1 files changed, 74 insertions, 0 deletions
diff --git a/Source/WebCore/dom/Microtasks.h b/Source/WebCore/dom/Microtasks.h
new file mode 100644
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+++ b/Source/WebCore/dom/Microtasks.h
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+/*
+ * Copyright (C) 2014 Yoav Weiss (yoav@yoav.ws)
+ * Copyright (C) 2015 Akamai Technologies Inc. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#pragma once
+
+#include "Timer.h"
+#include <wtf/NeverDestroyed.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class MicrotaskQueue;
+
+class Microtask {
+public:
+    virtual ~Microtask()
+    {
+    }
+
+    enum class Result {
+        Done,
+        KeepInQueue
+    };
+
+    virtual Result run() = 0;
+
+protected:
+    void removeSelfFromQueue(MicrotaskQueue&);
+};
+
+class MicrotaskQueue {
+    friend NeverDestroyed<MicrotaskQueue>;
+    friend class Microtask;
+public:
+    WEBCORE_EXPORT static MicrotaskQueue& mainThreadQueue();
+
+    WEBCORE_EXPORT MicrotaskQueue();
+    WEBCORE_EXPORT ~MicrotaskQueue();
+
+    WEBCORE_EXPORT void append(std::unique_ptr<Microtask>&&);
+    WEBCORE_EXPORT void performMicrotaskCheckpoint();
+
+private:
+    WEBCORE_EXPORT void remove(const Microtask&);
+
+    void timerFired();
+
+    bool m_performingMicrotaskCheckpoint = false;
+    Vector<std::unique_ptr<Microtask>> m_microtaskQueue;
+
+    // FIXME: Instead of a Timer, we should have a centralized Event Loop that calls performMicrotaskCheckpoint()
+    // on every iteration, implementing https://html.spec.whatwg.org/multipage/webappapis.html#processing-model-9
+    Timer m_timer;
+};
+
+} // namespace WebCore