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Diffstat (limited to 'boost/context/windows/fixedsize_stack.hpp')
-rw-r--r-- | boost/context/windows/fixedsize_stack.hpp | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/boost/context/windows/fixedsize_stack.hpp b/boost/context/windows/fixedsize_stack.hpp new file mode 100644 index 0000000000..a67c315c47 --- /dev/null +++ b/boost/context/windows/fixedsize_stack.hpp @@ -0,0 +1,80 @@ + +// Copyright Oliver Kowalke 2014. +// Distributed under the Boost Software License, Version 1.0. +// (See accompanying file LICENSE_1_0.txt or copy at +// http://www.boost.org/LICENSE_1_0.txt) + +#ifndef BOOST_CONTEXT_FIXEDSIZE_H +#define BOOST_CONTEXT_FIXEDSIZE_H + +extern "C" { +#include <windows.h> +} + +#include <cmath> +#include <cstddef> +#include <new> + +#include <boost/config.hpp> + +#include <boost/context/detail/config.hpp> +#include <boost/context/stack_context.hpp> +#include <boost/context/stack_traits.hpp> + +#ifdef BOOST_HAS_ABI_HEADERS +# include BOOST_ABI_PREFIX +#endif + +namespace boost { +namespace context { + +template< typename traitsT > +class basic_fixedsize_stack { +private: + std::size_t size_; + +public: + typedef traitsT traits_type; + + basic_fixedsize_stack( std::size_t size = traits_type::default_size() ) BOOST_NOEXCEPT_OR_NOTHROW : + size_( size) { + } + + stack_context allocate() { + // page at bottom will be used as guard-page + const std::size_t pages( + static_cast< std::size_t >( + std::floor( + static_cast< float >( size_) / traits_type::page_size() ) ) ); + BOOST_ASSERT_MSG( 1 <= pages, "at least one page must fit into stack"); + const std::size_t size__( pages * traits_type::page_size() ); + BOOST_ASSERT( 0 != size_ && 0 != size__); + BOOST_ASSERT( size__ <= size_); + + void * vp = ::VirtualAlloc( 0, size__, MEM_COMMIT, PAGE_READWRITE); + if ( ! vp) throw std::bad_alloc(); + + stack_context sctx; + sctx.size = size__; + sctx.sp = static_cast< char * >( vp) + sctx.size; + return sctx; + } + + void deallocate( stack_context & sctx) BOOST_NOEXCEPT_OR_NOTHROW { + BOOST_ASSERT( sctx.sp); + + void * vp = static_cast< char * >( sctx.sp) - sctx.size; + ::VirtualFree( vp, 0, MEM_RELEASE); + } +}; + +typedef basic_fixedsize_stack< stack_traits > fixedsize_stack; +typedef fixedsize_stack default_stack; + +}} + +#ifdef BOOST_HAS_ABI_HEADERS +# include BOOST_ABI_SUFFIX +#endif + +#endif // BOOST_CONTEXT_FIXEDSIZE_H |