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81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
/*
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Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
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This file is part of libzmq, the ZeroMQ core engine in C++.
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libzmq is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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As a special exception, the Contributors give you permission to link
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this library with independent modules to produce an executable,
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regardless of the license terms of these independent modules, and to
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copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the
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terms and conditions of the license of that module. An independent
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module is a module which is not derived from or based on this library.
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If you modify this library, you must extend this exception to your
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version of the library.
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libzmq is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ZMQ_CLOCK_HPP_INCLUDED__
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#define __ZMQ_CLOCK_HPP_INCLUDED__
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#include "macros.hpp"
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#include "stdint.hpp"
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#if defined ZMQ_HAVE_OSX
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// TODO this is not required in this file, but condition_variable.hpp includes
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// clock.hpp to get these definitions
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#ifndef CLOCK_REALTIME
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#define CLOCK_REALTIME 0
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#endif
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#ifndef HAVE_CLOCK_GETTIME
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#define HAVE_CLOCK_GETTIME
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#endif
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#include <mach/clock.h>
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#include <mach/mach.h>
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#include <time.h>
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#include <sys/time.h>
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#endif
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namespace zmq
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{
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class clock_t
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{
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public:
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clock_t ();
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// CPU's timestamp counter. Returns 0 if it's not available.
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static uint64_t rdtsc ();
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// High precision timestamp.
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static uint64_t now_us ();
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// Low precision timestamp. In tight loops generating it can be
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// 10 to 100 times faster than the high precision timestamp.
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uint64_t now_ms ();
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private:
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// TSC timestamp of when last time measurement was made.
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uint64_t _last_tsc;
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// Physical time corresponding to the TSC above (in milliseconds).
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uint64_t _last_time;
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ZMQ_NON_COPYABLE_NOR_MOVABLE (clock_t)
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};
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}
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#endif
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