gem5/sim/sim_time.hh

/*
 * Copyright (c) 2003 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __SIM_TIME_HH__
#define __SIM_TIME_HH__

#include <sys/time.h>

#include <iosfwd>

namespace Time {
    struct _timeval;
    class Start
    {
      private:
        mutable _timeval *start;

      public:
        Start();
        ~Start();

        const timeval &get() const;
        void reset();
        double operator()() const;
    };

    class Now
    {
      private:
        mutable _timeval *now;

      public:
        Now();
        ~Now();

        const timeval &get() const;
        double operator()() const;
    };

    class Elapsed
    {
      private:
        mutable _timeval *elapsed;
        Start _start;
        Now _now;

      public:
        Elapsed();
        ~Elapsed();

        const timeval &get() const;
        void reset();
        double operator()() const;
    };

    extern Start start;
    extern Now now;
    extern Elapsed elapsed;

    std::ostream &operator<<(std::ostream &out, const Start &start);
    std::ostream &operator<<(std::ostream &out, const Now &now);
    std::ostream &operator<<(std::ostream &out, const Elapsed &elapsed);
}

#endif // __SIM_TIME_HH__