82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
/*
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* Copyright (C) 2017-2019 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 along
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* with this program; if not, 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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#ifndef _pbd_spinlock_h_
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#define _pbd_spinlock_h_
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#include <boost/smart_ptr/detail/spinlock.hpp>
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#include <cstring>
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#include "pbd/libpbd_visibility.h"
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namespace PBD {
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/* struct boost::detail::spinlock {
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* void lock();
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* bool try_lock();
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* void unlock();
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* };
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*
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* initialize with BOOST_DETAIL_SPINLOCK_INIT
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*/
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struct spinlock_t {
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public:
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#ifdef BOOST_SMART_PTR_DETAIL_SPINLOCK_STD_ATOMIC_HPP_INCLUDED
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/* C++11 non-static data member initialization,
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* with non-copyable std::atomic ATOMIC_FLAG_INIT
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*/
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spinlock_t () {}
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#else
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/* default C++ assign struct's first member */
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spinlock_t ()
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{
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boost::detail::spinlock init = BOOST_DETAIL_SPINLOCK_INIT;
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std::memcpy (&l, &init, sizeof (init));
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}
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#endif
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void lock () { l.lock (); }
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void unlock () { l.unlock (); }
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bool try_lock () { return l.try_lock (); }
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private:
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#ifdef BOOST_SMART_PTR_DETAIL_SPINLOCK_STD_ATOMIC_HPP_INCLUDED
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boost::detail::spinlock l = BOOST_DETAIL_SPINLOCK_INIT;
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#else
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boost::detail::spinlock l;
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#endif
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/* prevent copy construction */
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spinlock_t (const spinlock_t&);
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};
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/* RAII wrapper */
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class LIBPBD_API SpinLock {
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public:
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SpinLock (spinlock_t&);
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~SpinLock ();
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private:
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spinlock_t& _lock;
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};
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} /* namespace */
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#endif /* _pbd_spinlock_h__ */
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