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// Copyright Oliver Kowalke 2009.
// 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/coroutine/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>
#if !defined (SIGSTKSZ)
# define SIGSTKSZ (8 * 1024)
# define UDEF_SIGSTKSZ
#endif
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
namespace {
std::size_t pagesize()
{
// conform to POSIX.1-2001
return static_cast<std::size_t>( ::sysconf( _SC_PAGESIZE) );
}
rlim_t stacksize_limit_()
{
rlimit limit;
// conforming to POSIX.1-2001
#if defined(BOOST_DISABLE_ASSERTS) || defined(NDEBUG)
::getrlimit( RLIMIT_STACK, & limit);
#else
const int result = ::getrlimit( RLIMIT_STACK, & limit);
BOOST_ASSERT( 0 == result);
#endif
return limit.rlim_max;
}
rlim_t stacksize_limit() BOOST_NOEXCEPT_OR_NOTHROW {
static rlim_t limit = stacksize_limit_();
return limit;
}
}
namespace boost {
namespace coroutines {
bool
stack_traits::is_unbounded() BOOST_NOEXCEPT
{ return RLIM_INFINITY == stacksize_limit(); }
std::size_t
stack_traits::page_size() BOOST_NOEXCEPT
{
static std::size_t size = pagesize();
return size;
}
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 static_cast<std::size_t>( SIGSTKSZ ); }
std::size_t
stack_traits::maximum_size() BOOST_NOEXCEPT
{
BOOST_ASSERT( ! is_unbounded() );
return static_cast< std::size_t >( stacksize_limit() );
}
}}
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#ifdef UDEF_SIGSTKSZ
# undef SIGSTKSZ
#endif
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