07ef1170e0
base/random.cc:
Change normal random function to Xrand48 so we have one source of
randomness for everything.
base/random.hh:
Add uniform distribution ability to random functions
dev/etherlink.cc:
dev/etherlink.hh:
Add ability to slightly perturb latency of ethernet
--HG--
extra : convert_revision : f7f856761fd525c233ae2a6d993b1fd702b488f7
98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
/*
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* Copyright (c) 2003-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <cstdlib>
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#include <cmath>
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#include "sim/param.hh"
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#include "base/random.hh"
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#include "base/trace.hh"
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using namespace std;
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class RandomContext : public ParamContext
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{
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public:
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RandomContext(const string &_iniSection)
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: ::ParamContext(_iniSection) {}
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~RandomContext() {}
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void checkParams();
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};
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RandomContext paramContext("random");
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Param<unsigned>
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seed(¶mContext, "seed", "seed to random number generator", 1);
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void
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RandomContext::checkParams()
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{
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::srand48(seed);
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}
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long
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getLong()
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{
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return mrand48();
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}
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int64_t
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getUniform(int64_t maxmin)
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{
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double r;
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r = (drand48() - 0.500) * 2 * maxmin;
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DPRINTFN("getUniform %f\n", r);
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return (int64_t)round(r);
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}
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uint64_t
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getUniformPos(uint64_t max)
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{
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double r;
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r = drand48() * 2 * max;
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return (uint64_t)round(r);
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}
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// idea for generating a double from erand48
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double
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getDouble()
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{
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union {
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uint32_t _long[2];
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uint16_t _short[4];
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};
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_long[0] = mrand48();
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_long[1] = mrand48();
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return ldexp((double) _short[0], -48) +
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ldexp((double) _short[1], -32) +
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ldexp((double) _short[2], -16);
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}
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