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added a thread-safe and cross-plateform random number generator

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git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@3373 b45a01b8-16f6-495d-af2f-9b41ad6348cc
This commit is contained in:
csoler 2010-08-15 20:20:51 +00:00
parent f0da158dbe
commit 30e4509043
5 changed files with 302 additions and 3 deletions
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60
libretroshare/src/util/rsrandom.h Normal file
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/****************************************************************
* RetroShare is distributed under the following license:
*
* Copyright (C) 2010 Cyril Soler <csoler@users.sourceforge.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
****************************************************************/
#pragma once
// RSRandom contains a random number generator that is
// - thread safe
// - system independant
// - fast
// - cryptographically safe
//
// The implementation is adapted from the Mersenne Twister page of Wikipedia.
//
// http://en.wikipedia.org/wiki/Mersenne_twister
#include <vector>
#include <util/rsthreads.h>
class RSRandom
{
public:
static uint32_t random_u32() ;
static uint64_t random_u64() ;
static float random_f32() ;
static double random_f64() ;
static bool seed(uint32_t s) ;
private:
static RsMutex rndMtx ;
static const uint32_t N = 624;
static const uint32_t M = 397;
static const uint32_t MATRIX_A = 0x9908b0dfUL;
static const uint32_t UMASK = 0x80000000UL;
static const uint32_t LMASK = 0x7fffffffUL;
static void locked_next_state() ;
static uint32_t index ;
static std::vector<uint32_t> MT ;
};