NS-3 based Named Data Networking (NDN) simulator
ndnSIM 2.5: NDN, CCN, CCNx, content centric networks
API Documentation
random.cpp
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2014-2019, Regents of the University of California,
4  * Arizona Board of Regents,
5  * Colorado State University,
6  * University Pierre & Marie Curie, Sorbonne University,
7  * Washington University in St. Louis,
8  * Beijing Institute of Technology,
9  * The University of Memphis.
10  *
11  * This file is part of NFD (Named Data Networking Forwarding Daemon).
12  * See AUTHORS.md for complete list of NFD authors and contributors.
13  *
14  * NFD is free software: you can redistribute it and/or modify it under the terms
15  * of the GNU General Public License as published by the Free Software Foundation,
16  * either version 3 of the License, or (at your option) any later version.
17  *
18  * NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
19  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
20  * PURPOSE. See the GNU General Public License for more details.
21  *
22  * You should have received a copy of the GNU General Public License along with
23  * NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
24  */
25 
26 #include "random.hpp"
27 #include <boost/thread/tss.hpp>
28 
29 namespace nfd {
30 
31 std::mt19937&
33 {
34  static boost::thread_specific_ptr<std::mt19937> rng;
35  if (rng.get() == nullptr) {
36  std::random_device rd;
37  // seed with 256 bits of entropy
38  std::seed_seq seeds{rd(), rd(), rd(), rd(), rd(), rd(), rd(), rd()};
39  rng.reset(new std::mt19937(seeds));
40  }
41  return *rng;
42 }
43 
44 } // namespace nfd
Declares the global pseudorandom number generator (PRNG) for NFD.
Copyright (c) 2011-2015 Regents of the University of California.
Definition: ndn-common.hpp:40
std::mt19937 & getGlobalRng()
Definition: random.cpp:32