mirror of https://gitee.com/bigwinds/arangodb
43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2017 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Daniel H. Larkin
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////////////////////////////////////////////////////////////////////////////////
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#include "Basics/SharedPRNG.h"
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#include "Basics/splitmix64.h"
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using namespace arangodb::basics;
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std::unique_ptr<SharedPRNG> SharedPRNG::_global = std::make_unique<SharedPRNG>();
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void PaddedPRNG::seed(uint64_t seed1, uint64_t seed2) {
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_prng.seed(seed1, seed2);
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}
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SharedPRNG::SharedPRNG() : _mask(SharedPRNG::_stripes - 1) {
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splitmix64 seeder(0xdeadbeefdeadbeefULL);
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for (size_t i = 0; i < _stripes; i++) {
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uint64_t seed1 = seeder.next();
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uint64_t seed2 = seeder.next();
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_prng[i].seed(seed1, seed2);
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}
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}
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