*** old/src/share/vm/runtime/os.cpp	Sun Sep 16 22:24:14 2012
--- new/src/share/vm/runtime/os.cpp	Sun Sep 16 22:24:13 2012

*** 199,216 ****
--- 199,223 ----
      assert(false, "Should not happen");
      return OS_ERR;
    }
  }
  
  
+ // The mapping from OS priority back to Java priority may be inexact because
+ // Java priorities can map M:1 with native priorities. If you want the definite
+ // Java priority then use JavaThread::java_priority()
  OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) {
    int p;
    int os_prio;
    OSReturn ret = get_native_priority(thread, &os_prio);
    if (ret != OS_OK) return ret;
  
+   if (java_to_os_priority[MaxPriority] > java_to_os_priority[MinPriority]) {
      for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ;
+   } else {
+     // niceness values are in reverse order
+     for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] < os_prio; p--) ;
+   }
    priority = (ThreadPriority)p;
    return OS_OK;
  }