1 files changed, 57 insertions, 0 deletions
diff --git a/src/javascript/jsc/bindings/webcore/Microtasks.h b/src/javascript/jsc/bindings/webcore/Microtasks.h
new file mode 100644
index 000000000..be173b0e8
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+++ b/src/javascript/jsc/bindings/webcore/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 <wtf/Forward.h>
+#include <wtf/Vector.h>
+
+namespace JSC {
+class VM;
+} // namespace JSC
+
+namespace WebCore {
+
+class EventLoopTask;
+
+class MicrotaskQueue final {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    WEBCORE_EXPORT MicrotaskQueue(JSC::VM&);
+    WEBCORE_EXPORT ~MicrotaskQueue();
+
+    WEBCORE_EXPORT void append(std::unique_ptr<EventLoopTask>&&);
+    WEBCORE_EXPORT void performMicrotaskCheckpoint();
+
+    WEBCORE_EXPORT void addCheckpointTask(std::unique_ptr<EventLoopTask>&&);
+
+private:
+    JSC::VM& vm() const { return m_vm.get(); }
+
+    bool m_performingMicrotaskCheckpoint { false };
+    Vector<std::unique_ptr<EventLoopTask>> m_microtaskQueue;
+    // For the main thread the VM lives forever. For workers it's lifetime is tied to our owning WorkerGlobalScope. Regardless, we retain the VM here to be safe.
+    Ref<JSC::VM> m_vm;
+
+    Vector<std::unique_ptr<EventLoopTask>> m_checkpointTasks;
+};
+
+} // namespace WebCore