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diff --git a/src/gallium/state_trackers/clover/core/queue.hpp b/src/gallium/state_trackers/clover/core/queue.hpp
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+++ b/src/gallium/state_trackers/clover/core/queue.hpp
@@ -0,0 +1,71 @@
+//
+// Copyright 2012 Francisco Jerez
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+// THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+// OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+
+#ifndef __CORE_QUEUE_HPP__
+#define __CORE_QUEUE_HPP__
+
+#include "core/base.hpp"
+#include "core/context.hpp"
+#include "pipe/p_context.h"
+
+namespace clover {
+   typedef struct _cl_command_queue command_queue;
+   class resource;
+   class mapping;
+   class hard_event;
+}
+
+struct _cl_command_queue : public clover::ref_counter {
+public:
+   _cl_command_queue(clover::context &ctx, clover::device &dev,
+                     cl_command_queue_properties props);
+   _cl_command_queue(const _cl_command_queue &q) = delete;
+   ~_cl_command_queue();
+
+   void flush();
+
+   cl_command_queue_properties props() const {
+      return __props;
+   }
+
+   clover::context &ctx;
+   clover::device &dev;
+
+   friend class clover::resource;
+   friend class clover::mapping;
+   friend class clover::hard_event;
+   friend struct _cl_sampler;
+   friend struct _cl_kernel;
+
+private:
+   /// Serialize a hardware event with respect to the previous ones,
+   /// and push it to the pending list.
+   void sequence(clover::hard_event *ev);
+
+   cl_command_queue_properties __props;
+   pipe_context *pipe;
+
+   typedef clover::ref_ptr<clover::hard_event> event_ptr;
+   std::vector<event_ptr> queued_events;
+};
+
+#endif