mirror of https://gitee.com/bigwinds/arangodb
77 lines
2.3 KiB
C++
77 lines
2.3 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 ARANGOD_MMFILES_MMFILES_COLLECTION_READ_LOCKER_H
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#define ARANGOD_MMFILES_MMFILES_COLLECTION_READ_LOCKER_H 1
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#include "Basics/Common.h"
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#include "Basics/Exceptions.h"
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#include "MMFiles/MMFilesCollection.h"
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namespace arangodb {
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class MMFilesCollectionReadLocker {
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public:
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MMFilesCollectionReadLocker(MMFilesCollectionReadLocker const&) = delete;
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MMFilesCollectionReadLocker& operator=(MMFilesCollectionReadLocker const&) = delete;
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/// @brief create the locker
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MMFilesCollectionReadLocker(MMFilesCollection* collection,
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bool useDeadlockDetector, bool doLock)
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: _collection(collection), _useDeadlockDetector(useDeadlockDetector), _doLock(false) {
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if (doLock) {
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int res = _collection->lockRead(_useDeadlockDetector);
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if (res != TRI_ERROR_NO_ERROR) {
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THROW_ARANGO_EXCEPTION(res);
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}
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_doLock = true;
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}
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}
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/// @brief destroy the locker
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~MMFilesCollectionReadLocker() { unlock(); }
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/// @brief release the lock
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inline void unlock() {
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if (_doLock) {
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_collection->unlockRead(_useDeadlockDetector);
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_doLock = false;
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}
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}
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private:
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/// @brief collection pointer
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MMFilesCollection* _collection;
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/// @brief whether or not to use the deadlock detector
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bool const _useDeadlockDetector;
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/// @brief lock flag
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bool _doLock;
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};
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} // namespace arangodb
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#endif
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