Mercurial > jwe > octave
view liboctave/util/oct-refcount.h @ 23219:3ac9f9ecfae5 stable
maint: Update copyright dates.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 22 Feb 2017 12:39:29 -0500 |
parents | e9a0469dedd9 |
children | 092078913d54 |
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/* Copyright (C) 2012-2017 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 <http://www.gnu.org/licenses/>. */ #if ! defined (octave_oct_refcount_h) #define octave_oct_refcount_h 1 #include "octave-config.h" #include "octave-config.h" #if (defined (OCTAVE_ENABLE_ATOMIC_REFCOUNT) \ && (defined (__GNUC__) || defined (_MSC_VER))) # if defined (__GNUC__) # define OCTAVE_ATOMIC_INCREMENT(x) __sync_add_and_fetch (x, 1) # define OCTAVE_ATOMIC_DECREMENT(x) __sync_add_and_fetch (x, -1) # define OCTAVE_ATOMIC_POST_INCREMENT(x) __sync_fetch_and_add (x, 1) # define OCTAVE_ATOMIC_POST_DECREMENT(x) __sync_fetch_and_add (x, -1) # elif defined (_MSC_VER) # include <intrin.h> # define OCTAVE_ATOMIC_INCREMENT(x) \ _InterlockedIncrement (static_cast<long *> (x)) # define OCTAVE_ATOMIC_DECREMENT(x) \ _InterlockedDecrement (static_cast<long *> (x)) # define OCTAVE_ATOMIC_POST_INCREMENT(x) \ _InterlockedExchangeAdd (static_cast<long *> (x)) # define OCTAVE_ATOMIC_POST_DECREMENT(x) \ _InterlockedExchangeAdd (static_cast<long *> (x)) # endif #else // Generic non-locking versions # define OCTAVE_ATOMIC_INCREMENT(x) ++(*(x)) # define OCTAVE_ATOMIC_DECREMENT(x) --(*(x)) # define OCTAVE_ATOMIC_POST_INCREMENT(x) (*(x))++ # define OCTAVE_ATOMIC_POST_DECREMENT(x) (*(x))-- #endif // Encapsulates a reference counter. template <typename T> 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 OCTAVE_ATOMIC_INCREMENT (&count); } count_type operator++ (int) { return OCTAVE_ATOMIC_POST_INCREMENT (&count); } count_type operator-- (void) { return OCTAVE_ATOMIC_DECREMENT (&count); } count_type operator-- (int) { return OCTAVE_ATOMIC_POST_DECREMENT (&count); } operator count_type (void) const { return static_cast<count_type const volatile&> (count); } count_type *get (void) { return &count; } private: count_type count; }; #endif