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