mirror of https://gitee.com/bigwinds/arangodb
59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 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 Max Neunhoeffer
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////////////////////////////////////////////////////////////////////////////////
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#include "Basics/DataProtector.h"
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// TODO: Make this a template again once everybody has gcc >= 4.9.2
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// template<int Nr>
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// thread_local int arangodb::basics::DataProtector<Nr>::_mySlot = -1;
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thread_local int arangodb::basics::DataProtector::_mySlot = -1;
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// TODO: Make this a template again once everybody has gcc >= 4.9.2
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// template<int Nr>
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// std::atomic<int> arangodb::basics::DataProtector<Nr>::_last(0);
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std::atomic<int> arangodb::basics::DataProtector::_last(0);
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/// We need an explicit template initialization for each value of the
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/// template parameter, such that the compiler can allocate a thread local
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/// variable for each of them.
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// TODO: Reactivate this template instantiation once everybody has gcc >= 4.9.2
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// template class arangodb::basics::DataProtector<64>;
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int arangodb::basics::DataProtector::getMyId() {
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int id = _mySlot;
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if (id >= 0) {
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return id;
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}
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while (true) {
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int newId = _last + 1;
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if (newId >= DATA_PROTECTOR_MULTIPLICITY) {
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newId = 0;
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}
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if (_last.compare_exchange_strong(id, newId)) {
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_mySlot = newId;
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return newId;
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}
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}
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}
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