ceph/src/boost/boost/fiber/detail/fss.hpp

   1
   2 //          Copyright Oliver Kowalke 2013.
   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 //          based on tss.hpp from boost.thread
   8
   9 #ifndef BOOST_FIBERS_DETAIL_FSS_H
  10 #define BOOST_FIBERS_DETAIL_FSS_H
  11
  12 #include <atomic>
  13 #include <cstddef>
  14
  15 #include <boost/config.hpp>
  16 #include <boost/intrusive_ptr.hpp>
  17
  18 #ifdef BOOST_HAS_ABI_HEADERS
  19 #  include BOOST_ABI_PREFIX
  20 #endif
  21
  22 namespace boost {
  23 namespace fibers {
  24 namespace detail {
  25
  26 class fss_cleanup_function {
  27 private:
  28     std::atomic< std::size_t >  use_count_{ 0 };
  29
  30 public:
  31     typedef intrusive_ptr< fss_cleanup_function >   ptr_t;
  32
  33     fss_cleanup_function() noexcept = default;
  34
  35     virtual ~fss_cleanup_function() = default;
  36
  37     virtual void operator()( void * data) = 0;
  38
  39     friend inline
  40     void intrusive_ptr_add_ref( fss_cleanup_function * p) noexcept {
  41         p->use_count_.fetch_add( 1, std::memory_order_relaxed);
  42     }
  43
  44     friend inline
  45     void intrusive_ptr_release( fss_cleanup_function * p) noexcept {
  46         if ( 1 == p->use_count_.fetch_sub( 1, std::memory_order_release) ) {
  47             std::atomic_thread_fence( std::memory_order_acquire);
  48             delete p;
  49         }
  50     }
  51 };
  52
  53 }}}
  54
  55 #ifdef BOOST_HAS_ABI_HEADERS
  56 #  include BOOST_ABI_SUFFIX
  57 #endif
  58
  59 #endif //  BOOST_FIBERS_DETAIL_FSS_H