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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)
#include "boost/context/stack_traits.hpp"
extern "C" {
#include <windows.h>
}
//#if defined (BOOST_WINDOWS) || _POSIX_C_SOURCE >= 200112L
#include <algorithm>
#include <cmath>
#include <cstddef>
#include <cstring>
#include <stdexcept>
#include <boost/assert.hpp>
#include <boost/context/detail/config.hpp>
#if __cplusplus < 201103L
# include <boost/thread.hpp>
#else
# include <mutex>
#endif
#include <boost/context/stack_context.hpp>
// x86_64
// test x86_64 before i386 because icc might
// define __i686__ for x86_64 too
#if defined(__x86_64__) || defined(__x86_64) \
|| defined(__amd64__) || defined(__amd64) \
|| defined(_M_X64) || defined(_M_AMD64)
// Windows seams not to provide a constant or function
// telling the minimal stacksize
# define MIN_STACKSIZE 8 * 1024
#else
# define MIN_STACKSIZE 4 * 1024
#endif
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
namespace boost {
namespace context {
#if __cplusplus < 201103L
void system_info_( SYSTEM_INFO * si)
{ ::GetSystemInfo( si); }
SYSTEM_INFO system_info()
{
static SYSTEM_INFO si;
static boost::once_flag flag;
boost::call_once( flag, static_cast< void(*)( SYSTEM_INFO *) >( system_info_), & si);
return si;
}
#else
SYSTEM_INFO system_info()
{
static SYSTEM_INFO si;
static std::once_flag flag;
std::call_once( flag, [](){ ::GetSystemInfo( & si); } );
return si;
}
#endif
std::size_t pagesize()
{ return static_cast< std::size_t >( system_info().dwPageSize); }
std::size_t page_count( std::size_t stacksize)
{
return static_cast< std::size_t >(
std::floor(
static_cast< float >( stacksize) / pagesize() ) );
}
// Windows seams not to provide a limit for the stacksize
// libcoco uses 32k+4k bytes as minimum
bool
stack_traits::is_unbounded() BOOST_NOEXCEPT
{ return true; }
std::size_t
stack_traits::page_size() BOOST_NOEXCEPT
{ return pagesize(); }
std::size_t
stack_traits::default_size() BOOST_NOEXCEPT
{
std::size_t size = 64 * 1024; // 64 kB
if ( is_unbounded() )
return (std::max)( size, minimum_size() );
BOOST_ASSERT( maximum_size() >= minimum_size() );
return maximum_size() == minimum_size()
? minimum_size()
: ( std::min)( size, maximum_size() );
}
// because Windows seams not to provide a limit for minimum stacksize
std::size_t
stack_traits::minimum_size() BOOST_NOEXCEPT
{ return MIN_STACKSIZE; }
// because Windows seams not to provide a limit for maximum stacksize
// maximum_size() can never be called (pre-condition ! is_unbounded() )
std::size_t
stack_traits::maximum_size() BOOST_NOEXCEPT
{
BOOST_ASSERT( ! is_unbounded() );
return 1 * 1024 * 1024 * 1024; // 1GB
}
}}
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
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