jdk/src/share/classes/java/lang/Thread.java

*** 1991,2006 ****
          }
      }
  
  
      // The following three initially uninitialized fields are exclusively
!     // managed by class java.util.concurrent.ThreadLocalRandom.
      /** The current seed for a ThreadLocalRandom */
      long threadLocalRandomSeed;
      /** Probe hash value; nonzero if threadLocalRandomSeed initialized */
      int threadLocalRandomProbe;
      /** Secondary seed isolated from public ThreadLocalRandom sequence */
      int threadLocalRandomSecondarySeed;
  
      /* Some private helper methods */
      private native void setPriority0(int newPriority);
      private native void stop0(Object o);
--- 1991,2015 ----
          }
      }
  
  
      // The following three initially uninitialized fields are exclusively
!     // managed by class java.util.concurrent.ThreadLocalRandom. These
!     // fields are used to build the high-performance PRNGs in the
!     // concurrent code, and we can not risk accidental false sharing.
!     // Hence, the fields are isolated with @Contended.
! 
      /** The current seed for a ThreadLocalRandom */
+     @sun.misc.Contended("tlr")
      long threadLocalRandomSeed;
+ 
      /** Probe hash value; nonzero if threadLocalRandomSeed initialized */
+     @sun.misc.Contended("tlr")
      int threadLocalRandomProbe;
+ 
      /** Secondary seed isolated from public ThreadLocalRandom sequence */
+     @sun.misc.Contended("tlr")
      int threadLocalRandomSecondarySeed;
  
      /* Some private helper methods */
      private native void setPriority0(int newPriority);
      private native void stop0(Object o);