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diff --git a/src/gallium/frontends/clover/core/timestamp.hpp b/src/gallium/frontends/clover/core/timestamp.hpp
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+++ b/src/gallium/frontends/clover/core/timestamp.hpp
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+//
+// Copyright 2013 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 OR COPYRIGHT HOLDERS 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 CLOVER_CORE_TIMESTAMP_HPP
+#define CLOVER_CORE_TIMESTAMP_HPP
+
+#include "core/object.hpp"
+
+struct pipe_query;
+
+namespace clover {
+   class command_queue;
+
+   namespace timestamp {
+      ///
+      /// Emit a timestamp query that is executed asynchronously by
+      /// the command queue \a q.
+      ///
+      class query {
+      public:
+         query(command_queue &q);
+         query(query &&other);
+         ~query();
+
+         query &operator=(const query &) = delete;
+
+         ///
+         /// Retrieve the query results.
+         ///
+         cl_ulong operator()() const;
+
+      private:
+         const intrusive_ref<command_queue> q;
+         pipe_query *_query;
+      };
+
+      ///
+      /// Get the current timestamp value.
+      ///
+      class current {
+      public:
+         current(command_queue &q);
+
+         ///
+         /// Retrieve the query results.
+         ///
+         cl_ulong operator()() const;
+
+      private:
+         cl_ulong result;
+      };
+   }
+}
+
+#endif