Add thread information to the debugger

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 27 matching lines @@
   // Returns NULL after the last one.
   ThreadState* Next();
 
   enum List {FREE_LIST, IN_USE_LIST};
 
   void LinkInto(List list);
   void Unlink();
 
   static ThreadState* GetFree();
 
+  // Id of thread.
+  void set_id(int id) { id_ = id; }
+  int id() { return id_; }
+
   // Get data area for archiving a thread.
   char* data() { return data_; }
  private:
   ThreadState();
 
   void AllocateSpace();
 
+  int id_;
   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.
   static ThreadState* in_use_anchor_;
 };
 
 
 class ThreadManager : public AllStatic {
  public:
   static void Lock();
   static void Unlock();
 
   static void ArchiveThread();
   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 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_;
 };
 
 
 // The ContextSwitcher thread is used to schedule regular preemptions to
 // multiple running V8 threads. Generally it is necessary to call
 // StartPreemption if there is more than one thread running. If not, a single
@@ skipping 17 matching lines @@
 
   bool keep_going_;
   int sleep_ms_;
 
   static ContextSwitcher* singleton_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8THREADS_H_