--- /dev/null
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef SRC_NODE_INTERNALS_H_
+#define SRC_NODE_INTERNALS_H_
+
+namespace node {
+
+#ifndef offset_of
+// g++ in strict mode complains loudly about the system offsetof() macro
+// because it uses NULL as the base address.
+#define offset_of(type, member) \
+ ((intptr_t) ((char *) &(((type *) 8)->member) - 8))
+#endif
+
+#ifndef container_of
+#define container_of(ptr, type, member) \
+ ((type *) ((char *) (ptr) - offset_of(type, member)))
+#endif
+
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(a) (sizeof((a)) / sizeof((a)[0]))
+#endif
+
+//
+// isolates support
+//
+#if HAVE_ISOLATES
+
+# if _WIN32
+# define THREAD __declspec(thread)
+# else
+# define THREAD __thread
+# endif
+
+# define TLS(type, name) THREAD type* __tls_##name
+# define VAR(name) (*__tls_##name)
+# define EMPTY(name) (__tls_##name == NULL)
+# define ASSIGN(name, val) ((__tls_##name) = P(val))
+
+# define LAZY_ASSIGN(name, val) \
+ do if (!__tls_##name) ((__tls_##name) = P(val)); while (0)
+
+template <class T> inline v8::Persistent<T>* P(v8::Handle<T> v)
+{
+ return new v8::Persistent<T>(v8::Persistent<T>::New(v));
+}
+
+inline v8::Persistent<v8::String>* P(const char* symbol)
+{
+ return new v8::Persistent<v8::String>(
+ v8::Persistent<v8::String>::New(
+ v8::String::NewSymbol(symbol)));
+}
+
+#else // !HAVE_ISOLATES
+
+# define THREAD /* nothing */
+# define TLS(type, name) type name
+# define VAR(name) (name)
+# define EMPTY(name) ((name).IsEmpty())
+# define ASSIGN(name, val) ((name) = P(val))
+
+# define LAZY_ASSIGN(name, val) \
+ do if ((name).IsEmpty()) (name) = P(val); while (0)
+
+template <class T> inline v8::Persistent<T> P(v8::Handle<T> v)
+{
+ return v8::Persistent<T>(v);
+}
+
+inline v8::Persistent<v8::String> P(const char* symbol)
+{
+ return v8::Persistent<v8::String>::New(
+ v8::String::NewSymbol(symbol));
+}
+#endif // HAVE_ISOLATES
+
+} // namespace node
+
+#endif // SRC_NODE_INTERNALS_H_