Some thread data simplifications.

src/isolate.h

 // Copyright 2012 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
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   // The per-process lock should be acquired before the ThreadDataTable is
   // modified.
   class ThreadDataTable {
    public:
     ThreadDataTable();
     ~ThreadDataTable();
 
     PerIsolateThreadData* Lookup(Isolate* isolate, ThreadId thread_id);
     void Insert(PerIsolateThreadData* data);
-    void Remove(Isolate* isolate, ThreadId thread_id);
     void Remove(PerIsolateThreadData* data);
     void RemoveAllThreads(Isolate* isolate);
 
    private:
     PerIsolateThreadData* list_;
   };
 
   // These items form a stack synchronously with threads Enter'ing and Exit'ing
   // the Isolate. The top of the stack points to a thread which is currently
   // running the Isolate. When the stack is empty, the Isolate is considered
@@ skipping 14 matching lines @@
     PerIsolateThreadData* previous_thread_data;
     Isolate* previous_isolate;
     EntryStackItem* previous_item;
 
    private:
     DISALLOW_COPY_AND_ASSIGN(EntryStackItem);
   };
 
   // This mutex protects highest_thread_id_, thread_data_table_ and
   // default_isolate_.
-  static RecursiveMutex process_wide_mutex_;
+  static Mutex process_wide_mutex_;
 
   static Thread::LocalStorageKey per_isolate_thread_data_key_;
   static Thread::LocalStorageKey isolate_key_;
   static Thread::LocalStorageKey thread_id_key_;
   static Isolate* default_isolate_;
   static ThreadDataTable* thread_data_table_;
 
   // A global counter for all generated Isolates, might overflow.
   static Atomic32 isolate_counter_;
 
   void Deinit();
 
   static void SetIsolateThreadLocals(Isolate* isolate,
                                      PerIsolateThreadData* data);
 
-  // Allocate and insert PerIsolateThreadData into the ThreadDataTable
-  // (regardless of whether such data already exists).
-  PerIsolateThreadData* AllocatePerIsolateThreadData(ThreadId thread_id);
-
   // Find the PerThread for this particular (isolate, thread) combination.
   // If one does not yet exist, allocate a new one.
   PerIsolateThreadData* FindOrAllocatePerThreadDataForThisThread();
 
   // Initializes the current thread to run this Isolate.
   // Not thread-safe. Multiple threads should not Enter/Exit the same isolate
   // at the same time, this should be prevented using external locking.
   void Enter();
 
   // Exits the current thread. The previosuly entered Isolate is restored
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 // Mark the native context with out of memory.
 inline void Context::mark_out_of_memory() {
   native_context()->set_out_of_memory(HEAP->true_value());
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_