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1 | #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_ACC_IA64_HPP_INCLUDED |
2 | #define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_ACC_IA64_HPP_INCLUDED | |
3 | ||
4 | // | |
5 | // detail/sp_counted_base_acc_ia64.hpp - aC++ on HP-UX IA64 | |
6 | // | |
7 | // Copyright 2007 Baruch Zilber | |
8 | // Copyright 2007 Boris Gubenko | |
9 | // | |
10 | // Distributed under the Boost Software License, Version 1.0. (See | |
11 | // accompanying file LICENSE_1_0.txt or copy at | |
12 | // http://www.boost.org/LICENSE_1_0.txt) | |
13 | // | |
14 | // | |
15 | // Lock-free algorithm by Alexander Terekhov | |
16 | // | |
17 | ||
92f5a8d4 TL |
18 | #include <boost/smart_ptr/detail/sp_typeinfo_.hpp> |
19 | #include <boost/config.hpp> | |
7c673cae FG |
20 | #include <machine/sys/inline.h> |
21 | ||
22 | namespace boost | |
23 | { | |
24 | ||
25 | namespace detail | |
26 | { | |
27 | ||
28 | inline void atomic_increment( int * pw ) | |
29 | { | |
30 | // ++*pw; | |
31 | ||
32 | _Asm_fetchadd(_FASZ_W, _SEM_REL, pw, +1, _LDHINT_NONE); | |
33 | } | |
34 | ||
35 | inline int atomic_decrement( int * pw ) | |
36 | { | |
37 | // return --*pw; | |
38 | ||
39 | int r = static_cast<int>(_Asm_fetchadd(_FASZ_W, _SEM_REL, pw, -1, _LDHINT_NONE)); | |
40 | if (1 == r) | |
41 | { | |
42 | _Asm_mf(); | |
43 | } | |
44 | ||
45 | return r - 1; | |
46 | } | |
47 | ||
48 | inline int atomic_conditional_increment( int * pw ) | |
49 | { | |
50 | // if( *pw != 0 ) ++*pw; | |
51 | // return *pw; | |
52 | ||
53 | int v = *pw; | |
54 | ||
55 | for (;;) | |
56 | { | |
57 | if (0 == v) | |
58 | { | |
59 | return 0; | |
60 | } | |
61 | ||
62 | _Asm_mov_to_ar(_AREG_CCV, | |
63 | v, | |
64 | (_UP_CALL_FENCE | _UP_SYS_FENCE | _DOWN_CALL_FENCE | _DOWN_SYS_FENCE)); | |
65 | int r = static_cast<int>(_Asm_cmpxchg(_SZ_W, _SEM_ACQ, pw, v + 1, _LDHINT_NONE)); | |
66 | if (r == v) | |
67 | { | |
68 | return r + 1; | |
69 | } | |
70 | ||
71 | v = r; | |
72 | } | |
73 | } | |
74 | ||
92f5a8d4 | 75 | class BOOST_SYMBOL_VISIBLE sp_counted_base |
7c673cae FG |
76 | { |
77 | private: | |
78 | ||
79 | sp_counted_base( sp_counted_base const & ); | |
80 | sp_counted_base & operator= ( sp_counted_base const & ); | |
81 | ||
82 | int use_count_; // #shared | |
83 | int weak_count_; // #weak + (#shared != 0) | |
84 | ||
85 | public: | |
86 | ||
87 | sp_counted_base(): use_count_( 1 ), weak_count_( 1 ) | |
88 | { | |
89 | } | |
90 | ||
91 | virtual ~sp_counted_base() // nothrow | |
92 | { | |
93 | } | |
94 | ||
95 | // dispose() is called when use_count_ drops to zero, to release | |
96 | // the resources managed by *this. | |
97 | ||
98 | virtual void dispose() = 0; // nothrow | |
99 | ||
100 | // destroy() is called when weak_count_ drops to zero. | |
101 | ||
102 | virtual void destroy() // nothrow | |
103 | { | |
104 | delete this; | |
105 | } | |
106 | ||
92f5a8d4 TL |
107 | virtual void * get_deleter( sp_typeinfo_ const & ti ) = 0; |
108 | virtual void * get_local_deleter( sp_typeinfo_ const & ti ) = 0; | |
7c673cae FG |
109 | virtual void * get_untyped_deleter() = 0; |
110 | ||
111 | void add_ref_copy() | |
112 | { | |
113 | atomic_increment( &use_count_ ); | |
114 | } | |
115 | ||
116 | bool add_ref_lock() // true on success | |
117 | { | |
118 | return atomic_conditional_increment( &use_count_ ) != 0; | |
119 | } | |
120 | ||
121 | void release() // nothrow | |
122 | { | |
123 | if( atomic_decrement( &use_count_ ) == 0 ) | |
124 | { | |
125 | dispose(); | |
126 | weak_release(); | |
127 | } | |
128 | } | |
129 | ||
130 | void weak_add_ref() // nothrow | |
131 | { | |
132 | atomic_increment( &weak_count_ ); | |
133 | } | |
134 | ||
135 | void weak_release() // nothrow | |
136 | { | |
137 | if( atomic_decrement( &weak_count_ ) == 0 ) | |
138 | { | |
139 | destroy(); | |
140 | } | |
141 | } | |
142 | ||
143 | long use_count() const // nothrow | |
144 | { | |
145 | return static_cast<int const volatile &>( use_count_ ); // TODO use ld.acq here | |
146 | } | |
147 | }; | |
148 | ||
149 | } // namespace detail | |
150 | ||
151 | } // namespace boost | |
152 | ||
153 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_ACC_IA64_HPP_INCLUDED |