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  1.  
  2. //          Copyright Oliver Kowalke 2009.
  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. #ifndef BOOST_COROUTINES_PROTECTED_STACK_ALLOCATOR_H
  8. #define BOOST_COROUTINES_PROTECTED_STACK_ALLOCATOR_H
  9.  
  10. extern "C" {
  11. #include <windows.h>
  12. }
  13.  
  14. #include <cmath>
  15. #include <cstddef>
  16. #include <new>
  17.  
  18. #include <boost/config.hpp>
  19.  
  20. #include <boost/coroutine/detail/config.hpp>
  21. #include <boost/coroutine/stack_traits.hpp>
  22.  
  23. #ifdef BOOST_HAS_ABI_HEADERS
  24. #  include BOOST_ABI_PREFIX
  25. #endif
  26.  
  27. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost {
  28. namespace coroutines {
  29.  
  30. struct stack_context;
  31.  
  32. template< typename traitsT >
  33. struct basic_protected_stack_allocator
  34. {
  35.     typedef traitsT traits_type;
  36.  
  37.     void allocate( stack_context & ctx, std::size_t size)
  38.     {
  39.         BOOST_ASSERT( traits_type::minimum_size() <= size);
  40.         BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= size) );
  41.  
  42.         // page at bottom will be used as guard-page
  43.         const std::size_t pages(
  44.             static_cast< std::size_t >(
  45.                 std::floor(
  46.                     static_cast< float >( size) / traits_type::page_size() ) ) );
  47.         BOOST_ASSERT_MSG( 2 <= pages, "at least two pages must fit into stack (one page is guard-page)");
  48.         const std::size_t size_ = pages * traits_type::page_size();
  49.         BOOST_ASSERT( 0 != size && 0 != size_);
  50.  
  51.         void * limit = ::VirtualAlloc( 0, size_, MEM_COMMIT, PAGE_READWRITE);
  52.         if ( ! limit) throw std::bad_alloc();
  53.  
  54.         DWORD old_options;
  55. #if defined(BOOST_DISABLE_ASSERTS)
  56.         ::VirtualProtect(
  57.             limit, traits_type::page_size(), PAGE_READWRITE | PAGE_GUARD /*PAGE_NOACCESS*/, & old_options);
  58. #else
  59.         const BOOL result = ::VirtualProtect(
  60.             limit, traits_type::page_size(), PAGE_READWRITE | PAGE_GUARD /*PAGE_NOACCESS*/, & old_options);
  61.         BOOST_ASSERT( FALSE != result);
  62. #endif
  63.  
  64.         ctx.size = size_;
  65.         ctx.sp = static_cast< char * >( limit) + ctx.size;
  66.     }
  67.  
  68.     void deallocate( stack_context & ctx)
  69.     {
  70.         BOOST_ASSERT( ctx.sp);
  71.         BOOST_ASSERT( traits_type::minimum_size() <= ctx.size);
  72.         BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= ctx.size) );
  73.  
  74.         void * limit = static_cast< char * >( ctx.sp) - ctx.size;
  75.         ::VirtualFree( limit, 0, MEM_RELEASE);
  76.     }
  77. };
  78.  
  79. typedef basic_protected_stack_allocator< stack_traits > protected_stack_allocator;
  80.  
  81. }}
  82.  
  83. #ifdef BOOST_HAS_ABI_HEADERS
  84. #  include BOOST_ABI_SUFFIX
  85. #endif
  86.  
  87. #endif // BOOST_COROUTINES_PROTECTED_STACK_ALLOCATOR_H
  88.  
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