Per-isolate v8::Locker and v8::Unlocker

src/api.h

 // Copyright 2011 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 381 matching lines @@
 // neat in some ways, but it would expose internal implementation details in
 // our public header file, which is undesirable.
 //
 // An isolate has a single instance of this class to hold the current thread's
 // data. In multithreaded V8 programs this data is copied in and out of storage
 // so that the currently executing thread always has its own copy of this
 // data.
 ISOLATED_CLASS HandleScopeImplementer {
  public:
 
-  HandleScopeImplementer()
-      : blocks_(0),
+  explicit HandleScopeImplementer(Isolate* isolate)
+      : isolate_(isolate),
+        blocks_(0),
         entered_contexts_(0),
         saved_contexts_(0),
         spare_(NULL),
         ignore_out_of_memory_(false),
         call_depth_(0) { }
 
   // Threading support for handle data.
   static int ArchiveSpacePerThread();
   char* RestoreThread(char* from);
   char* ArchiveThread(char* to);
@@ skipping 45 matching lines @@
     blocks_.Free();
     entered_contexts_.Free();
     saved_contexts_.Free();
     if (spare_ != NULL) {
       DeleteArray(spare_);
       spare_ = NULL;
     }
     ASSERT(call_depth_ == 0);
   }
 
+  Isolate* isolate_;
   List<internal::Object**> blocks_;
   // Used as a stack to keep track of entered contexts.
   List<Handle<Object> > entered_contexts_;
   // Used as a stack to keep track of saved contexts.
   List<Context*> saved_contexts_;
   Object** spare_;
   bool ignore_out_of_memory_;
   int call_depth_;
   // This is only used for threading support.
   v8::ImplementationUtilities::HandleScopeData handle_scope_data_;
@@ skipping 84 matching lines @@
     stress_type_ = stress_type;
   }
 
  private:
   static v8::Testing::StressType stress_type_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_API_H_