ceph/src/boost/libs/context/src/posix/stack_traits.cpp

   1
   2 //          Copyright Oliver Kowalke 2014.
   3 // Distributed under the Boost Software License, Version 1.0.
   4 //    (See accompanying file LICENSE_1_0.txt or copy at
   5 //          http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #include "boost/context/stack_traits.hpp"
   8
   9 extern "C" {
  10 #include <signal.h>
  11 #include <sys/resource.h>
  12 #include <sys/time.h>
  13 #include <unistd.h>
  14 }
  15
  16 //#if _POSIX_C_SOURCE >= 200112L
  17
  18 #include <algorithm>
  19 #include <cmath>
  20
  21 #include <boost/assert.hpp>
  22 #include <boost/config.hpp>
  23
  24 #if !defined (SIGSTKSZ)
  25 # define SIGSTKSZ (32768) // 32kb minimum allowable stack
  26 # define UDEF_SIGSTKSZ
  27 #endif
  28
  29 #if !defined (MINSIGSTKSZ)
  30 # define MINSIGSTKSZ (131072) // 128kb recommended stack size
  31 # define UDEF_MINSIGSTKSZ
  32 #endif
  33
  34 #ifdef BOOST_HAS_ABI_HEADERS
  35 #  include BOOST_ABI_PREFIX
  36 #endif
  37
  38 namespace {
  39
  40 std::size_t pagesize() BOOST_NOEXCEPT_OR_NOTHROW {
  41     // conform to POSIX.1-2001
  42     return ::sysconf( _SC_PAGESIZE);
  43 }
  44
  45 rlim_t stacksize_limit_() BOOST_NOEXCEPT_OR_NOTHROW {
  46     rlimit limit;
  47     // conforming to POSIX.1-2001
  48     ::getrlimit( RLIMIT_STACK, & limit);
  49     return limit.rlim_max;
  50 }
  51
  52 rlim_t stacksize_limit() BOOST_NOEXCEPT_OR_NOTHROW {
  53     static rlim_t limit = stacksize_limit_();
  54     return limit;
  55 }
  56
  57 }
  58
  59 namespace boost {
  60 namespace context {
  61
  62 bool
  63 stack_traits::is_unbounded() BOOST_NOEXCEPT_OR_NOTHROW {
  64     return RLIM_INFINITY == stacksize_limit();
  65 }
  66
  67 std::size_t
  68 stack_traits::page_size() BOOST_NOEXCEPT_OR_NOTHROW {
  69     static std::size_t size = pagesize();
  70     return size;
  71 }
  72
  73 std::size_t
  74 stack_traits::default_size() BOOST_NOEXCEPT_OR_NOTHROW {
  75     return 128 * 1024;
  76 }
  77
  78 std::size_t
  79 stack_traits::minimum_size() BOOST_NOEXCEPT_OR_NOTHROW {
  80     return MINSIGSTKSZ;
  81 }
  82
  83 std::size_t
  84 stack_traits::maximum_size() BOOST_NOEXCEPT_OR_NOTHROW {
  85     BOOST_ASSERT( ! is_unbounded() );
  86     return static_cast< std::size_t >( stacksize_limit() );
  87 }
  88
  89 }}
  90
  91 #ifdef BOOST_HAS_ABI_HEADERS
  92 #  include BOOST_ABI_SUFFIX
  93 #endif
  94
  95 #ifdef UDEF_SIGSTKSZ
  96 # undef SIGSTKSZ
  97 #endif
  98
  99 #ifdef UDEF_MINSIGSTKSZ
 100 # undef MINSIGSTKSZ
 101 #endif