1 #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SNC_PS3_HPP_INCLUDED
2 #define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SNC_PS3_HPP_INCLUDED
3
4 // MS compatible compilers support #pragma once
5 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
6 # pragma once
7 #endif
8
9 // detail/sp_counted_base_gcc_sparc.hpp - g++ on Sparc V8+
10 //
11 // Copyright (c) 2006 Piotr Wyderski
12 // Copyright (c) 2006 Tomas Puverle
13 // Copyright (c) 2006 Peter Dimov
14 // Copyright (c) 2011 Emil Dotchevski
15 //
16 // Distributed under the Boost Software License, Version 1.0.
17 // See accompanying file LICENSE_1_0.txt or copy at
18 // http://www.boost.org/LICENSE_1_0.txt
19 //
20 // Thanks to Michael van der Westhuizen
21
22 #include <boost/detail/sp_typeinfo.hpp>
23 #include <inttypes.h> // uint32_t
24
25 namespace boost
26 {
27
28 namespace detail
29 {
30
compare_and_swap(uint32_t * dest_,uint32_t compare_,uint32_t swap_)31 inline uint32_t compare_and_swap( uint32_t * dest_, uint32_t compare_, uint32_t swap_ )
32 {
33 return __builtin_cellAtomicCompareAndSwap32(dest_,compare_,swap_);
34 }
35
atomic_fetch_and_add(uint32_t * pw,uint32_t dv)36 inline uint32_t atomic_fetch_and_add( uint32_t * pw, uint32_t dv )
37 {
38 // long r = *pw;
39 // *pw += dv;
40 // return r;
41
42 for( ;; )
43 {
44 uint32_t r = *pw;
45
46 if( __builtin_expect((compare_and_swap(pw, r, r + dv) == r), 1) )
47 {
48 return r;
49 }
50 }
51 }
52
atomic_increment(uint32_t * pw)53 inline void atomic_increment( uint32_t * pw )
54 {
55 (void) __builtin_cellAtomicIncr32( pw );
56 }
57
atomic_decrement(uint32_t * pw)58 inline uint32_t atomic_decrement( uint32_t * pw )
59 {
60 return __builtin_cellAtomicDecr32( pw );
61 }
62
atomic_conditional_increment(uint32_t * pw)63 inline uint32_t atomic_conditional_increment( uint32_t * pw )
64 {
65 // long r = *pw;
66 // if( r != 0 ) ++*pw;
67 // return r;
68
69 for( ;; )
70 {
71 uint32_t r = *pw;
72
73 if( r == 0 )
74 {
75 return r;
76 }
77
78 if( __builtin_expect( ( compare_and_swap( pw, r, r + 1 ) == r ), 1 ) )
79 {
80 return r;
81 }
82 }
83 }
84
85 class sp_counted_base
86 {
87 private:
88
89 sp_counted_base( sp_counted_base const & );
90 sp_counted_base & operator= ( sp_counted_base const & );
91
92 uint32_t use_count_; // #shared
93 uint32_t weak_count_; // #weak + (#shared != 0)
94
95 public:
96
sp_counted_base()97 sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
98 {
99 }
100
~sp_counted_base()101 virtual ~sp_counted_base() // nothrow
102 {
103 }
104
105 // dispose() is called when use_count_ drops to zero, to release
106 // the resources managed by *this.
107
108 virtual void dispose() = 0; // nothrow
109
110 // destroy() is called when weak_count_ drops to zero.
111
destroy()112 virtual void destroy() // nothrow
113 {
114 delete this;
115 }
116
117 virtual void * get_deleter( sp_typeinfo const & ti ) = 0;
118 virtual void * get_local_deleter( sp_typeinfo const & ti ) = 0;
119 virtual void * get_untyped_deleter() = 0;
120
add_ref_copy()121 void add_ref_copy()
122 {
123 atomic_increment( &use_count_ );
124 }
125
add_ref_lock()126 bool add_ref_lock() // true on success
127 {
128 return atomic_conditional_increment( &use_count_ ) != 0;
129 }
130
release()131 void release() // nothrow
132 {
133 if( atomic_decrement( &use_count_ ) == 1 )
134 {
135 dispose();
136 weak_release();
137 }
138 }
139
weak_add_ref()140 void weak_add_ref() // nothrow
141 {
142 atomic_increment( &weak_count_ );
143 }
144
weak_release()145 void weak_release() // nothrow
146 {
147 if( atomic_decrement( &weak_count_ ) == 1 )
148 {
149 destroy();
150 }
151 }
152
use_count() const153 long use_count() const // nothrow
154 {
155 return const_cast< uint32_t const volatile & >( use_count_ );
156 }
157 };
158
159 } // namespace detail
160
161 } // namespace boost
162
163 #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SNC_PS3_HPP_INCLUDED
164