src/java.base/share/classes/sun/nio/ch/NativeObject.java

8200131: Improve lazy init of InetAddress.canonicalHostName and NativeObject.pageSize
Reviewed-by: alanb

@@ -386,20 +386,24 @@
             unsafe.freeMemory(a);
         }
         return byteOrder;
     }
 
-    // Cache for page size
+    /**
+     * Cache for page size.
+     * Lazily initialized via a data race; safe because ints are atomic.
+     */
     private static int pageSize = -1;
 
     /**
      * Returns the page size of the underlying hardware.
      *
      * @return  The page size, in bytes
      */
     static int pageSize() {
-        if (pageSize == -1)
-            pageSize = unsafe.pageSize();
-        return pageSize;
+        int value = pageSize;
+        if (value == -1)
+            pageSize = value = unsafe.pageSize();
+        return value;
     }
 
 }