mirror of https://gitee.com/bigwinds/arangodb
140 lines
4.4 KiB
C++
140 lines
4.4 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief Write-ahead log storage allocator 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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#include "AllocatorThread.h"
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#include "BasicsC/logging.h"
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#include "Basics/ConditionLocker.h"
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#include "Wal/LogfileManager.h"
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using namespace triagens::wal;
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors and destructors
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create the allocator thread
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////////////////////////////////////////////////////////////////////////////////
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AllocatorThread::AllocatorThread (LogfileManager* logfileManager)
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: Thread("WalAllocator"),
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_logfileManager(logfileManager),
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_condition(),
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_createLogfile(false),
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_stop(0) {
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allowAsynchronousCancelation();
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroy the allocator thread
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////////////////////////////////////////////////////////////////////////////////
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AllocatorThread::~AllocatorThread () {
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief initialises the allocator thread
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////////////////////////////////////////////////////////////////////////////////
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bool AllocatorThread::init () {
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return true;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief stops the allocator thread
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////////////////////////////////////////////////////////////////////////////////
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void AllocatorThread::stop () {
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if (_stop > 0) {
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return;
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}
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_stop = 1;
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_condition.signal();
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while (_stop != 2) {
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usleep(1000);
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief signal the creation of a new logfile
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////////////////////////////////////////////////////////////////////////////////
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void AllocatorThread::signalLogfileCreation () {
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CONDITION_LOCKER(guard, _condition);
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_createLogfile = true;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief creates a new logfile
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////////////////////////////////////////////////////////////////////////////////
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bool AllocatorThread::createLogfile () {
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int res = _logfileManager->allocateDatafile();
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return (res == TRI_ERROR_NO_ERROR);
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- Thread methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief main loop
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////////////////////////////////////////////////////////////////////////////////
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void AllocatorThread::run () {
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while (_stop == 0) {
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CONDITION_LOCKER(guard, _condition);
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if (_createLogfile) {
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if (createLogfile()) {
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_createLogfile = false;
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continue;
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}
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LOG_ERROR("unable to create new wal logfile");
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}
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guard.wait(1000000);
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}
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_stop = 2;
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}
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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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