boost/asio/detail/win_event.hpp

   1 //
   2 // win_event.hpp
   3 // ~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2008 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_WIN_EVENT_HPP
  12 #define BOOST_ASIO_DETAIL_WIN_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/push_options.hpp>
  19
  20 #include <boost/asio/detail/push_options.hpp>
  21 #include <boost/config.hpp>
  22 #include <boost/system/system_error.hpp>
  23 #include <boost/asio/detail/pop_options.hpp>
  24
  25 #if defined(BOOST_WINDOWS)
  26
  27 #include <boost/asio/error.hpp>
  28 #include <boost/asio/detail/noncopyable.hpp>
  29 #include <boost/asio/detail/socket_types.hpp>
  30
  31 #include <boost/asio/detail/push_options.hpp>
  32 #include <boost/assert.hpp>
  33 #include <boost/throw_exception.hpp>
  34 #include <boost/asio/detail/pop_options.hpp>
  35
  36 namespace boost {
  37 namespace asio {
  38 namespace detail {
  39
  40 class win_event
  41   : private noncopyable
  42 {
  43 public:
  44   // Constructor.
  45   win_event()
  46     : event_(::CreateEvent(0, true, false, 0))
  47   {
  48     if (!event_)
  49     {
  50       DWORD last_error = ::GetLastError();
  51       boost::system::system_error e(
  52           boost::system::error_code(last_error,
  53             boost::asio::error::get_system_category()),
  54           "event");
  55       boost::throw_exception(e);
  56     }
  57   }
  58
  59   // Destructor.
  60   ~win_event()
  61   {
  62     ::CloseHandle(event_);
  63   }
  64
  65   // Signal the event.
  66   template <typename Lock>
  67   void signal(Lock& lock)
  68   {
  69     BOOST_ASSERT(lock.locked());
  70     (void)lock;
  71     ::SetEvent(event_);
  72   }
  73
  74   // Reset the event.
  75   template <typename Lock>
  76   void clear(Lock& lock)
  77   {
  78     BOOST_ASSERT(lock.locked());
  79     (void)lock;
  80     ::ResetEvent(event_);
  81   }
  82
  83   // Wait for the event to become signalled.
  84   template <typename Lock>
  85   void wait(Lock& lock)
  86   {
  87     BOOST_ASSERT(lock.locked());
  88     lock.unlock();
  89     ::WaitForSingleObject(event_, INFINITE);
  90     lock.lock();
  91   }
  92
  93 private:
  94   HANDLE event_;
  95 };
  96
  97 } // namespace detail
  98 } // namespace asio
  99 } // namespace boost
 100
 101 #endif // defined(BOOST_WINDOWS)
 102
 103 #include <boost/asio/detail/pop_options.hpp>
 104
 105 #endif // BOOST_ASIO_DETAIL_WIN_EVENT_HPP