ceph/src/boost/boost/fiber/detail/spinlock.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 #ifndef BOOST_FIBERS_SPINLOCK_H
   8 #define BOOST_FIBERS_SPINLOCK_H
   9
  10 #include <boost/config.hpp>
  11
  12 #include <boost/fiber/detail/config.hpp>
  13
  14 #if !defined(BOOST_FIBERS_NO_ATOMICS)
  15 # include <mutex>
  16 # include <boost/fiber/detail/spinlock_ttas_adaptive.hpp>
  17 # include <boost/fiber/detail/spinlock_ttas.hpp>
  18 # if defined(BOOST_FIBERS_HAS_FUTEX)
  19 #  include <boost/fiber/detail/spinlock_ttas_adaptive_futex.hpp>
  20 #  include <boost/fiber/detail/spinlock_ttas_futex.hpp>
  21 # endif
  22 # if defined(BOOST_USE_TSX)
  23 #  include <boost/fiber/detail/spinlock_rtm.hpp>
  24 # endif
  25 #endif
  26
  27 #ifdef BOOST_HAS_ABI_HEADERS
  28 #  include BOOST_ABI_PREFIX
  29 #endif
  30
  31 namespace boost {
  32 namespace fibers {
  33 namespace detail {
  34
  35 #if defined(BOOST_FIBERS_NO_ATOMICS)
  36 struct spinlock {
  37     constexpr spinlock() noexcept {}
  38     void lock() noexcept {}
  39     void unlock() noexcept {}
  40 };
  41
  42 struct spinlock_lock {
  43     constexpr spinlock_lock( spinlock &) noexcept {}
  44     void lock() noexcept {}
  45     void unlock() noexcept {}
  46 };
  47 #else
  48 # if defined(BOOST_FIBERS_SPINLOCK_STD_MUTEX)
  49 using spinlock = std::mutex;
  50 # elif defined(BOOST_FIBERS_SPINLOCK_TTAS_FUTEX)
  51 #  if defined(BOOST_USE_TSX)
  52 using spinlock = spinlock_rtm< spinlock_ttas_futex >;
  53 #  else
  54 using spinlock = spinlock_ttas_futex;
  55 #  endif
  56 # elif defined(BOOST_FIBERS_SPINLOCK_TTAS_ADAPTIVE_FUTEX)
  57 #  if defined(BOOST_USE_TSX)
  58 using spinlock = spinlock_rtm< spinlock_ttas_adaptive_futex >;
  59 #  else
  60 using spinlock = spinlock_ttas_adaptive_futex;
  61 #  endif
  62 # elif defined(BOOST_FIBERS_SPINLOCK_TTAS_ADAPTIVE)
  63 #  if defined(BOOST_USE_TSX)
  64 using spinlock = spinlock_rtm< spinlock_ttas_adaptive >;
  65 #  else
  66 using spinlock = spinlock_ttas_adaptive;
  67 #  endif
  68 # else
  69 #  if defined(BOOST_USE_TSX)
  70 using spinlock = spinlock_rtm< spinlock_ttas >;
  71 #  else
  72 using spinlock = spinlock_ttas;
  73 #  endif
  74 # endif
  75 using spinlock_lock = std::unique_lock< spinlock >;
  76 #endif
  77
  78 }}}
  79
  80 #ifdef BOOST_HAS_ABI_HEADERS
  81 #  include BOOST_ABI_SUFFIX
  82 #endif
  83
  84 #endif // BOOST_FIBERS_SPINLOCK_H