1 | #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SOLARIS_HPP_INCLUDED |
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2 | #define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SOLARIS_HPP_INCLUDED |
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3 | |
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4 | // |
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5 | // detail/sp_counted_base_solaris.hpp |
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6 | // based on: detail/sp_counted_base_w32.hpp |
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7 | // |
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8 | // Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd. |
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9 | // Copyright 2004-2005 Peter Dimov |
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10 | // Copyright 2006 Michael van der Westhuizen |
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11 | // |
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12 | // Distributed under the Boost Software License, Version 1.0. (See |
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13 | // accompanying file LICENSE_1_0.txt or copy at |
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14 | // http://www.boost.org/LICENSE_1_0.txt) |
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15 | // |
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16 | // |
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17 | // Lock-free algorithm by Alexander Terekhov |
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18 | // |
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19 | // Thanks to Ben Hitchings for the #weak + (#shared != 0) |
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20 | // formulation |
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21 | // |
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22 | |
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23 | #include <boost/detail/sp_typeinfo.hpp> |
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24 | #include <atomic.h> |
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25 | |
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26 | namespace boost |
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27 | { |
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28 | |
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29 | namespace detail |
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30 | { |
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31 | |
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32 | class sp_counted_base |
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33 | { |
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34 | private: |
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35 | |
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36 | sp_counted_base( sp_counted_base const & ); |
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37 | sp_counted_base & operator= ( sp_counted_base const & ); |
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38 | |
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39 | uint32_t use_count_; // #shared |
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40 | uint32_t weak_count_; // #weak + (#shared != 0) |
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41 | |
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42 | public: |
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43 | |
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44 | sp_counted_base(): use_count_( 1 ), weak_count_( 1 ) |
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45 | { |
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46 | } |
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47 | |
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48 | virtual ~sp_counted_base() // nothrow |
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49 | { |
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50 | } |
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51 | |
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52 | // dispose() is called when use_count_ drops to zero, to release |
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53 | // the resources managed by *this. |
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54 | |
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55 | virtual void dispose() = 0; // nothrow |
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56 | |
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57 | // destroy() is called when weak_count_ drops to zero. |
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58 | |
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59 | virtual void destroy() // nothrow |
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60 | { |
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61 | delete this; |
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62 | } |
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63 | |
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64 | virtual void * get_deleter( sp_typeinfo const & ti ) = 0; |
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65 | |
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66 | void add_ref_copy() |
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67 | { |
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68 | atomic_inc_32( &use_count_ ); |
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69 | } |
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70 | |
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71 | bool add_ref_lock() // true on success |
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72 | { |
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73 | for( ;; ) |
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74 | { |
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75 | uint32_t tmp = static_cast< uint32_t const volatile& >( use_count_ ); |
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76 | if( tmp == 0 ) return false; |
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77 | if( atomic_cas_32( &use_count_, tmp, tmp + 1 ) == tmp ) return true; |
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78 | } |
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79 | } |
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80 | |
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81 | void release() // nothrow |
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82 | { |
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83 | if( atomic_dec_32_nv( &use_count_ ) == 0 ) |
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84 | { |
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85 | dispose(); |
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86 | weak_release(); |
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87 | } |
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88 | } |
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89 | |
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90 | void weak_add_ref() // nothrow |
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91 | { |
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92 | atomic_inc_32( &weak_count_ ); |
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93 | } |
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94 | |
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95 | void weak_release() // nothrow |
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96 | { |
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97 | if( atomic_dec_32_nv( &weak_count_ ) == 0 ) |
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98 | { |
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99 | destroy(); |
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100 | } |
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101 | } |
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102 | |
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103 | long use_count() const // nothrow |
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104 | { |
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105 | return static_cast<long const volatile &>( use_count_ ); |
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106 | } |
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107 | }; |
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108 | |
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109 | } // namespace detail |
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110 | |
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111 | } // namespace boost |
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112 | |
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113 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SOLARIS_HPP_INCLUDED |
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