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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