61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
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/*
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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) 2021 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 modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __KICAD_SPINLOCK_H
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#define __KICAD_SPINLOCK_H
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#include <atomic>
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/**
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* A trivial spinlock implementation with no optimization. Don't use if congestion is expected!
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*/
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class KISPINLOCK
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{
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public:
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KISPINLOCK() :
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m_lock( false )
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{}
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void lock()
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{
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while( m_lock.exchange( true, std::memory_order_acquire ) );
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}
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bool try_lock()
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{
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return !m_lock.exchange( true, std::memory_order_acquire );
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}
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void unlock()
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{
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m_lock.store( false, std::memory_order_release );
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}
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bool test()
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{
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return m_lock.load( std::memory_order_acquire );
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}
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private:
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std::atomic<bool> m_lock;
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};
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#endif
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