Imported Upstream version 1.65.0upstream/1.65.0

Change-Id: Icf8400b375482cb11bcf77440a6934ba360d6ba4
Signed-off-by: DongHun Kwak <dh0128.kwak@samsung.com>

1 files changed, 6 insertions, 8 deletions

diff --git a/boost/context/windows/protected_fixedsize_stack.hpp b/boost/context/windows/protected_fixedsize_stack.hpp
index 437f091088..26d2086095 100644
--- a/boost/context/windows/protected_fixedsize_stack.hpp
+++ b/boost/context/windows/protected_fixedsize_stack.hpp
@@ -41,15 +41,13 @@ public:
     }
 
     stack_context allocate() {
-        // page at bottom will be used as guard-page
-        const std::size_t pages(
-            static_cast< std::size_t >( 
-                std::floor(
+        // calculate how many pages are required
+        const std::size_t pages(        
+            static_cast< std::size_t >(
+                std::ceil(
                     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__);
-        BOOST_ASSERT( size__ <= size_);
+        // add one page at bottom that will be used as guard-page
+        const std::size_t size__ = ( pages + 1) * traits_type::page_size();
 
         void * vp = ::VirtualAlloc( 0, size__, MEM_COMMIT, PAGE_READWRITE);
         if ( ! vp) throw std::bad_alloc();