diff options
Diffstat (limited to '3rdparty/asio/include/asio/detail/atomic_count.hpp')
-rw-r--r-- | 3rdparty/asio/include/asio/detail/atomic_count.hpp | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/3rdparty/asio/include/asio/detail/atomic_count.hpp b/3rdparty/asio/include/asio/detail/atomic_count.hpp index 798f9150097..8409298a9af 100644 --- a/3rdparty/asio/include/asio/detail/atomic_count.hpp +++ b/3rdparty/asio/include/asio/detail/atomic_count.hpp @@ -2,7 +2,7 @@ // detail/atomic_count.hpp // ~~~~~~~~~~~~~~~~~~~~~~~ // -// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com) +// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com) // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) @@ -31,12 +31,31 @@ namespace detail { #if !defined(ASIO_HAS_THREADS) typedef long atomic_count; inline void increment(atomic_count& a, long b) { a += b; } +inline void ref_count_up(atomic_count& a) { ++a; } +inline bool ref_count_down(atomic_count& a) { return --a == 0; } #elif defined(ASIO_HAS_STD_ATOMIC) typedef std::atomic<long> atomic_count; inline void increment(atomic_count& a, long b) { a += b; } + +inline void ref_count_up(atomic_count& a) +{ + a.fetch_add(1, std::memory_order_relaxed); +} + +inline bool ref_count_down(atomic_count& a) +{ + if (a.fetch_sub(1, std::memory_order_release) == 1) + { + std::atomic_thread_fence(std::memory_order_acquire); + return true; + } + return false; +} #else // defined(ASIO_HAS_STD_ATOMIC) typedef boost::detail::atomic_count atomic_count; inline void increment(atomic_count& a, long b) { while (b > 0) ++a, --b; } +inline void ref_count_up(atomic_count& a) { ++a; } +inline bool ref_count_down(atomic_count& a) { return --a == 0; } #endif // defined(ASIO_HAS_STD_ATOMIC) } // namespace detail |