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2 | // Copyright Oliver Kowalke 2014. | |
3 | // Distributed under the Boost Software License, Version 1.0. | |
4 | // (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt) | |
6 | ||
7 | #ifndef BOOST_CONTEXT_POOLED_pooled_fixedsize_H | |
8 | #define BOOST_CONTEXT_POOLED_pooled_fixedsize_H | |
9 | ||
10 | #include <atomic> | |
11 | #include <cstddef> | |
12 | #include <cstdlib> | |
13 | #include <new> | |
14 | ||
15 | #include <boost/assert.hpp> | |
16 | #include <boost/config.hpp> | |
17 | #include <boost/pool/pool.hpp> | |
18 | ||
19 | #include <boost/context/detail/config.hpp> | |
20 | #include <boost/context/stack_context.hpp> | |
21 | #include <boost/context/stack_traits.hpp> | |
22 | ||
23 | #if defined(BOOST_USE_VALGRIND) | |
24 | #include <valgrind/valgrind.h> | |
25 | #endif | |
26 | ||
27 | #ifdef BOOST_HAS_ABI_HEADERS | |
28 | # include BOOST_ABI_PREFIX | |
29 | #endif | |
30 | ||
31 | namespace boost { | |
32 | namespace context { | |
33 | ||
34 | template< typename traitsT > | |
35 | class basic_pooled_fixedsize_stack { | |
36 | private: | |
37 | class storage { | |
38 | private: | |
39 | std::atomic< std::size_t > use_count_; | |
40 | std::size_t stack_size_; | |
41 | boost::pool< boost::default_user_allocator_malloc_free > storage_; | |
42 | ||
43 | public: | |
44 | storage( std::size_t stack_size, std::size_t next_size, std::size_t max_size) : | |
45 | use_count_( 0), | |
46 | stack_size_( stack_size), | |
47 | storage_( stack_size, next_size, max_size) { | |
48 | BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= stack_size_) ); | |
49 | } | |
50 | ||
51 | stack_context allocate() { | |
52 | void * vp = storage_.malloc(); | |
53 | if ( ! vp) { | |
54 | throw std::bad_alloc(); | |
55 | } | |
56 | stack_context sctx; | |
57 | sctx.size = stack_size_; | |
58 | sctx.sp = static_cast< char * >( vp) + sctx.size; | |
59 | #if defined(BOOST_USE_VALGRIND) | |
60 | sctx.valgrind_stack_id = VALGRIND_STACK_REGISTER( sctx.sp, vp); | |
61 | #endif | |
62 | return sctx; | |
63 | } | |
64 | ||
65 | void deallocate( stack_context & sctx) BOOST_NOEXCEPT_OR_NOTHROW { | |
66 | BOOST_ASSERT( sctx.sp); | |
67 | BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= sctx.size) ); | |
68 | ||
69 | #if defined(BOOST_USE_VALGRIND) | |
70 | VALGRIND_STACK_DEREGISTER( sctx.valgrind_stack_id); | |
71 | #endif | |
72 | void * vp = static_cast< char * >( sctx.sp) - sctx.size; | |
73 | storage_.free( vp); | |
74 | } | |
75 | ||
76 | friend void intrusive_ptr_add_ref( storage * s) noexcept { | |
77 | ++s->use_count_; | |
78 | } | |
79 | ||
80 | friend void intrusive_ptr_release( storage * s) noexcept { | |
81 | if ( 0 == --s->use_count_) { | |
82 | delete s; | |
83 | } | |
84 | } | |
85 | }; | |
86 | ||
87 | intrusive_ptr< storage > storage_; | |
88 | ||
89 | public: | |
90 | typedef traitsT traits_type; | |
91 | ||
92 | basic_pooled_fixedsize_stack( std::size_t stack_size = traits_type::default_size(), | |
93 | std::size_t next_size = 32, | |
94 | std::size_t max_size = 0) BOOST_NOEXCEPT_OR_NOTHROW : | |
95 | storage_( new storage( stack_size, next_size, max_size) ) { | |
96 | } | |
97 | ||
98 | stack_context allocate() { | |
99 | return storage_->allocate(); | |
100 | } | |
101 | ||
102 | void deallocate( stack_context & sctx) BOOST_NOEXCEPT_OR_NOTHROW { | |
103 | storage_->deallocate( sctx); | |
104 | } | |
105 | }; | |
106 | ||
107 | typedef basic_pooled_fixedsize_stack< stack_traits > pooled_fixedsize_stack; | |
108 | ||
109 | }} | |
110 | ||
111 | #ifdef BOOST_HAS_ABI_HEADERS | |
112 | # include BOOST_ABI_SUFFIX | |
113 | #endif | |
114 | ||
115 | #endif // BOOST_CONTEXT_POOLED_pooled_fixedsize_H |