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

src/execution.h

 // Copyright 2006-2008 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 236 matching lines @@
 #endif
 
   class ThreadLocal {
    public:
     ThreadLocal() { Clear(); }
     // You should hold the ExecutionAccess lock when you call Initialize or
     // Clear.
     void Clear();
 
     // Returns true if the heap's stack limits should be set, false if not.
-    bool Initialize();
+    bool Initialize(Isolate* isolate);
 
     // The stack limit is split into a JavaScript and a C++ stack limit. These
     // two are the same except when running on a simulator where the C++ and
     // JavaScript stacks are separate. Each of the two stack limits have two
     // values. The one eith the real_ prefix is the actual stack limit
     // set for the VM. The one without the real_ prefix has the same value as
     // the actual stack limit except when there is an interruption (e.g. debug
     // break or preemption) in which case it is lowered to make stack checks
     // fail. Both the generated code and the runtime system check against the
     // one without the real_ prefix.
@@ skipping 16 matching lines @@
   friend class StackLimitCheck;
   friend class PostponeInterruptsScope;
 
   DISALLOW_COPY_AND_ASSIGN(StackGuard);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_EXECUTION_H_