ceph/src/boost/libs/asio/include/boost/asio/detail/null_event.hpp

   1 //
   2 // detail/null_event.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef BOOST_ASIO_DETAIL_NULL_EVENT_HPP
  12 #define BOOST_ASIO_DETAIL_NULL_EVENT_HPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  17
  18 #include <boost/asio/detail/config.hpp>
  19
  20 #if !defined(BOOST_ASIO_HAS_THREADS)
  21
  22 #include <boost/asio/detail/noncopyable.hpp>
  23
  24 #include <boost/asio/detail/push_options.hpp>
  25
  26 namespace boost {
  27 namespace asio {
  28 namespace detail {
  29
  30 class null_event
  31   : private noncopyable
  32 {
  33 public:
  34   // Constructor.
  35   null_event()
  36   {
  37   }
  38
  39   // Destructor.
  40   ~null_event()
  41   {
  42   }
  43
  44   // Signal the event. (Retained for backward compatibility.)
  45   template <typename Lock>
  46   void signal(Lock&)
  47   {
  48   }
  49
  50   // Signal all waiters.
  51   template <typename Lock>
  52   void signal_all(Lock&)
  53   {
  54   }
  55
  56   // Unlock the mutex and signal one waiter.
  57   template <typename Lock>
  58   void unlock_and_signal_one(Lock&)
  59   {
  60   }
  61
  62   // If there's a waiter, unlock the mutex and signal it.
  63   template <typename Lock>
  64   bool maybe_unlock_and_signal_one(Lock&)
  65   {
  66     return false;
  67   }
  68
  69   // Reset the event.
  70   template <typename Lock>
  71   void clear(Lock&)
  72   {
  73   }
  74
  75   // Wait for the event to become signalled.
  76   template <typename Lock>
  77   void wait(Lock&)
  78   {
  79   }
  80 };
  81
  82 } // namespace detail
  83 } // namespace asio
  84 } // namespace boost
  85
  86 #include <boost/asio/detail/pop_options.hpp>
  87
  88 #endif // !defined(BOOST_ASIO_HAS_THREADS)
  89
  90 #endif // BOOST_ASIO_DETAIL_NULL_EVENT_HPP