91 lines
2.4 KiB
C++
Executable File
91 lines
2.4 KiB
C++
Executable File
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// Copyright Oliver Kowalke 2009.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_COROUTINES_STANDARD_STACK_ALLOCATOR_H
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#define BOOST_COROUTINES_STANDARD_STACK_ALLOCATOR_H
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#if defined(BOOST_USE_VALGRIND)
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#include <valgrind/valgrind.h>
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#endif
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#include <cstddef>
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#include <cstdlib>
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#include <new>
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#include <boost/assert.hpp>
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#include <boost/config.hpp>
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#include <boost/coroutine/detail/config.hpp>
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#include <boost/coroutine/stack_context.hpp>
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#include <boost/coroutine/stack_traits.hpp>
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#if defined(BOOST_COROUTINES_USE_MAP_STACK)
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extern "C" {
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#include <sys/mman.h>
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}
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#endif
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_PREFIX
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#endif
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namespace boost {
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namespace coroutines {
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template< typename traitsT >
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struct basic_standard_stack_allocator
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{
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typedef traitsT traits_type;
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void allocate( stack_context & ctx, std::size_t size = traits_type::minimum_size() )
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{
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BOOST_ASSERT( traits_type::minimum_size() <= size);
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BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= size) );
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#if defined(BOOST_COROUTINES_USE_MAP_STACK)
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void * limit = ::mmap(0, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | MAP_STACK, -1, 0);
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if ( limit == MAP_FAILED ) throw std::bad_alloc();
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#else
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void * limit = std::malloc( size);
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if ( ! limit) throw std::bad_alloc();
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#endif
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ctx.size = size;
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ctx.sp = static_cast< char * >( limit) + ctx.size;
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#if defined(BOOST_USE_VALGRIND)
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ctx.valgrind_stack_id = VALGRIND_STACK_REGISTER( ctx.sp, limit);
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#endif
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}
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void deallocate( stack_context & ctx)
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{
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BOOST_ASSERT( ctx.sp);
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BOOST_ASSERT( traits_type::minimum_size() <= ctx.size);
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BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= ctx.size) );
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#if defined(BOOST_USE_VALGRIND)
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VALGRIND_STACK_DEREGISTER( ctx.valgrind_stack_id);
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#endif
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void * limit = static_cast< char * >( ctx.sp) - ctx.size;
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#if defined(BOOST_COROUTINES_USE_MAP_STACK)
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munmap(limit, ctx.size);
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#else
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std::free( limit);
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#endif
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}
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};
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typedef basic_standard_stack_allocator< stack_traits > standard_stack_allocator;
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}}
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_SUFFIX
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#endif
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#endif // BOOST_COROUTINES_STANDARD_STACK_ALLOCATOR_H
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