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// 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
#include <cstddef>
#include <cstdlib>
#include <new>
#include <boost/assert.hpp>
#include <boost/config.hpp>
#include <boost/context/detail/config.hpp>
#include <boost/context/stack_context.hpp>
#include <boost/context/stack_traits.hpp>
#if defined(BOOST_USE_VALGRIND)
#include <valgrind/valgrind.h>
#endif
#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() ) :
size_( size) {
BOOST_ASSERT( traits_type::minimum_size() <= size_);
BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= size_) );
}
stack_context allocate() {
void * vp = std::malloc( size_);
if ( ! vp) throw std::bad_alloc();
stack_context sctx;
sctx.size = size_;
sctx.sp = static_cast< char * >( vp) + sctx.size;
#if defined(BOOST_USE_VALGRIND)
sctx.valgrind_stack_id = VALGRIND_STACK_REGISTER( sctx.sp, vp);
#endif
return sctx;
}
void deallocate( stack_context & sctx) {
BOOST_ASSERT( sctx.sp);
BOOST_ASSERT( traits_type::minimum_size() <= sctx.size);
BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= sctx.size) );
#if defined(BOOST_USE_VALGRIND)
VALGRIND_STACK_DEREGISTER( sctx.valgrind_stack_id);
#endif
void * vp = static_cast< char * >( sctx.sp) - sctx.size;
std::free( vp);
}
};
typedef basic_fixedsize_stack< stack_traits > fixedsize_stack;
}}
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#endif // BOOST_CONTEXT_FIXEDSIZE_H
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