2 // Copyright Oliver Kowalke 2014.
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)
7 #ifndef BOOST_CONTEXT_FIXEDSIZE_H
8 #define BOOST_CONTEXT_FIXEDSIZE_H
14 #include <boost/assert.hpp>
15 #include <boost/config.hpp>
17 #include <boost/context/detail/config.hpp>
18 #include <boost/context/stack_context.hpp>
19 #include <boost/context/stack_traits.hpp>
21 #if defined(BOOST_CONTEXT_USE_MAP_STACK)
27 #if defined(BOOST_USE_VALGRIND)
28 #include <valgrind/valgrind.h>
31 #ifdef BOOST_HAS_ABI_HEADERS
32 # include BOOST_ABI_PREFIX
38 template< typename traitsT >
39 class basic_fixedsize_stack {
44 typedef traitsT traits_type;
46 basic_fixedsize_stack( std::size_t size = traits_type::default_size() ) BOOST_NOEXCEPT_OR_NOTHROW :
50 stack_context allocate() {
51 #if defined(BOOST_CONTEXT_USE_MAP_STACK)
52 void * vp = ::mmap( 0, size_, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | MAP_STACK, -1, 0);
53 if ( vp == MAP_FAILED) {
54 throw std::bad_alloc();
57 void * vp = std::malloc( size_);
59 throw std::bad_alloc();
64 sctx.sp = static_cast< char * >( vp) + sctx.size;
65 #if defined(BOOST_USE_VALGRIND)
66 sctx.valgrind_stack_id = VALGRIND_STACK_REGISTER( sctx.sp, vp);
71 void deallocate( stack_context & sctx) BOOST_NOEXCEPT_OR_NOTHROW {
72 BOOST_ASSERT( sctx.sp);
74 #if defined(BOOST_USE_VALGRIND)
75 VALGRIND_STACK_DEREGISTER( sctx.valgrind_stack_id);
77 void * vp = static_cast< char * >( sctx.sp) - sctx.size;
78 #if defined(BOOST_CONTEXT_USE_MAP_STACK)
79 ::munmap( vp, sctx.size);
86 typedef basic_fixedsize_stack< stack_traits > fixedsize_stack;
87 # if ! defined(BOOST_USE_SEGMENTED_STACKS)
88 typedef fixedsize_stack default_stack;
93 #ifdef BOOST_HAS_ABI_HEADERS
94 # include BOOST_ABI_SUFFIX
97 #endif // BOOST_CONTEXT_FIXEDSIZE_H