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annotate liboctave/oct-refcount.h @ 14193:72aebe619641 stable rc-3-6-0-0

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3.6.0-rc0 release candidate * configure.ac (AC_INIT): Version is now 3.6.0-rc0. (OCTAVE_RELEASE_DATE): Now 2012-01-10. (OCTAVE_API_VERSION_NUMBER): Now 47.
author John W. Eaton <jwe@octave.org>
date Tue, 10 Jan 2012 16:43:41 -0500
parents 72c96de7a403
children 4c9fd3e31436
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1 /*
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2
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3 Copyright (C) 2012 Jaroslav Hajek
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if !defined (octave_refcount_h)
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24 #define octave_refcount_h 1
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25
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26 #ifndef OCTAVE_CONFIG_INCLUDED
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27 # error "The file <octave/config.h> must be included before oct-refcount.h."
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28 #endif
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29
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30 #if defined (USE_ATOMIC_REFCOUNT) && (defined (_MSC_VER) || defined (__GNUC__))
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31 # if defined (_MSC_VER)
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32 # include <intrin.h>
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33 # define OCTREFCOUNT_ATOMIC_INCREMENT(x) _InterlockedIncrement((long*)x)
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34 # define OCTREFCOUNT_ATOMIC_DECREMENT(x) _InterlockedDecrement((long*)x)
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35 # define OCTREFCOUNT_ATOMIC_INCREMENT_POST(x) _InterlockedExchangeAdd((long*)x, 1)
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36 # define OCTREFCOUNT_ATOMIC_DECREMENT_POST(x) _InterlockedExchangeAdd((long*)x, -1)
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37 # elif defined (__GNUC__)
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38 # define OCTREFCOUNT_ATOMIC_INCREMENT(x) __sync_add_and_fetch(x, 1)
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39 # define OCTREFCOUNT_ATOMIC_DECREMENT(x) __sync_add_and_fetch(x, -1)
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40 # define OCTREFCOUNT_ATOMIC_INCREMENT_POST(x) __sync_fetch_and_add(x, 1)
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41 # define OCTREFCOUNT_ATOMIC_DECREMENT_POST(x) __sync_fetch_and_add(x, -1)
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42 # endif
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43 #else // Generic non-locking versions
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44 # define OCTREFCOUNT_ATOMIC_INCREMENT(x) ++(*(x))
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45 # define OCTREFCOUNT_ATOMIC_DECREMENT(x) --(*(x))
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46 # define OCTREFCOUNT_ATOMIC_INCREMENT_POST(x) (*(x))++
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47 # define OCTREFCOUNT_ATOMIC_DECREMENT_POST(x) (*(x))--
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48 #endif
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49
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50 // Encapsulates a reference counter.
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51 template <class T>
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52 class octave_refcount
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53 {
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54 public:
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55 typedef T count_type;
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56
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57 octave_refcount(count_type initial_count) : count(initial_count) {}
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58
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59 // Increment/Decrement. int is postfix.
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60 count_type operator++(void)
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61 {
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62 return OCTREFCOUNT_ATOMIC_INCREMENT (&count);
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63 }
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64
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65 count_type operator++(int)
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66 {
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67 return OCTREFCOUNT_ATOMIC_INCREMENT_POST (&count);
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68 }
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69
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70 count_type operator--(void)
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71 {
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72 return OCTREFCOUNT_ATOMIC_DECREMENT (&count);
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73 }
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74
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75 count_type operator--(int)
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76 {
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77 return OCTREFCOUNT_ATOMIC_DECREMENT_POST (&count);
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78 }
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79
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80 operator count_type (void) const
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81 {
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82 return static_cast<count_type const volatile&> (count);
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83 }
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84
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85 private:
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86 count_type count;
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87 };
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88
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89 #endif