1 files changed, 81 insertions, 0 deletions
diff --git a/boost/context/fixedsize_stack.hpp b/boost/context/fixedsize_stack.hpp
new file mode 100644
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+++ b/boost/context/fixedsize_stack.hpp
@@ -0,0 +1,81 @@
+
+//          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() ) :
+        size_( size) {
+        BOOST_ASSERT( traits_type::minimum_size() <= size_);
+        BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_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_ASSERT( sctx.sp);
+        BOOST_ASSERT( traits_type::minimum_size() <= sctx.size);
+        BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= sctx.size) );
+
+#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;
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_CONTEXT_FIXEDSIZE_H