random.cc

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/*
 * Copyright (c) 2014 ARM Limited
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 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
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 *
 * Copyright (c) 2003-2005 The Regents of The University of Michigan
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 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
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 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * Authors: Nathan Binkert
 *          Ali Saidi
 *          Andreas Hansson
 */

#include "base/random.hh"

#include <sstream>

#include "base/misc.hh"
#include "sim/serialize.hh"

Random::Random()
{
    // default random seed
    init(5489);
}

Random::Random(uint32_t s)
{
    init(s);
}

Random::~Random()
{
}

void
Random::init(uint32_t s)
{
    gen.seed(s);
}

void
Random::serialize(CheckpointOut &cp) const
{
    panic("Currently not used anywhere.\n");

    // get the state from the generator
    std::ostringstream oss;
    oss << gen;
    std::string state = oss.str();
    paramOut(cp, "mt_state", state);
}

void
Random::unserialize(CheckpointIn &cp)
{
    panic("Currently not used anywhere.\n");

    // the random generator state did not use to be part of the
    // checkpoint state, so be forgiving in the unserialization and
    // keep on going if the parameter is not there
    std::string state;
    if (optParamIn(cp, "mt_state", state)) {
        std::istringstream iss(state);
        iss >> gen;
    }
}

Random random_mt;