mirror of https://gitee.com/bigwinds/arangodb
104 lines
2.9 KiB
C++
104 lines
2.9 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_ALLOCATOR_THREAD_H
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#define ARANGOD_MMFILES_ALLOCATOR_THREAD_H 1
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#include "Basics/Common.h"
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#include "Basics/ConditionVariable.h"
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#include "Basics/ReadLocker.h"
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#include "Basics/ReadWriteLock.h"
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#include "Basics/Thread.h"
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#include "Basics/WriteLocker.h"
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namespace arangodb {
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class MMFilesLogfileManager;
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class MMFilesAllocatorThread final : public Thread {
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MMFilesAllocatorThread(MMFilesAllocatorThread const&) = delete;
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MMFilesAllocatorThread& operator=(MMFilesAllocatorThread const&) = delete;
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public:
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explicit MMFilesAllocatorThread(MMFilesLogfileManager*);
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~MMFilesAllocatorThread() { shutdown(); }
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public:
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void beginShutdown() override final;
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public:
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/// @brief signal the creation of a new logfile
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void signal(uint32_t);
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/// @brief wait for allocator result
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int waitForResult(uint64_t);
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/// @brief tell the thread that the recovery phase is over
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void recoveryDone() {
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WRITE_LOCKER(writeLocker, _recoveryLock);
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_inRecovery = false;
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}
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/// @brief whether or not we are in recovery
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bool inRecovery() {
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READ_LOCKER(readLocker, _recoveryLock);
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return _inRecovery;
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}
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protected:
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/// @brief main loop
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void run() override;
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private:
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/// @brief creates a new reserve logfile
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int createReserveLogfile(uint32_t);
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private:
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/// @brief the logfile manager
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MMFilesLogfileManager* _logfileManager;
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/// @brief condition variable for the allocator thread
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basics::ConditionVariable _condition;
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/// @brief lock for _inRecovery
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basics::ReadWriteLock _recoveryLock;
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/// @brief requested logfile size
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uint32_t _requestedSize;
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/// @brief whether or not we are in the recovery mode
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bool _inRecovery;
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/// @brief condition variable for the allocator thread
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basics::ConditionVariable _allocatorResultCondition;
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/// @brief allocation result
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int _allocatorResult;
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/// @brief wait interval for the allocator thread when idle
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static uint64_t const Interval;
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};
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} // namespace arangodb
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#endif
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