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/*
* Copyright (C) 2017 Robin Gareus <robin@gareus.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef _pbd_spinlock_h_
#define _pbd_spinlock_h_
#include <boost/smart_ptr/detail/spinlock.hpp>
#include <cstring>
#include "pbd/libpbd_visibility.h"
namespace PBD {
/* struct boost::detail::spinlock {
* void lock();
* bool try_lock();
* void unlock();
* };
*
* initialize with BOOST_DETAIL_SPINLOCK_INIT
*/
struct spinlock_t {
public:
#ifdef BOOST_SMART_PTR_DETAIL_SPINLOCK_STD_ATOMIC_HPP_INCLUDED
/* C++11 non-static data member initialization,
* with non-copyable std::atomic ATOMIC_FLAG_INIT
*/
spinlock_t () : l {BOOST_DETAIL_SPINLOCK_INIT} {};
#else
/* default C++ assign struct's first member */
spinlock_t ()
{
boost::detail::spinlock init = BOOST_DETAIL_SPINLOCK_INIT;
std::memcpy (&l, &init, sizeof (init));
}
#endif
void lock () { l.lock (); }
void unlock () { l.unlock (); }
bool try_lock () { return l.try_lock (); }
private:
boost::detail::spinlock l;
/* prevent copy construction */
spinlock_t (const spinlock_t&);
};
/* RAII wrapper */
class LIBPBD_API SpinLock {
public:
SpinLock (spinlock_t&);
~SpinLock ();
private:
spinlock_t& _lock;
};
} /* namespace */
#endif /* _pbd_spinlock_h__ */
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