ceph/src/boost/libs/coroutine/include/boost/coroutine/standard_stack_allocator.hpp

   1
   2 //          Copyright Oliver Kowalke 2009.
   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)
   6
   7 #ifndef BOOST_COROUTINES_STANDARD_STACK_ALLOCATOR_H
   8 #define BOOST_COROUTINES_STANDARD_STACK_ALLOCATOR_H
   9
  10 #if defined(BOOST_USE_VALGRIND)
  11 #include <valgrind/valgrind.h>
  12 #endif
  13
  14 #include <cstddef>
  15 #include <cstdlib>
  16 #include <new>
  17
  18 #include <boost/assert.hpp>
  19 #include <boost/config.hpp>
  20
  21 #include <boost/coroutine/detail/config.hpp>
  22 #include <boost/coroutine/stack_context.hpp>
  23 #include <boost/coroutine/stack_traits.hpp>
  24
  25 #ifdef BOOST_HAS_ABI_HEADERS
  26 #  include BOOST_ABI_PREFIX
  27 #endif
  28
  29 namespace boost {
  30 namespace coroutines {
  31
  32 template< typename traitsT >
  33 struct basic_standard_stack_allocator
  34 {
  35     typedef traitsT traits_type;
  36
  37     void allocate( stack_context & ctx, std::size_t size = traits_type::minimum_size() )
  38     {
  39         BOOST_ASSERT( traits_type::minimum_size() <= size);
  40         BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= size) );
  41
  42         void * limit = std::malloc( size);
  43         if ( ! limit) throw std::bad_alloc();
  44
  45         ctx.size = size;
  46         ctx.sp = static_cast< char * >( limit) + ctx.size;
  47 #if defined(BOOST_USE_VALGRIND)
  48         ctx.valgrind_stack_id = VALGRIND_STACK_REGISTER( ctx.sp, limit);
  49 #endif
  50     }
  51
  52     void deallocate( stack_context & ctx)
  53     {
  54         BOOST_ASSERT( ctx.sp);
  55         BOOST_ASSERT( traits_type::minimum_size() <= ctx.size);
  56         BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= ctx.size) );
  57
  58 #if defined(BOOST_USE_VALGRIND)
  59         VALGRIND_STACK_DEREGISTER( ctx.valgrind_stack_id);
  60 #endif
  61
  62         void * limit = static_cast< char * >( ctx.sp) - ctx.size;
  63         std::free( limit);
  64     }
  65 };
  66
  67 typedef basic_standard_stack_allocator< stack_traits >  standard_stack_allocator;
  68
  69 }}
  70
  71 #ifdef BOOST_HAS_ABI_HEADERS
  72 #  include BOOST_ABI_SUFFIX
  73 #endif
  74
  75 #endif // BOOST_COROUTINES_STANDARD_STACK_ALLOCATOR_H