/*
Copyright (C) 2012-2015 Jaroslav Hajek
This file is part of Octave.
Octave 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.
Octave 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 Octave; see the file COPYING. If not, see
.
*/
#if !defined (octave_oct_refcount_h)
#define octave_oct_refcount_h 1
#ifndef OCTAVE_CONFIG_INCLUDED
# error "The file must be included before oct-refcount.h."
#endif
#if defined (USE_ATOMIC_REFCOUNT) && (defined (_MSC_VER) || defined (__GNUC__))
# if defined (_MSC_VER)
# include
# define OCTREFCOUNT_ATOMIC_INCREMENT(x) _InterlockedIncrement((long*)x)
# define OCTREFCOUNT_ATOMIC_DECREMENT(x) _InterlockedDecrement((long*)x)
# define OCTREFCOUNT_ATOMIC_INCREMENT_POST(x) _InterlockedExchangeAdd((long*)x, 1)
# define OCTREFCOUNT_ATOMIC_DECREMENT_POST(x) _InterlockedExchangeAdd((long*)x, -1)
# elif defined (__GNUC__)
# define OCTREFCOUNT_ATOMIC_INCREMENT(x) __sync_add_and_fetch(x, 1)
# define OCTREFCOUNT_ATOMIC_DECREMENT(x) __sync_add_and_fetch(x, -1)
# define OCTREFCOUNT_ATOMIC_INCREMENT_POST(x) __sync_fetch_and_add(x, 1)
# define OCTREFCOUNT_ATOMIC_DECREMENT_POST(x) __sync_fetch_and_add(x, -1)
# endif
#else // Generic non-locking versions
# define OCTREFCOUNT_ATOMIC_INCREMENT(x) ++(*(x))
# define OCTREFCOUNT_ATOMIC_DECREMENT(x) --(*(x))
# define OCTREFCOUNT_ATOMIC_INCREMENT_POST(x) (*(x))++
# define OCTREFCOUNT_ATOMIC_DECREMENT_POST(x) (*(x))--
#endif
// Encapsulates a reference counter.
template
class octave_refcount
{
public:
typedef T count_type;
octave_refcount(count_type initial_count) : count(initial_count) { }
// Increment/Decrement. int is postfix.
count_type operator++(void)
{
return OCTREFCOUNT_ATOMIC_INCREMENT (&count);
}
count_type operator++(int)
{
return OCTREFCOUNT_ATOMIC_INCREMENT_POST (&count);
}
count_type operator--(void)
{
return OCTREFCOUNT_ATOMIC_DECREMENT (&count);
}
count_type operator--(int)
{
return OCTREFCOUNT_ATOMIC_DECREMENT_POST (&count);
}
operator count_type (void) const
{
return static_cast (count);
}
count_type *get (void)
{
return &count;
}
private:
count_type count;
};
#endif