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88 lines
1.8 KiB
88 lines
1.8 KiB
9 years ago
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/****************************************************************************
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*
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* (c) 2009-2016 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
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*
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* QGroundControl is licensed according to the terms in the file
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* COPYING.md in the root of the source code directory.
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*
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****************************************************************************/
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#include "RunGuard.h"
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#include <QCryptographicHash>
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namespace
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{
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QString generateKeyHash( const QString& key, const QString& salt )
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{
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QByteArray data;
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data.append( key.toUtf8() );
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data.append( salt.toUtf8() );
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data = QCryptographicHash::hash( data, QCryptographicHash::Sha1 ).toHex();
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return data;
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}
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}
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RunGuard::RunGuard( const QString& key )
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: key( key )
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, memLockKey( generateKeyHash( key, "_memLockKey" ) )
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, sharedmemKey( generateKeyHash( key, "_sharedmemKey" ) )
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, sharedMem( sharedmemKey )
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, memLock( memLockKey, 1 )
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{
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memLock.acquire();
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{
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QSharedMemory fix( sharedmemKey ); // Fix for *nix: http://habrahabr.ru/post/173281/
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fix.attach();
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}
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memLock.release();
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}
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RunGuard::~RunGuard()
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{
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release();
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}
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bool RunGuard::isAnotherRunning()
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{
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if ( sharedMem.isAttached() )
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return false;
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memLock.acquire();
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const bool isRunning = sharedMem.attach();
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if ( isRunning )
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sharedMem.detach();
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memLock.release();
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return isRunning;
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}
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bool RunGuard::tryToRun()
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{
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if ( isAnotherRunning() ) // Extra check
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return false;
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memLock.acquire();
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const bool result = sharedMem.create( sizeof( quint64 ) );
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memLock.release();
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if ( !result )
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{
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release();
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return false;
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}
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return true;
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}
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void RunGuard::release()
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{
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memLock.acquire();
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if ( sharedMem.isAttached() )
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sharedMem.detach();
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memLock.release();
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}
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