ceph/src/boost/libs/thread/include/boost/thread/reverse_lock.hpp

   1 // Distributed under the Boost Software License, Version 1.0. (See
   2 // accompanying file LICENSE_1_0.txt or copy at
   3 // http://www.boost.org/LICENSE_1_0.txt)
   4 // (C) Copyright 2012 Vicente J. Botet Escriba
   5
   6 #ifndef BOOST_THREAD_REVERSE_LOCK_HPP
   7 #define BOOST_THREAD_REVERSE_LOCK_HPP
   8 #include <boost/thread/detail/config.hpp>
   9 #include <boost/thread/detail/move.hpp>
  10 #include <boost/thread/lockable_traits.hpp>
  11 #include <boost/thread/lock_options.hpp>
  12 #include <boost/thread/detail/delete.hpp>
  13
  14 namespace boost
  15 {
  16
  17     template<typename Lock>
  18     class reverse_lock
  19     {
  20     public:
  21         typedef typename Lock::mutex_type mutex_type;
  22         BOOST_THREAD_NO_COPYABLE(reverse_lock)
  23
  24         explicit reverse_lock(Lock& m_)
  25         : m(m_), mtx(0)
  26         {
  27             if (m.owns_lock())
  28             {
  29               m.unlock();
  30             }
  31             mtx=m.release();
  32         }
  33         ~reverse_lock()
  34         {
  35           if (mtx) {
  36             mtx->lock();
  37             m = BOOST_THREAD_MAKE_RV_REF(Lock(*mtx, adopt_lock));
  38           }
  39         }
  40
  41     private:
  42       Lock& m;
  43       mutex_type* mtx;
  44     };
  45
  46
  47 #ifdef BOOST_THREAD_NO_AUTO_DETECT_MUTEX_TYPES
  48     template<typename T>
  49     struct is_mutex_type<reverse_lock<T> >
  50     {
  51         BOOST_STATIC_CONSTANT(bool, value = true);
  52     };
  53
  54 #endif
  55
  56
  57 }
  58
  59 #endif // header