| 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() = 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( i: 1, m: 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( i: 1, m: std::memory_order_release) ) { |
| 47 | std::atomic_thread_fence( m: 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 |
| 60 |