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// Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
// Free Software Foundation, Inc
//
// 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 3 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 St, Fifth Floor, Boston, MA 02110-1301 USA
#ifndef GNASH_REF_COUNTED_H
#define GNASH_REF_COUNTED_H
#include "dsodefs.h" // for DSOEXPORT
#include <cassert>
#include <atomic>
namespace gnash {
/// \brief
/// For stuff that's tricky to keep track of w/r/t ownership & cleanup.
/// The only use for this class seems to be for putting derived
/// classes in smart_ptr
///
class DSOEXPORT ref_counted
{
private:
// We use an atomic counter to make ref-counting
// thread-safe. The drop_ref() method must be
// carefully designed for this to be effective
// (decrement & check in a single statement)
//
mutable std::atomic<int> m_ref_count;
protected:
// A ref-counted object only deletes self,
// must never be explicitly deleted !
virtual ~ref_counted()
{
assert(m_ref_count == 0);
}
public:
ref_counted()
:
m_ref_count(0)
{
}
ref_counted(const ref_counted&)
:
m_ref_count(0)
{
}
void add_ref() const {
assert(m_ref_count >= 0);
++m_ref_count;
}
void drop_ref() const {
assert(m_ref_count > 0);
if (!--m_ref_count) {
// Delete me!
delete this;
}
}
long get_ref_count() const { return m_ref_count; }
};
inline void
intrusive_ptr_add_ref(const ref_counted* o)
{
o->add_ref();
}
inline void
intrusive_ptr_release(const ref_counted* o)
{
o->drop_ref();
}
} // namespace gnash
#endif // GNASH_REF_COUNTED_H
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