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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>
#if !defined (SIGSTKSZ)
# define SIGSTKSZ (32768) // 32kb minimum allowable stack
# define UDEF_SIGSTKSZ
#endif
#if !defined (MINSIGSTKSZ)
# define MINSIGSTKSZ (131072) // 128kb recommended stack size
# define UDEF_MINSIGSTKSZ
#endif
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
namespace {
std::size_t pagesize() BOOST_NOEXCEPT_OR_NOTHROW {
// conform to POSIX.1-2001
return static_cast<std::size_t>(::sysconf( _SC_PAGESIZE));
}
rlim_t stacksize_limit_() BOOST_NOEXCEPT_OR_NOTHROW {
rlimit limit;
// conforming to POSIX.1-2001
::getrlimit( RLIMIT_STACK, & limit);
return limit.rlim_max;
}
rlim_t stacksize_limit() BOOST_NOEXCEPT_OR_NOTHROW {
static rlim_t limit = stacksize_limit_();
return limit;
}
}
namespace boost {
namespace context {
bool
stack_traits::is_unbounded() BOOST_NOEXCEPT_OR_NOTHROW {
return RLIM_INFINITY == stacksize_limit();
}
std::size_t
stack_traits::page_size() BOOST_NOEXCEPT_OR_NOTHROW {
static std::size_t size = pagesize();
return size;
}
std::size_t
stack_traits::default_size() BOOST_NOEXCEPT_OR_NOTHROW {
return 128 * 1024;
}
std::size_t
stack_traits::minimum_size() BOOST_NOEXCEPT_OR_NOTHROW {
return static_cast<std::size_t>(MINSIGSTKSZ);
}
std::size_t
stack_traits::maximum_size() BOOST_NOEXCEPT_OR_NOTHROW {
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
#ifdef UDEF_MINSIGSTKSZ
# undef MINSIGSTKSZ
#endif
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