ceph/src/boost/libs/fiber/include/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 //  based on boost::interprocess::sync::interprocess_spin::mutex
   8
   9 #ifndef BOOST_FIBERS_SPINLOCK_H
  10 #define BOOST_FIBERS_SPINLOCK_H
  11
  12 #include <mutex>
  13
  14 #include <boost/fiber/detail/config.hpp>
  15
  16 namespace boost {
  17 namespace fibers {
  18 namespace detail {
  19
  20 struct non_spinlock {
  21     constexpr non_spinlock() noexcept {}
  22     void lock() noexcept {}
  23     void unlock() noexcept {}
  24 };
  25
  26 struct non_lock {
  27     constexpr non_lock( non_spinlock) noexcept {}
  28     void lock() noexcept {}
  29     void unlock() noexcept {}
  30 };
  31
  32 #if ! defined(BOOST_FIBERS_NO_ATOMICS)
  33 typedef std::mutex      spinlock;
  34 using spinlock_lock = std::unique_lock< spinlock >;
  35 #else
  36 typedef non_spinlock    spinlock;
  37 using spinlock_lock = non_lock;
  38 #endif
  39
  40 }}}
  41
  42 #endif // BOOST_FIBERS_SPINLOCK_H