91 lines
2.4 KiB
C++
91 lines
2.4 KiB
C++
|
|
||
|
// Copyright Oliver Kowalke 2009.
|
||
|
// 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_COROUTINES_STANDARD_STACK_ALLOCATOR_H
|
||
|
#define BOOST_COROUTINES_STANDARD_STACK_ALLOCATOR_H
|
||
|
|
||
|
#if defined(BOOST_USE_VALGRIND)
|
||
|
#include <valgrind/valgrind.h>
|
||
|
#endif
|
||
|
|
||
|
#include <cstddef>
|
||
|
#include <cstdlib>
|
||
|
#include <new>
|
||
|
|
||
|
#include <boost/assert.hpp>
|
||
|
#include <boost/config.hpp>
|
||
|
|
||
|
#include <boost/coroutine/detail/config.hpp>
|
||
|
#include <boost/coroutine/stack_context.hpp>
|
||
|
#include <boost/coroutine/stack_traits.hpp>
|
||
|
|
||
|
#if defined(BOOST_COROUTINES_USE_MAP_STACK)
|
||
|
extern "C" {
|
||
|
#include <sys/mman.h>
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
#ifdef BOOST_HAS_ABI_HEADERS
|
||
|
# include BOOST_ABI_PREFIX
|
||
|
#endif
|
||
|
|
||
|
namespace boost {
|
||
|
namespace coroutines {
|
||
|
|
||
|
template< typename traitsT >
|
||
|
struct basic_standard_stack_allocator
|
||
|
{
|
||
|
typedef traitsT traits_type;
|
||
|
|
||
|
void allocate( stack_context & ctx, std::size_t size = traits_type::minimum_size() )
|
||
|
{
|
||
|
BOOST_ASSERT( traits_type::minimum_size() <= size);
|
||
|
BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= size) );
|
||
|
|
||
|
#if defined(BOOST_COROUTINES_USE_MAP_STACK)
|
||
|
void * limit = ::mmap(0, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | MAP_STACK, -1, 0);
|
||
|
if ( limit == MAP_FAILED ) throw std::bad_alloc();
|
||
|
#else
|
||
|
void * limit = std::malloc( size);
|
||
|
if ( ! limit) throw std::bad_alloc();
|
||
|
#endif
|
||
|
|
||
|
ctx.size = size;
|
||
|
ctx.sp = static_cast< char * >( limit) + ctx.size;
|
||
|
#if defined(BOOST_USE_VALGRIND)
|
||
|
ctx.valgrind_stack_id = VALGRIND_STACK_REGISTER( ctx.sp, limit);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
void deallocate( stack_context & ctx)
|
||
|
{
|
||
|
BOOST_ASSERT( ctx.sp);
|
||
|
BOOST_ASSERT( traits_type::minimum_size() <= ctx.size);
|
||
|
BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= ctx.size) );
|
||
|
|
||
|
#if defined(BOOST_USE_VALGRIND)
|
||
|
VALGRIND_STACK_DEREGISTER( ctx.valgrind_stack_id);
|
||
|
#endif
|
||
|
|
||
|
void * limit = static_cast< char * >( ctx.sp) - ctx.size;
|
||
|
#if defined(BOOST_COROUTINES_USE_MAP_STACK)
|
||
|
munmap(limit, ctx.size);
|
||
|
#else
|
||
|
std::free( limit);
|
||
|
#endif
|
||
|
}
|
||
|
};
|
||
|
|
||
|
typedef basic_standard_stack_allocator< stack_traits > standard_stack_allocator;
|
||
|
|
||
|
}}
|
||
|
|
||
|
#ifdef BOOST_HAS_ABI_HEADERS
|
||
|
# include BOOST_ABI_SUFFIX
|
||
|
#endif
|
||
|
|
||
|
#endif // BOOST_COROUTINES_STANDARD_STACK_ALLOCATOR_H
|