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1 | |
2 | // Copyright Oliver Kowalke 2009. | |
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_COROUTINES_SEGMENTED_STACK_ALLOCATOR_H | |
8 | #define BOOST_COROUTINES_SEGMENTED_STACK_ALLOCATOR_H | |
9 | ||
10 | #include <cstddef> | |
11 | #include <new> | |
12 | ||
13 | #include <boost/config.hpp> | |
14 | ||
15 | #include <boost/coroutine/detail/config.hpp> | |
16 | #include <boost/coroutine/stack_context.hpp> | |
17 | #include <boost/coroutine/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 coroutines { | |
39 | ||
40 | template< typename traitsT > | |
41 | struct basic_segmented_stack_allocator | |
42 | { | |
43 | typedef traitsT traits_type; | |
44 | ||
45 | void allocate( stack_context & ctx, std::size_t size = traits_type::minimum_size() ) | |
46 | { | |
47 | void * limit = __splitstack_makecontext( size, ctx.segments_ctx, & ctx.size); | |
48 | if ( ! limit) throw std::bad_alloc(); | |
49 | ||
50 | // ctx.size is already filled by __splitstack_makecontext | |
51 | ctx.sp = static_cast< char * >( limit) + ctx.size; | |
52 | ||
53 | int off = 0; | |
54 | __splitstack_block_signals_context( ctx.segments_ctx, & off, 0); | |
55 | } | |
56 | ||
57 | void deallocate( stack_context & ctx) | |
58 | { __splitstack_releasecontext( ctx.segments_ctx); } | |
59 | }; | |
60 | ||
61 | typedef basic_segmented_stack_allocator< stack_traits > segmented_stack_allocator; | |
62 | ||
63 | }} | |
64 | ||
65 | #ifdef BOOST_HAS_ABI_HEADERS | |
66 | # include BOOST_ABI_SUFFIX | |
67 | #endif | |
68 | ||
69 | #endif // BOOST_COROUTINES_SEGMENTED_STACK_ALLOCATOR_H |