ceph/src/boost/boost/leaf/config/tls_globals.hpp

   1 #ifndef BOOST_LEAF_CONFIG_TLS_GLOBALS_HPP_INCLUDED
   2 #define BOOST_LEAF_CONFIG_TLS_GLOBALS_HPP_INCLUDED
   3
   4 // Copyright 2018-2022 Emil Dotchevski and Reverge Studios, Inc.
   5
   6 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   7 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   8
   9 // LEAF requires thread local storage support for pointers and for uin32_t values.
  10
  11 // This header implements "thread local" storage for pointers and for uint32_t
  12 // values using globals, which is suitable for single thread environments.
  13
  14 #include <cstdint>
  15
  16 namespace boost { namespace leaf {
  17
  18 namespace leaf_detail
  19 {
  20     using atomic_unsigned_int = unsigned int;
  21 }
  22
  23 namespace tls
  24 {
  25     template <class T>
  26     struct BOOST_LEAF_SYMBOL_VISIBLE ptr
  27     {
  28         static T * p;
  29     };
  30
  31     template <class T>
  32     T * ptr<T>::p;
  33
  34     template <class T>
  35     T * read_ptr() noexcept
  36     {
  37         return ptr<T>::p;
  38     }
  39
  40     template <class T>
  41     void write_ptr( T * p ) noexcept
  42     {
  43         ptr<T>::p = p;
  44     }
  45
  46     ////////////////////////////////////////
  47
  48     template <class Tag>
  49     struct BOOST_LEAF_SYMBOL_VISIBLE tagged_uint32
  50     {
  51         static std::uint32_t x;
  52     };
  53
  54     template <class Tag>
  55     std::uint32_t tagged_uint32<Tag>::x;
  56
  57     template <class Tag>
  58     std::uint32_t read_uint32() noexcept
  59     {
  60         return tagged_uint32<Tag>::x;
  61     }
  62
  63     template <class Tag>
  64     void write_uint32( std::uint32_t x ) noexcept
  65     {
  66         tagged_uint32<Tag>::x = x;
  67     }
  68
  69     template <class Tag>
  70     void uint32_increment() noexcept
  71     {
  72         ++tagged_uint32<Tag>::x;
  73     }
  74
  75     template <class Tag>
  76     void uint32_decrement() noexcept
  77     {
  78         --tagged_uint32<Tag>::x;
  79     }
  80 }
  81
  82 } }
  83
  84 #endif