projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
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 | ||
| 92f5a8d4 TL |
21 | #if defined(BOOST_CONTEXT_USE_MAP_STACK) |
| 22 | extern "C" { | |
| 23 | #include <sys/mman.h> | |
| 24 | } | |
| 25 | #endif | |
| 26 | ||
| 7c673cae FG |
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) { | |
| 7c673cae FG |
48 | } |
| 49 | ||
| 50 | stack_context allocate() { | |
| 92f5a8d4 TL |
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 | |
| 7c673cae FG |
57 | void * vp = std::malloc( size_); |
| 58 | if ( ! vp) { | |
| 59 | throw std::bad_alloc(); | |
| 60 | } | |
| 92f5a8d4 | 61 | #endif |
| 7c673cae FG |
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); | |
| 7c673cae FG |
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; | |
| 92f5a8d4 TL |
78 | #if defined(BOOST_CONTEXT_USE_MAP_STACK) |
| 79 | ::munmap( vp, sctx.size); | |
| 80 | #else | |
| 7c673cae | 81 | std::free( vp); |
| 92f5a8d4 | 82 | #endif |
| 7c673cae FG |
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 |