--- old/src/hotspot/share/oops/markOop.hpp	2019-04-25 11:54:10.471682470 +0200
+++ new/src/hotspot/share/oops/markOop.hpp	2019-04-25 11:54:09.722657244 +0200
@@ -177,6 +177,15 @@
     assert(has_bias_pattern(), "should not call this otherwise");
     return (JavaThread*) ((intptr_t) (mask_bits(value(), ~(biased_lock_mask_in_place | age_mask_in_place | epoch_mask_in_place))));
   }
+  bool biased_locker_is(JavaThread* thread) const {
+    if (!has_bias_pattern()) {
+      return false;
+    }
+    // If current thread is not the owner it can be unbiased at anytime.
+    JavaThread* jt = (JavaThread*) ((intptr_t) (mask_bits(value(), ~(biased_lock_mask_in_place | age_mask_in_place | epoch_mask_in_place))));
+    return jt == thread;
+  }
+
   // Indicates that the mark has the bias bit set but that it has not
   // yet been biased toward a particular thread
   bool is_biased_anonymously() const {