src/java.base/share/classes/java/net/InetAddress.java

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

*** 288,298 ****
      }
  
      /* Used to store the name service provider */
      private static transient NameService nameService = null;
  
!     /* Used to store the best available hostname */
      private transient String canonicalHostName = null;
  
      /** use serialVersionUID from JDK 1.0.2 for interoperability */
      private static final long serialVersionUID = 3286316764910316507L;
  
--- 288,301 ----
      }
  
      /* Used to store the name service provider */
      private static transient NameService nameService = null;
  
!     /**
!      * Used to store the best available hostname.
!      * Lazily initialized via a data race; safe because Strings are immutable.
!      */
      private transient String canonicalHostName = null;
  
      /** use serialVersionUID from JDK 1.0.2 for interoperability */
      private static final long serialVersionUID = 3286316764910316507L;
  
*** 620,634 ****
       * @see SecurityManager#checkConnect
       *
       * @since 1.4
       */
      public String getCanonicalHostName() {
!         if (canonicalHostName == null) {
!             canonicalHostName =
                  InetAddress.getHostFromNameService(this, true);
!         }
!         return canonicalHostName;
      }
  
      /**
       * Returns the hostname for this address.
       *
--- 623,637 ----
       * @see SecurityManager#checkConnect
       *
       * @since 1.4
       */
      public String getCanonicalHostName() {
!         String value = canonicalHostName;
!         if (value == null)
!             canonicalHostName = value =
                  InetAddress.getHostFromNameService(this, true);
!         return value;
      }
  
      /**
       * Returns the hostname for this address.
       *