mirror of https://gitee.com/bigwinds/arangodb
74 lines
2.4 KiB
C++
74 lines
2.4 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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#include "Barrier.h"
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#include "Basics/ConditionLocker.h"
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using namespace arangodb::basics;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create a barrier for the specified number of waiters
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////////////////////////////////////////////////////////////////////////////////
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Barrier::Barrier(size_t size) : _condition(), _missing(size) {
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TRI_ASSERT(size > 0);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroy the barrier. this will call synchronize() to ensure all tasks
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/// are joined
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////////////////////////////////////////////////////////////////////////////////
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Barrier::~Barrier() { synchronize(); }
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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 Barrier::join() {
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{
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CONDITION_LOCKER(guard, _condition);
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TRI_ASSERT(_missing > 0);
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--_missing;
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}
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_condition.signal();
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief wait for all tasks to join
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////////////////////////////////////////////////////////////////////////////////
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void Barrier::synchronize() {
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while (true) {
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CONDITION_LOCKER(guard, _condition);
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if (_missing == 0) {
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break;
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}
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guard.wait(100000);
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}
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}
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