1 files changed, 55 insertions, 0 deletions
diff --git a/js/xpconnect/src/XPCJSThreadPool.h b/js/xpconnect/src/XPCJSThreadPool.h
new file mode 100644
index 0000000000..114e6d04c8
--- /dev/null
+++ b/js/xpconnect/src/XPCJSThreadPool.h
@@ -0,0 +1,55 @@
+/* -*- 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/. */
+
+#ifndef mozilla_JSThreadPool_h
+#define mozilla_JSThreadPool_h
+
+#include "mozilla/Unused.h"
+#include "nsIThreadPool.h"
+#include "js/Utility.h"
+#include "js/UniquePtr.h"
+
+namespace mozilla {
+/*
+ * Since XPCOM thread pools dispatch nsIRunnable*, we want a way to take the
+ * specific job that JS wants to dispatch offthread, and run it via an
+ * nsIRunnable(). RunnableTasks should self-destroy.
+ */
+class HelperThreadTaskHandler : public Runnable {
+ public:
+  NS_IMETHOD Run() override {
+    mOffThreadTask->runTask();
+    mOffThreadTask.reset();
+    return NS_OK;
+  }
+  explicit HelperThreadTaskHandler(js::UniquePtr<RunnableTask> task)
+      : Runnable("HelperThreadTaskHandler"), mOffThreadTask(std::move(task)) {}
+
+ private:
+  ~HelperThreadTaskHandler() = default;
+  js::UniquePtr<RunnableTask> mOffThreadTask;
+};
+
+/*
+ * HelperThreadPool is a thread pool infrastructure for JS offthread tasks. It
+ * holds the actual instance of a thread pool that we instantiate. The intention
+ * is to have a way to manage some of the things GlobalHelperThreadState does
+ * independently of nsThreadPool.
+ */
+class HelperThreadPool {
+ public:
+  nsresult Dispatch(already_AddRefed<HelperThreadTaskHandler> aRunnable);
+  void Shutdown();
+  HelperThreadPool();
+  virtual ~HelperThreadPool() = default;
+
+ private:
+  RefPtr<nsIThreadPool> mPool;
+};
+
+}  // namespace mozilla
+
+#endif