1 files changed, 87 insertions, 0 deletions
diff --git a/boost/coroutine/windows/protected_stack_allocator.hpp b/boost/coroutine/windows/protected_stack_allocator.hpp
new file mode 100644
index 0000000000..293901223b
--- /dev/null
+++ b/boost/coroutine/windows/protected_stack_allocator.hpp
@@ -0,0 +1,87 @@
+
+//          Copyright Oliver Kowalke 2009.
+// 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)
+
+#ifndef BOOST_COROUTINES_PROTECTED_STACK_ALLOCATOR_H
+#define BOOST_COROUTINES_PROTECTED_STACK_ALLOCATOR_H
+
+extern "C" {
+#include <windows.h>
+}
+
+#include <cmath>
+#include <cstddef>
+#include <new>
+
+#include <boost/config.hpp>
+
+#include <boost/coroutine/detail/config.hpp>
+#include <boost/coroutine/stack_traits.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace coroutines {
+
+struct stack_context;
+
+template< typename traitsT >
+struct basic_protected_stack_allocator
+{
+    typedef traitsT traits_type;
+
+    void allocate( stack_context & ctx, std::size_t size)
+    {
+        BOOST_ASSERT( traits_type::minimum_size() <= size);
+        BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= size) );
+
+        // page at bottom will be used as guard-page
+        const std::size_t pages(
+            static_cast< std::size_t >( 
+                std::floor(
+                    static_cast< float >( size) / traits_type::page_size() ) ) );
+        BOOST_ASSERT_MSG( 2 <= pages, "at least two pages must fit into stack (one page is guard-page)");
+        const std::size_t size_ = pages * traits_type::page_size();
+        BOOST_ASSERT( 0 < size && 0 < size_);
+
+        void * limit = ::VirtualAlloc( 0, size_, MEM_COMMIT, PAGE_READWRITE);
+        if ( ! limit) throw std::bad_alloc();
+
+        DWORD old_options;
+#if defined(BOOST_DISABLE_ASSERTS)
+        ::VirtualProtect(
+            limit, traits_type::page_size(), PAGE_READWRITE | PAGE_GUARD /*PAGE_NOACCESS*/, & old_options);
+#else
+        const BOOL result = ::VirtualProtect(
+            limit, traits_type::page_size(), PAGE_READWRITE | PAGE_GUARD /*PAGE_NOACCESS*/, & old_options);
+        BOOST_ASSERT( FALSE != result);
+#endif
+
+        ctx.size = size_;
+        ctx.sp = static_cast< char * >( limit) + ctx.size;
+    }
+
+    void deallocate( stack_context & ctx)
+    {
+        BOOST_ASSERT( ctx.sp);
+        BOOST_ASSERT( traits_type::minimum_size() <= ctx.size);
+        BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= ctx.size) );
+
+        void * limit = static_cast< char * >( ctx.sp) - ctx.size;
+        ::VirtualFree( limit, 0, MEM_RELEASE);
+    }
+};
+
+typedef basic_protected_stack_allocator< stack_traits > protected_stack_allocator;
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_COROUTINES_PROTECTED_STACK_ALLOCATOR_H