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

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

*** 386,405 ****
              unsafe.freeMemory(a);
          }
          return byteOrder;
      }
  
!     // Cache for page size
      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;
      }
  
  }
--- 386,409 ----
              unsafe.freeMemory(a);
          }
          return byteOrder;
      }
  
!     /**
!      * 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() {
!         int value = pageSize;
!         if (value == -1)
!             pageSize = value = unsafe.pageSize();
!         return value;
      }
  
  }