update boost on linux

linx64/include/boost/context/posix/fixedsize_stack.hpp

@@ -1,80 +0,0 @@
-
-//          Copyright Oliver Kowalke 2014.
-// 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_CONTEXT_FIXEDSIZE_H
-#define BOOST_CONTEXT_FIXEDSIZE_H
-
-#include <cstddef>
-#include <cstdlib>
-#include <new>
-
-#include <boost/assert.hpp>
-#include <boost/config.hpp>
-
-#include <boost/context/detail/config.hpp>
-#include <boost/context/stack_context.hpp>
-#include <boost/context/stack_traits.hpp>
-
-#if defined(BOOST_USE_VALGRIND)
-#include <valgrind/valgrind.h>
-#endif
-
-#ifdef BOOST_HAS_ABI_HEADERS
-#  include BOOST_ABI_PREFIX
-#endif
-
-namespace boost {
-namespace context {
-
-template< typename traitsT >
-class basic_fixedsize_stack {
-private:
-    std::size_t     size_;
-
-public:
-    typedef traitsT traits_type;
-
-    basic_fixedsize_stack( std::size_t size = traits_type::default_size() ) BOOST_NOEXCEPT_OR_NOTHROW :
-        size_( size) {
-    }
-
-    stack_context allocate() {
-        void * vp = std::malloc( size_);
-        if ( ! vp) {
-            throw std::bad_alloc();
-        }
-        stack_context sctx;
-        sctx.size = size_;
-        sctx.sp = static_cast< char * >( vp) + sctx.size;
-#if defined(BOOST_USE_VALGRIND)
-        sctx.valgrind_stack_id = VALGRIND_STACK_REGISTER( sctx.sp, vp);
-#endif
-        return sctx;
-    }
-
-    void deallocate( stack_context & sctx) BOOST_NOEXCEPT_OR_NOTHROW {
-        BOOST_ASSERT( sctx.sp);
-
-#if defined(BOOST_USE_VALGRIND)
-        VALGRIND_STACK_DEREGISTER( sctx.valgrind_stack_id);
-#endif
-        void * vp = static_cast< char * >( sctx.sp) - sctx.size;
-        std::free( vp);
-    }
-};
-
-typedef basic_fixedsize_stack< stack_traits >  fixedsize_stack;
-# if ! defined(BOOST_USE_SEGMENTED_STACKS)
-typedef fixedsize_stack default_stack;
-# endif
-
-}}
-
-#ifdef BOOST_HAS_ABI_HEADERS
-#  include BOOST_ABI_SUFFIX
-#endif
-
-#endif // BOOST_CONTEXT_FIXEDSIZE_H

linx64/include/boost/context/posix/protected_fixedsize_stack.hpp

@@ -49,15 +49,13 @@ 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();
 
         // conform to POSIX.4 (POSIX.1b-1993, _POSIX_C_SOURCE=199309L)
 #if defined(MAP_ANON)