mirror of https://gitee.com/bigwinds/arangodb
95 lines
3.0 KiB
C++
95 lines
3.0 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 Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_BASICS_BARRIER_H
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#define ARANGODB_BASICS_BARRIER_H 1
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#include "Basics/Common.h"
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#include "Basics/ConditionVariable.h"
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namespace arangodb {
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namespace basics {
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class Barrier {
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public:
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Barrier(Barrier const&) = delete;
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Barrier& operator=(Barrier const&) = delete;
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explicit Barrier(size_t);
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~Barrier();
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//////////////////////////////////////////////////////////////////////////////
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/// @brief join a single task. reduces the number of waiting tasks and wakes
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/// up the barrier's synchronize() routine
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//////////////////////////////////////////////////////////////////////////////
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void join();
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//////////////////////////////////////////////////////////////////////////////
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/// @brief wait for all tasks to join
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//////////////////////////////////////////////////////////////////////////////
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void synchronize();
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private:
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//////////////////////////////////////////////////////////////////////////////
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/// @brief condition variable
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//////////////////////////////////////////////////////////////////////////////
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arangodb::basics::ConditionVariable _condition;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief number of non-joined tasks
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//////////////////////////////////////////////////////////////////////////////
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size_t _missing;
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};
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class BarrierTask {
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public:
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BarrierTask() = delete;
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BarrierTask(BarrierTask const&) = delete;
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BarrierTask& operator=(BarrierTask const&) = delete;
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explicit BarrierTask(Barrier* barrier) : _barrier(barrier) {}
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//////////////////////////////////////////////////////////////////////////////
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/// @brief destructor. joins the underlying barrier
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//////////////////////////////////////////////////////////////////////////////
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~BarrierTask() { _barrier->join(); }
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private:
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//////////////////////////////////////////////////////////////////////////////
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/// @brief the underlying barrier
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//////////////////////////////////////////////////////////////////////////////
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Barrier* _barrier;
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};
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} // namespace arangodb::basics
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} // namespace arangodb
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#endif
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