////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2017 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Daniel H. Larkin
////////////////////////////////////////////////////////////////////////////////

#include "Basics/SharedPRNG.h"
#include "Basics/splitmix64.h"

using namespace arangodb::basics;

std::unique_ptr<SharedPRNG> SharedPRNG::_global = std::make_unique<SharedPRNG>();

void PaddedPRNG::seed(uint64_t seed1, uint64_t seed2) {
  _prng.seed(seed1, seed2);
}

SharedPRNG::SharedPRNG() : _mask(SharedPRNG::_stripes - 1) {
  splitmix64 seeder(0xdeadbeefdeadbeefULL);
  for (size_t i = 0; i < _stripes; i++) {
    uint64_t seed1 = seeder.next();
    uint64_t seed2 = seeder.next();
    _prng[i].seed(seed1, seed2);
  }
}