|
// 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_CONTEXT_USE_MAP_STACK)
|
extern "C" {
|
#include <sys/mman.h>
|
}
|
#endif
|
|
#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() {
|
#if defined(BOOST_CONTEXT_USE_MAP_STACK)
|
void * vp = ::mmap( 0, size_, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | MAP_STACK, -1, 0);
|
if ( vp == MAP_FAILED) {
|
throw std::bad_alloc();
|
}
|
#else
|
void * vp = std::malloc( size_);
|
if ( ! vp) {
|
throw std::bad_alloc();
|
}
|
#endif
|
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;
|
#if defined(BOOST_CONTEXT_USE_MAP_STACK)
|
::munmap( vp, sctx.size);
|
#else
|
std::free( vp);
|
#endif
|
}
|
};
|
|
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
|
