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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_SEGMENTED_H | |
8 | #define BOOST_CONTEXT_SEGMENTED_H | |
9 | ||
10 | #include <cstddef> | |
11 | #include <new> | |
12 | ||
13 | #include <boost/config.hpp> | |
14 | ||
15 | #include <boost/context/detail/config.hpp> | |
16 | #include <boost/context/stack_context.hpp> | |
17 | #include <boost/context/stack_traits.hpp> | |
18 | ||
19 | #ifdef BOOST_HAS_ABI_HEADERS | |
20 | # include BOOST_ABI_PREFIX | |
21 | #endif | |
22 | ||
23 | // forward declaration for splitstack-functions defined in libgcc | |
24 | extern "C" { | |
25 | void *__splitstack_makecontext( std::size_t, | |
26 | void * [BOOST_CONTEXT_SEGMENTS], | |
27 | std::size_t *); | |
28 | ||
29 | void __splitstack_releasecontext( void * [BOOST_CONTEXT_SEGMENTS]); | |
30 | ||
31 | void __splitstack_resetcontext( void * [BOOST_CONTEXT_SEGMENTS]); | |
32 | ||
33 | void __splitstack_block_signals_context( void * [BOOST_CONTEXT_SEGMENTS], | |
34 | int * new_value, int * old_value); | |
35 | } | |
36 | ||
37 | namespace boost { | |
38 | namespace context { | |
39 | ||
40 | template< typename traitsT > | |
41 | class basic_segmented_stack { | |
42 | private: | |
43 | std::size_t size_; | |
44 | ||
45 | public: | |
46 | typedef traitsT traits_type; | |
47 | ||
48 | basic_segmented_stack( std::size_t size = traits_type::default_size() ) BOOST_NOEXCEPT_OR_NOTHROW : | |
49 | size_( size) { | |
50 | BOOST_ASSERT( traits_type::minimum_size() <= size_); | |
51 | BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= size_) ); | |
52 | } | |
53 | ||
54 | stack_context allocate() { | |
55 | stack_context sctx; | |
56 | void * vp = __splitstack_makecontext( size_, sctx.segments_ctx, & sctx.size); | |
57 | if ( ! vp) throw std::bad_alloc(); | |
58 | ||
59 | // sctx.size is already filled by __splitstack_makecontext | |
60 | sctx.sp = static_cast< char * >( vp) + sctx.size; | |
61 | ||
62 | int off = 0; | |
63 | __splitstack_block_signals_context( sctx.segments_ctx, & off, 0); | |
64 | ||
65 | return sctx; | |
66 | } | |
67 | ||
68 | void deallocate( stack_context & sctx) BOOST_NOEXCEPT_OR_NOTHROW { | |
69 | __splitstack_releasecontext( sctx.segments_ctx); | |
70 | } | |
71 | }; | |
72 | ||
73 | typedef basic_segmented_stack< stack_traits > segmented_stack; | |
74 | # if defined(BOOST_USE_SEGMENTED_STACKS) | |
75 | typedef segmented_stack default_stack; | |
76 | # endif | |
77 | ||
78 | }} | |
79 | ||
80 | #ifdef BOOST_HAS_ABI_HEADERS | |
81 | # include BOOST_ABI_SUFFIX | |
82 | #endif | |
83 | ||
84 | #endif // BOOST_CONTEXT_SEGMENTED_H |