ceph/src/boost/libs/context/src/windows/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 <windows.h>
  11 }
  12
  13 //#if defined (BOOST_WINDOWS) || _POSIX_C_SOURCE >= 200112L
  14
  15 #include <algorithm>
  16 #include <cmath>
  17 #include <cstddef>
  18 #include <cstring>
  19 #include <stdexcept>
  20
  21 #include <boost/assert.hpp>
  22 #include <boost/context/detail/config.hpp>
  23 #if defined(BOOST_NO_CXX11_HDR_MUTEX)
  24 # include <boost/thread.hpp>
  25 #else
  26 # include <mutex>
  27 #endif
  28
  29 #include <boost/context/stack_context.hpp>
  30
  31 // x86_64
  32 // test x86_64 before i386 because icc might
  33 // define __i686__ for x86_64 too
  34 #if defined(__x86_64__) || defined(__x86_64) \
  35     || defined(__amd64__) || defined(__amd64) \
  36     || defined(_M_X64) || defined(_M_AMD64)
  37
  38 // Windows seams not to provide a constant or function
  39 // telling the minimal stacksize
  40 # define MIN_STACKSIZE  8 * 1024
  41 #else
  42 # define MIN_STACKSIZE  4 * 1024
  43 #endif
  44
  45 #ifdef BOOST_HAS_ABI_HEADERS
  46 #  include BOOST_ABI_PREFIX
  47 #endif
  48
  49 namespace {
  50
  51 void system_info_( SYSTEM_INFO * si) BOOST_NOEXCEPT_OR_NOTHROW {
  52     ::GetSystemInfo( si);
  53 }
  54
  55 SYSTEM_INFO system_info() BOOST_NOEXCEPT_OR_NOTHROW {
  56     static SYSTEM_INFO si;
  57 #if defined(BOOST_NO_CXX11_HDR_MUTEX)
  58     static boost::once_flag flag = BOOST_ONCE_INIT;
  59     boost::call_once( flag, static_cast< void(*)( SYSTEM_INFO *) >( system_info_), & si);
  60 #else
  61     static std::once_flag flag;
  62     std::call_once( flag, static_cast< void(*)( SYSTEM_INFO *) >( system_info_), & si);
  63 #endif
  64     return si;
  65 }
  66
  67 std::size_t pagesize() BOOST_NOEXCEPT_OR_NOTHROW {
  68     return static_cast< std::size_t >( system_info().dwPageSize);
  69 }
  70
  71 }
  72
  73 namespace boost {
  74 namespace context {
  75
  76 // Windows seams not to provide a limit for the stacksize
  77 // libcoco uses 32k+4k bytes as minimum
  78 BOOST_CONTEXT_DECL
  79 bool
  80 stack_traits::is_unbounded() BOOST_NOEXCEPT_OR_NOTHROW {
  81     return true;
  82 }
  83
  84 BOOST_CONTEXT_DECL
  85 std::size_t
  86 stack_traits::page_size() BOOST_NOEXCEPT_OR_NOTHROW {
  87     return pagesize();
  88 }
  89
  90 BOOST_CONTEXT_DECL
  91 std::size_t
  92 stack_traits::default_size() BOOST_NOEXCEPT_OR_NOTHROW {
  93     return 128 * 1024;
  94 }
  95
  96 // because Windows seams not to provide a limit for minimum stacksize
  97 BOOST_CONTEXT_DECL
  98 std::size_t
  99 stack_traits::minimum_size() BOOST_NOEXCEPT_OR_NOTHROW {
 100     return MIN_STACKSIZE;
 101 }
 102
 103 // because Windows seams not to provide a limit for maximum stacksize
 104 // maximum_size() can never be called (pre-condition ! is_unbounded() )
 105 BOOST_CONTEXT_DECL
 106 std::size_t
 107 stack_traits::maximum_size() BOOST_NOEXCEPT_OR_NOTHROW {
 108     BOOST_ASSERT( ! is_unbounded() );
 109     return  1 * 1024 * 1024 * 1024; // 1GB
 110 }
 111
 112 }}
 113
 114 #ifdef BOOST_HAS_ABI_HEADERS
 115 #  include BOOST_ABI_SUFFIX
 116 #endif