Add support for forceful termination of JavaScript execution.

src/v8threads.h

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 32 matching lines @@
 
   void LinkInto(List list);
   void Unlink();
 
   static ThreadState* GetFree();
 
   // Id of thread.
   void set_id(int id) { id_ = id; }
   int id() { return id_; }
 
+  // Should the thread be terminated when it is restored?
+  bool terminate_on_restore() { return terminate_on_restore_; }
+  void set_terminate_on_restore(bool terminate_on_restore) {
+    terminate_on_restore_ = terminate_on_restore;
+  }
+
   // Get data area for archiving a thread.
   char* data() { return data_; }
  private:
   ThreadState();
 
   void AllocateSpace();
 
   int id_;
+  bool terminate_on_restore_;
   char* data_;
   ThreadState* next_;
   ThreadState* previous_;
 
   // In the following two lists there is always at least one object on the list.
   // The first object is a flying anchor that is only there to simplify linking
   // and unlinking.
   // Head of linked list of free states.
   static ThreadState* free_anchor_;
   // Head of linked list of states in use.
@@ skipping 10 matching lines @@
   static bool RestoreThread();
 
   static void Iterate(ObjectVisitor* v);
   static void MarkCompactPrologue(bool is_compacting);
   static void MarkCompactEpilogue(bool is_compacting);
   static bool IsLockedByCurrentThread() { return mutex_owner_.IsSelf(); }
 
   static int CurrentId();
   static void AssignId();
 
+  static void TerminateExecution(int thread_id);
+
   static const int kInvalidId = -1;
  private:
   static void EagerlyArchiveThread();
 
   static int next_id_;  // V8 threads are identified through an integer.
   static Mutex* mutex_;
   static ThreadHandle mutex_owner_;
   static ThreadHandle lazily_archived_thread_;
   static ThreadState* lazily_archived_thread_state_;
 };
@@ skipping 22 matching lines @@
 
   bool keep_going_;
   int sleep_ms_;
 
   static ContextSwitcher* singleton_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8THREADS_H_