82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2016 Mario Luzeiro <mrluzeiro@ua.pt>
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* Copyright (C) 1992-2016 KiCad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/**
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* @file openmp_mutex.h
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* @brief a mutex for openmp got from the website:
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* http://bisqwit.iki.fi/story/howto/openmp/
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* by Joel Yliluoma <bisqwit@iki.fi>
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*/
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#ifndef _OPENMP_MUTEX_H
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#define _OPENMP_MUTEX_H
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#ifdef _OPENMP
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# include <omp.h>
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struct MutexType
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{
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MutexType() { omp_init_lock( &lock ); }
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~MutexType() { omp_destroy_lock( &lock ); }
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void Lock() { omp_set_lock( &lock ); }
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void Unlock() { omp_unset_lock( &lock ); }
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MutexType( const MutexType& ) { omp_init_lock( &lock ); }
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MutexType& operator= ( const MutexType& ) { return *this; }
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public:
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omp_lock_t lock;
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};
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#else
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/// A dummy mutex that doesn't actually exclude anything,
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/// but as there is no parallelism either, no worries.
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struct MutexType
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{
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void Lock() {}
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void Unlock() {}
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};
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#endif
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/// An exception-safe scoped lock-keeper.
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struct ScopedLock
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{
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explicit ScopedLock( MutexType& m ) : mut( m ), locked( true ) { mut.Lock(); }
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~ScopedLock() { Unlock(); }
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void Unlock() { if( !locked ) return; locked = false; mut.Unlock(); }
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void LockAgain() { if( locked ) return; mut.Lock(); locked = true; }
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private:
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MutexType& mut;
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bool locked;
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private: // prevent copying the scoped lock.
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void operator=(const ScopedLock&);
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ScopedLock(const ScopedLock&);
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};
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#endif // _OPENMP_MUTEX_H
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