src/java.base/share/classes/java/util/concurrent/locks/LockSupport.java

*** 139,149 ****
  public class LockSupport {
      private LockSupport() {} // Cannot be instantiated.
  
      private static void setBlocker(Thread t, Object arg) {
          // Even though volatile, hotspot doesn't need a write barrier here.
!         U.putObject(t, PARKBLOCKER, arg);
      }
  
      /**
       * Makes available the permit for the given thread, if it
       * was not already available.  If the thread was blocked on
--- 139,149 ----
  public class LockSupport {
      private LockSupport() {} // Cannot be instantiated.
  
      private static void setBlocker(Thread t, Object arg) {
          // Even though volatile, hotspot doesn't need a write barrier here.
!         U.putReference(t, PARKBLOCKER, arg);
      }
  
      /**
       * Makes available the permit for the given thread, if it
       * was not already available.  If the thread was blocked on
*** 289,299 ****
       * @since 1.6
       */
      public static Object getBlocker(Thread t) {
          if (t == null)
              throw new NullPointerException();
!         return U.getObjectVolatile(t, PARKBLOCKER);
      }
  
      /**
       * Disables the current thread for thread scheduling purposes unless the
       * permit is available.
--- 289,299 ----
       * @since 1.6
       */
      public static Object getBlocker(Thread t) {
          if (t == null)
              throw new NullPointerException();
!         return U.getReferenceVolatile(t, PARKBLOCKER);
      }
  
      /**
       * Disables the current thread for thread scheduling purposes unless the
       * permit is available.