undef max
 #undef PostMessage
 #undef interface
 
+namespace sdk_util {
+
 typedef long Atomic32;
 
 /* Windows.h already defines a MemoryBarrier macro. */
 
 inline Atomic32 AtomicCompareExchange(volatile Atomic32* ptr,
                                       Atomic32 newvalue,
                                       Atomic32 oldvalue) {
   return InterlockedCompareExchange(ptr, newvalue, oldvalue);
 }
 
@@ skipping 27 matching lines @@
   Atomic32 oldval;
   Atomic32 newval;
   do {
     oldval = *ptr;
     newval = oldval ^ value;
   } while (InterlockedCompareExchange(ptr,newval, oldval) != oldval);
 
   return newval;
 }
 
-#endif
+}  // namespace sdk_util
 
+#endif  // ifndef WIN32
 
 #endif  /* LIBRARIES_SDK_UTIL_ATOMICOPS_H_ */