mirror of https://gitee.com/bigwinds/arangodb
173 lines
6.3 KiB
C++
173 lines
6.3 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief Write-ahead log synchroniser thread
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2004-2013 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 triAGENS GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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/// @author Copyright 2011-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef TRIAGENS_WAL_SYNCHRONISER_THREAD_H
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#define TRIAGENS_WAL_SYNCHRONISER_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/Thread.h"
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#include "Wal/Logfile.h"
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#include "Wal/SyncRegion.h"
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namespace triagens {
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namespace wal {
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class LogfileManager;
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// -----------------------------------------------------------------------------
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// --SECTION-- class SynchroniserThread
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// -----------------------------------------------------------------------------
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class SynchroniserThread : public basics::Thread {
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////////////////////////////////////////////////////////////////////////////////
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/// @brief SynchroniserThread
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////////////////////////////////////////////////////////////////////////////////
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private:
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SynchroniserThread (SynchroniserThread const&);
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SynchroniserThread& operator= (SynchroniserThread const&);
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors and destructors
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// -----------------------------------------------------------------------------
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create the synchroniser thread
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////////////////////////////////////////////////////////////////////////////////
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SynchroniserThread (LogfileManager*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroy the synchroniser thread
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////////////////////////////////////////////////////////////////////////////////
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~SynchroniserThread ();
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief stops the synchroniser thread
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////////////////////////////////////////////////////////////////////////////////
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void stop ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief signal that a sync is needed
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////////////////////////////////////////////////////////////////////////////////
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void signalSync ();
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// -----------------------------------------------------------------------------
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// --SECTION-- Thread methods
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// -----------------------------------------------------------------------------
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protected:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief main loop
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////////////////////////////////////////////////////////////////////////////////
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void run ();
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// -----------------------------------------------------------------------------
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// --SECTION-- private methods
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief get a logfile descriptor (it caches the descriptor for performance)
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////////////////////////////////////////////////////////////////////////////////
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int getLogfileDescriptor (Logfile::IdType);
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// -----------------------------------------------------------------------------
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// --SECTION-- private variables
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief the logfile manager
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////////////////////////////////////////////////////////////////////////////////
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LogfileManager* _logfileManager;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief condition variable for the thread
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////////////////////////////////////////////////////////////////////////////////
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basics::ConditionVariable _condition;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief number of requests waiting
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////////////////////////////////////////////////////////////////////////////////
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uint32_t _waiting;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief stop flag
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////////////////////////////////////////////////////////////////////////////////
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volatile sig_atomic_t _stop;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief logfile descriptor cache
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////////////////////////////////////////////////////////////////////////////////
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struct {
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Logfile::IdType id;
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int fd;
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}
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_logfileCache;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief wait interval for the synchroniser thread when idle
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////////////////////////////////////////////////////////////////////////////////
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static const uint64_t Interval;
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};
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}
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}
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#endif
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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