ceph/src/boost/boost/context/fixedsize_stack.hpp

   1
   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)
   6
   7 #ifndef BOOST_CONTEXT_FIXEDSIZE_H
   8 #define BOOST_CONTEXT_FIXEDSIZE_H
   9
  10 #include <cstddef>
  11 #include <cstdlib>
  12 #include <new>
  13
  14 #include <boost/assert.hpp>
  15 #include <boost/config.hpp>
  16
  17 #include <boost/context/detail/config.hpp>
  18 #include <boost/context/stack_context.hpp>
  19 #include <boost/context/stack_traits.hpp>
  20
  21 #if defined(BOOST_USE_VALGRIND)
  22 #include <valgrind/valgrind.h>
  23 #endif
  24
  25 #ifdef BOOST_HAS_ABI_HEADERS
  26 #  include BOOST_ABI_PREFIX
  27 #endif
  28
  29 namespace boost {
  30 namespace context {
  31
  32 template< typename traitsT >
  33 class basic_fixedsize_stack {
  34 private:
  35     std::size_t     size_;
  36
  37 public:
  38     typedef traitsT traits_type;
  39
  40     basic_fixedsize_stack( std::size_t size = traits_type::default_size() ) BOOST_NOEXCEPT_OR_NOTHROW :
  41         size_( size) {
  42     }
  43
  44     stack_context allocate() {
  45         void * vp = std::malloc( size_);
  46         if ( ! vp) {
  47             throw std::bad_alloc();
  48         }
  49         stack_context sctx;
  50         sctx.size = size_;
  51         sctx.sp = static_cast< char * >( vp) + sctx.size;
  52 #if defined(BOOST_USE_VALGRIND)
  53         sctx.valgrind_stack_id = VALGRIND_STACK_REGISTER( sctx.sp, vp);
  54 #endif
  55         return sctx;
  56     }
  57
  58     void deallocate( stack_context & sctx) BOOST_NOEXCEPT_OR_NOTHROW {
  59         BOOST_ASSERT( sctx.sp);
  60
  61 #if defined(BOOST_USE_VALGRIND)
  62         VALGRIND_STACK_DEREGISTER( sctx.valgrind_stack_id);
  63 #endif
  64         void * vp = static_cast< char * >( sctx.sp) - sctx.size;
  65         std::free( vp);
  66     }
  67 };
  68
  69 typedef basic_fixedsize_stack< stack_traits >  fixedsize_stack;
  70 # if ! defined(BOOST_USE_SEGMENTED_STACKS)
  71 typedef fixedsize_stack default_stack;
  72 # endif
  73
  74 }}
  75
  76 #ifdef BOOST_HAS_ABI_HEADERS
  77 #  include BOOST_ABI_SUFFIX
  78 #endif
  79
  80 #endif // BOOST_CONTEXT_FIXEDSIZE_H