Merge pull request #48 from Roman-Koshelev/master

"First steps towards cross-platform" - This series of commits by Roman-Koshelev abstracts GCC specific attributes to macros and replaces RAMCloud's Atomic.h with the standard implementation.

Author: syang0

runtime/Atomic.h

@@ -18,6 +18,7 @@
 
 #include <stdint.h>
 
+#include "Portability.h"
 
 namespace PerfUtils {
 
@@ -34,21 +35,21 @@ class Cycles {
      * Return the current value of the fine-grain CPU cycle counter
      * (accessed via the RDTSC instruction).
      */
-    static __inline __attribute__((always_inline))
+    static NANOLOG_ALWAYS_INLINE
     uint64_t
     rdtsc()
     {
 #if TESTING
         if (mockTscValue)
             return mockTscValue;
 #endif
-        uint32_t lo, hi;
+        size_t lo, hi;
         __asm__ __volatile__("rdtsc" : "=a" (lo), "=d" (hi));
 //        __asm__ __volatile__("rdtscp" : "=a" (lo), "=d" (hi) : : "%rcx");
         return (((uint64_t)hi << 32) | lo);
     }
 
-    static __inline __attribute__((always_inline))
+    static NANOLOG_ALWAYS_INLINE
     double
     perSecond(){
         return getCyclesPerSec();
@@ -80,7 +81,7 @@ class Cycles {
      * Returns the conversion factor between cycles in seconds, using
      * a mock value for testing when appropriate.
      */
-    static __inline __attribute__((always_inline))
+    static NANOLOG_ALWAYS_INLINE
     double
     getCyclesPerSec()
     {