/*
  This file is part of Raul.
  Copyright 2007-2012 David Robillard <http://drobilla.net>

  Raul 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 3 of the License, or any later version.

  Raul 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 Raul.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef RAUL_ATOMIC_PTR_HPP
#define RAUL_ATOMIC_PTR_HPP

#include <cstddef>

#ifdef RAUL_CPP0x

#include <atomic>

namespace Raul {

/** Atomic pointer.
 * \ingroup raul
 */
template<typename T>
class AtomicPtr {
public:
	inline AtomicPtr() : _val(NULL) {}

	inline AtomicPtr(const AtomicPtr& copy) : _val(copy.get()) {}

	inline T* get() const { return static_cast<T*>(_val.load()); }

	inline void operator=(T* val) { _val = val; }

	/** Set value to newval iff current value is oldval */
	inline bool compare_and_exchange(void* oldval, void* newval) {
		return _val.compare_exchange_strong(oldval, newval);
	}

private:
	std::atomic<void*> _val;
};

} // namespace Raul

#else // !RAUL_CPP0x

#include <glib.h>

namespace Raul {

/** Atomic pointer.
 * \ingroup raul
 */
template<typename T>
class AtomicPtr {
public:
	inline AtomicPtr()
		{ g_atomic_pointer_set(static_cast<volatile gpointer*>(&_val), NULL); }

	inline AtomicPtr(const AtomicPtr& copy)
		{ g_atomic_pointer_set(static_cast<volatile gpointer*>(&_val),
				static_cast<gpointer>(copy.get())); }

	inline T* get() const
		{ return static_cast<T*>(g_atomic_pointer_get(static_cast<volatile gpointer*>(&_val))); }

	inline void operator=(T* val)
		{ g_atomic_pointer_set(&_val, static_cast<gpointer>(val)); }

	/** Set value to newval iff current value is oldval */
	inline bool compare_and_exchange(gpointer oldval, gpointer newval)
		{ return g_atomic_pointer_compare_and_exchange(&_val, oldval, newval); }

private:
	mutable volatile gpointer _val;
};

} // namespace Raul

#endif // RAUL_CPP0x

#endif // RAUL_ATOMIC_PTR_HPP