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diff --git a/src/3rdparty/v8/src/v8threads.h b/src/3rdparty/v8/src/v8threads.h
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+// 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_V8THREADS_H_
+#define V8_V8THREADS_H_
+
+namespace v8 {
+namespace internal {
+
+
+class ThreadState {
+ public:
+  // Returns NULL after the last one.
+  ThreadState* Next();
+
+  enum List {FREE_LIST, IN_USE_LIST};
+
+  void LinkInto(List list);
+  void Unlink();
+
+  // Id of thread.
+  void set_id(int id) { id_ = id; }
+  int id() { return id_; }
+
+  // Should the thread be terminated when it is restored?
+  bool terminate_on_restore() { return terminate_on_restore_; }
+  void set_terminate_on_restore(bool terminate_on_restore) {
+    terminate_on_restore_ = terminate_on_restore;
+  }
+
+  // Get data area for archiving a thread.
+  char* data() { return data_; }
+ private:
+  explicit ThreadState(ThreadManager* thread_manager);
+
+  void AllocateSpace();
+
+  int id_;
+  bool terminate_on_restore_;
+  char* data_;
+  ThreadState* next_;
+  ThreadState* previous_;
+
+  ThreadManager* thread_manager_;
+
+  friend class ThreadManager;
+};
+
+
+// Defined in top.h
+class ThreadLocalTop;
+
+
+class ThreadVisitor {
+ public:
+  // ThreadLocalTop may be only available during this call.
+  virtual void VisitThread(Isolate* isolate, ThreadLocalTop* top) = 0;
+
+ protected:
+  virtual ~ThreadVisitor() {}
+};
+
+
+class ThreadManager {
+ public:
+  void Lock();
+  void Unlock();
+
+  void ArchiveThread();
+  bool RestoreThread();
+  void FreeThreadResources();
+  bool IsArchived();
+
+  void Iterate(ObjectVisitor* v);
+  void IterateArchivedThreads(ThreadVisitor* v);
+  bool IsLockedByCurrentThread() { return mutex_owner_.IsSelf(); }
+
+  int CurrentId();
+
+  void TerminateExecution(int thread_id);
+
+  // Iterate over in-use states.
+  ThreadState* FirstThreadStateInUse();
+  ThreadState* GetFreeThreadState();
+
+  static const int kInvalidId = -1;
+ private:
+  ThreadManager();
+  ~ThreadManager();
+
+  void EagerlyArchiveThread();
+
+  Mutex* mutex_;
+  ThreadHandle mutex_owner_;
+  ThreadHandle lazily_archived_thread_;
+  ThreadState* lazily_archived_thread_state_;
+
+  // 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.
+  ThreadState* free_anchor_;
+  // Head of linked list of states in use.
+  ThreadState* in_use_anchor_;
+
+  Isolate* isolate_;
+
+  friend class Isolate;
+  friend class ThreadState;
+};
+
+
+// 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
+// JavaScript can take full control of V8 and not allow other threads to run.
+class ContextSwitcher: public Thread {
+ public:
+  // Set the preemption interval for the ContextSwitcher thread.
+  static void StartPreemption(int every_n_ms);
+
+  // Stop sending preemption requests to threads.
+  static void StopPreemption();
+
+  // Preempted thread needs to call back to the ContextSwitcher to acknowledge
+  // the handling of a preemption request.
+  static void PreemptionReceived();
+
+ private:
+  explicit ContextSwitcher(Isolate* isolate, int every_n_ms);
+
+  void Run();
+
+  bool keep_going_;
+  int sleep_ms_;
+};
+
+} }  // namespace v8::internal
+
+#endif  // V8_V8THREADS_H_