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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 <signal.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <unistd.h>
}
//#if _POSIX_C_SOURCE >= 200112L
#include <algorithm>
#include <cmath>
#include <boost/assert.hpp>
#include <boost/config.hpp>
# include <boost/thread.hpp>
#if !defined (SIGSTKSZ)
# define SIGSTKSZ (8 * 1024)
# define UDEF_SIGSTKSZ
#endif
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
namespace boost {
namespace context {
void pagesize_( std::size_t * size)
{
// conform to POSIX.1-2001
* size = ::sysconf( _SC_PAGESIZE);
}
void stacksize_limit_( rlimit * limit)
{
// conforming to POSIX.1-2001
#if defined(BOOST_DISABLE_ASSERTS)
::getrlimit( RLIMIT_STACK, limit);
#else
const int result = ::getrlimit( RLIMIT_STACK, limit);
BOOST_ASSERT( 0 == result);
(void)result;
#endif
}
std::size_t pagesize()
{
static std::size_t size = 0;
static boost::once_flag flag;
boost::call_once( flag, pagesize_, & size);
return size;
}
rlimit stacksize_limit()
{
static rlimit limit;
static boost::once_flag flag;
boost::call_once( flag, stacksize_limit_, & limit);
return limit;
}
bool
stack_traits::is_unbounded() BOOST_NOEXCEPT
{ return RLIM_INFINITY == stacksize_limit().rlim_max; }
std::size_t
stack_traits::page_size() BOOST_NOEXCEPT
{ return pagesize(); }
std::size_t
stack_traits::default_size() BOOST_NOEXCEPT
{
std::size_t size = 8 * minimum_size();
if ( is_unbounded() ) return size;
BOOST_ASSERT( maximum_size() >= minimum_size() );
return maximum_size() == size
? size
: (std::min)( size, maximum_size() );
}
std::size_t
stack_traits::minimum_size() BOOST_NOEXCEPT
{ return SIGSTKSZ; }
std::size_t
stack_traits::maximum_size() BOOST_NOEXCEPT
{
BOOST_ASSERT( ! is_unbounded() );
return static_cast< std::size_t >( stacksize_limit().rlim_max);
}
}}
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#ifdef UDEF_SIGSTKSZ
# undef SIGSTKSZ
#endif
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