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101 lines
2.0 KiB
C++
101 lines
2.0 KiB
C++
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// Copyright Oliver Kowalke 2014.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include "boost/context/stack_traits.hpp"
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extern "C" {
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#include <signal.h>
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#include <sys/resource.h>
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#include <sys/time.h>
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#include <unistd.h>
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}
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//#if _POSIX_C_SOURCE >= 200112L
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#include <algorithm>
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#include <cmath>
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#include <boost/assert.hpp>
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#include <boost/config.hpp>
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#if !defined (SIGSTKSZ)
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# define SIGSTKSZ (32768) // 32kb minimum allowable stack
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# define UDEF_SIGSTKSZ
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#endif
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#if !defined (MINSIGSTKSZ)
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# define MINSIGSTKSZ (131072) // 128kb recommended stack size
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# define UDEF_MINSIGSTKSZ
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#endif
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_PREFIX
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#endif
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namespace {
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std::size_t pagesize() BOOST_NOEXCEPT_OR_NOTHROW {
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// conform to POSIX.1-2001
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return ::sysconf( _SC_PAGESIZE);
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}
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rlim_t stacksize_limit_() BOOST_NOEXCEPT_OR_NOTHROW {
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rlimit limit;
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// conforming to POSIX.1-2001
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::getrlimit( RLIMIT_STACK, & limit);
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return limit.rlim_max;
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}
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rlim_t stacksize_limit() BOOST_NOEXCEPT_OR_NOTHROW {
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static rlim_t limit = stacksize_limit_();
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return limit;
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}
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}
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namespace std {
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bool
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stack_traits::is_unbounded() BOOST_NOEXCEPT_OR_NOTHROW {
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return RLIM_INFINITY == stacksize_limit();
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}
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std::size_t
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stack_traits::page_size() BOOST_NOEXCEPT_OR_NOTHROW {
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static std::size_t size = pagesize();
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return size;
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}
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std::size_t
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stack_traits::default_size() BOOST_NOEXCEPT_OR_NOTHROW {
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return 128 * 1024;
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}
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std::size_t
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stack_traits::minimum_size() BOOST_NOEXCEPT_OR_NOTHROW {
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return MINSIGSTKSZ;
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}
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std::size_t
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stack_traits::maximum_size() BOOST_NOEXCEPT_OR_NOTHROW {
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BOOST_ASSERT( ! is_unbounded() );
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return static_cast< std::size_t >( stacksize_limit() );
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}
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}
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_SUFFIX
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#endif
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#ifdef UDEF_SIGSTKSZ
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# undef SIGSTKSZ
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#endif
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#ifdef UDEF_MINSIGSTKSZ
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# undef MINSIGSTKSZ
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#endif
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