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diff --git a/src/clock.hpp b/src/clock.hpp
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+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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 Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_CLOCK_HPP_INCLUDED__
+#define __ZMQ_CLOCK_HPP_INCLUDED__
+
+#include "stdint.hpp"
+
+namespace zmq
+{
+
+    class clock_t
+    {
+    public:
+
+        clock_t ();
+        ~clock_t ();
+
+        //  CPU's timestamp counter. Returns 0 if it's not available.
+        static uint64_t rdtsc ();
+
+        //  High precision timestamp.
+        static uint64_t now_us ();
+
+        //  Low precision timestamp. In tight loops generating it can be
+        //  10 to 100 times faster than the high precision timestamp.
+        uint64_t now_ms ();
+
+    private:
+
+        //  TSC timestamp of when last time measurement was made.
+        uint64_t last_tsc;
+
+        //  Physical time corresponding to the TSC above (in milliseconds).
+        uint64_t last_time;
+
+        clock_t (const clock_t&);
+        const clock_t &operator = (const clock_t&);
+    };
+
+}
+
+#endif