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1 | ||
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_FIXEDSIZE_H | |
8 | #define BOOST_CONTEXT_FIXEDSIZE_H | |
9 | ||
10 | #include <cstddef> | |
11 | #include <cstdlib> | |
12 | #include <new> | |
13 | ||
14 | #include <boost/assert.hpp> | |
15 | #include <boost/config.hpp> | |
16 | ||
17 | #include <boost/context/detail/config.hpp> | |
18 | #include <boost/context/stack_context.hpp> | |
19 | #include <boost/context/stack_traits.hpp> | |
20 | ||
21 | #if defined(BOOST_CONTEXT_USE_MAP_STACK) | |
22 | extern "C" { | |
23 | #include <sys/mman.h> | |
24 | } | |
25 | #endif | |
26 | ||
27 | #if defined(BOOST_USE_VALGRIND) | |
28 | #include <valgrind/valgrind.h> | |
29 | #endif | |
30 | ||
31 | #ifdef BOOST_HAS_ABI_HEADERS | |
32 | # include BOOST_ABI_PREFIX | |
33 | #endif | |
34 | ||
35 | namespace boost { | |
36 | namespace context { | |
37 | ||
38 | template< typename traitsT > | |
39 | class basic_fixedsize_stack { | |
40 | private: | |
41 | std::size_t size_; | |
42 | ||
43 | public: | |
44 | typedef traitsT traits_type; | |
45 | ||
46 | basic_fixedsize_stack( std::size_t size = traits_type::default_size() ) BOOST_NOEXCEPT_OR_NOTHROW : | |
47 | size_( size) { | |
48 | } | |
49 | ||
50 | stack_context allocate() { | |
51 | #if defined(BOOST_CONTEXT_USE_MAP_STACK) | |
52 | void * vp = ::mmap( 0, size_, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | MAP_STACK, -1, 0); | |
53 | if ( vp == MAP_FAILED) { | |
54 | throw std::bad_alloc(); | |
55 | } | |
56 | #else | |
57 | void * vp = std::malloc( size_); | |
58 | if ( ! vp) { | |
59 | throw std::bad_alloc(); | |
60 | } | |
61 | #endif | |
62 | stack_context sctx; | |
63 | sctx.size = size_; | |
64 | sctx.sp = static_cast< char * >( vp) + sctx.size; | |
65 | #if defined(BOOST_USE_VALGRIND) | |
66 | sctx.valgrind_stack_id = VALGRIND_STACK_REGISTER( sctx.sp, vp); | |
67 | #endif | |
68 | return sctx; | |
69 | } | |
70 | ||
71 | void deallocate( stack_context & sctx) BOOST_NOEXCEPT_OR_NOTHROW { | |
72 | BOOST_ASSERT( sctx.sp); | |
73 | ||
74 | #if defined(BOOST_USE_VALGRIND) | |
75 | VALGRIND_STACK_DEREGISTER( sctx.valgrind_stack_id); | |
76 | #endif | |
77 | void * vp = static_cast< char * >( sctx.sp) - sctx.size; | |
78 | #if defined(BOOST_CONTEXT_USE_MAP_STACK) | |
79 | ::munmap( vp, sctx.size); | |
80 | #else | |
81 | std::free( vp); | |
82 | #endif | |
83 | } | |
84 | }; | |
85 | ||
86 | typedef basic_fixedsize_stack< stack_traits > fixedsize_stack; | |
87 | # if ! defined(BOOST_USE_SEGMENTED_STACKS) | |
88 | typedef fixedsize_stack default_stack; | |
89 | # endif | |
90 | ||
91 | }} | |
92 | ||
93 | #ifdef BOOST_HAS_ABI_HEADERS | |
94 | # include BOOST_ABI_SUFFIX | |
95 | #endif | |
96 | ||
97 | #endif // BOOST_CONTEXT_FIXEDSIZE_H |