| Index: include/v8.h | 
| diff --git a/include/v8.h b/include/v8.h | 
| index 83b777d30948104bec43ba3c9926cd68ff637690..18a3892f74fc6bf6801c26fecaebb89b505d5f8d 100644 | 
| --- a/include/v8.h | 
| +++ b/include/v8.h | 
| @@ -6296,6 +6296,12 @@ class V8_EXPORT Isolate { | 
| */ | 
| void VisitWeakHandles(PersistentHandleVisitor* visitor); | 
|  | 
| +  /** | 
| +   * Check if this isolate is in use. | 
| +   * True if at least one thread Enter'ed this isolate. | 
| +   */ | 
| +  bool IsInUse(); | 
| + | 
| private: | 
| template <class K, class V, class Traits> | 
| friend class PersistentValueMapBase; | 
|  |