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diff --git a/js/src/vm/InternalThreadPool.h b/js/src/vm/InternalThreadPool.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * An internal thread pool, used for the shell and when
+ * JS::SetHelperThreadTaskCallback not called.
+ */
+
+#ifndef vm_InternalThreadPool_h
+#define vm_InternalThreadPool_h
+
+#include "js/AllocPolicy.h"
+#include "js/UniquePtr.h"
+#include "js/Vector.h"
+#include "threading/ConditionVariable.h"
+#include "threading/ProtectedData.h"
+
+namespace JS {
+enum class DispatchReason;
+};
+
+namespace js {
+
+class AutoLockHelperThreadState;
+class HelperThread;
+
+using HelperThreadVector =
+    Vector<UniquePtr<HelperThread>, 0, SystemAllocPolicy>;
+
+class InternalThreadPool {
+ public:
+  static bool Initialize(size_t threadCount, AutoLockHelperThreadState& lock);
+  static void ShutDown(AutoLockHelperThreadState& lock);
+
+  static bool IsInitialized() { return Instance; }
+  static InternalThreadPool& Get();
+
+  bool ensureThreadCount(size_t threadCount, AutoLockHelperThreadState& lock);
+  size_t threadCount(const AutoLockHelperThreadState& lock);
+
+  size_t sizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf,
+                             const AutoLockHelperThreadState& lock) const;
+
+ private:
+  static void DispatchTask(JS::DispatchReason reason);
+
+  void dispatchTask(JS::DispatchReason reason);
+  void shutDown(AutoLockHelperThreadState& lock);
+
+  HelperThreadVector& threads(const AutoLockHelperThreadState& lock);
+  const HelperThreadVector& threads(
+      const AutoLockHelperThreadState& lock) const;
+
+  void notifyAll(const AutoLockHelperThreadState& lock);
+  void wait(AutoLockHelperThreadState& lock);
+  friend class HelperThread;
+
+  static InternalThreadPool* Instance;
+
+  HelperThreadLockData<HelperThreadVector> threads_;
+
+  js::ConditionVariable wakeup;
+
+  HelperThreadLockData<size_t> queuedTasks;
+
+  HelperThreadLockData<bool> terminating;
+};
+
+}  // namespace js
+
+#endif /* vm_InternalThreadPool_h */