114 lines
3.3 KiB
C++
114 lines
3.3 KiB
C++
/*
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Copyright (c) 2011-2016, Arvid Norberg
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All rights reserved.
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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
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are met:
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* 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
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "libtorrent/config.hpp"
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#include "libtorrent/random.hpp"
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#include "libtorrent/assert.hpp"
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#ifdef BOOST_NO_CXX11_HDR_RANDOM
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#include "libtorrent/aux_/disable_warnings_push.hpp"
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#include <boost/random/random_device.hpp>
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#include <boost/random/mersenne_twister.hpp>
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#include <boost/random/uniform_int_distribution.hpp>
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#include "libtorrent/aux_/disable_warnings_pop.hpp"
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#else
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#include <random>
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#endif
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#if !TORRENT_THREADSAFE_STATIC
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#include "libtorrent/thread.hpp"
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#endif
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namespace libtorrent
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{
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#ifdef BOOST_NO_CXX11_HDR_RANDOM
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using boost::random::random_device;
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using boost::random::mt19937;
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using boost::random::uniform_int_distribution;
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#else
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using std::random_device;
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using std::mt19937;
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using std::uniform_int_distribution;
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#endif
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#ifdef TORRENT_BUILD_SIMULATOR
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boost::uint32_t random()
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{
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// make sure random numbers are deterministic. Seed with a fixed number
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static mt19937 random_engine(4040);
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return uniform_int_distribution<boost::uint32_t>(0, UINT_MAX)(random_engine);
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}
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#else
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#if !TORRENT_THREADSAFE_STATIC
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// because local statics are not atomic pre c++11
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// do it manually, probably at a higher cost
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namespace
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{
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static mutex random_device_mutex;
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static random_device* dev = NULL;
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static mt19937* rnd = NULL;
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}
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#endif
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boost::uint32_t random()
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{
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#if TORRENT_THREADSAFE_STATIC
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static random_device dev;
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static mt19937 random_engine(dev());
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return uniform_int_distribution<boost::uint32_t>(0, UINT_MAX)(random_engine);
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#else
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mutex::scoped_lock l(random_device_mutex);
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if (dev == NULL)
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{
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dev = new random_device();
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rnd = new mt19937((*dev)());
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}
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return uniform_int_distribution<boost::uint32_t>(0, UINT_MAX)(*rnd);
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#endif
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}
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#endif // TORRENT_BUILD_SIMULATOR
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boost::uint32_t randint(int i)
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{
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return random() % i;
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}
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}
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