asio/detail/win_mutex.hpp

0001 //
0002 // detail/win_mutex.hpp
0003 // ~~~~~~~~~~~~~~~~~~~~
0004 //
0005 // Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
0006 //
0007 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0008 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0009 //
0010
0011 #ifndef BOOST_ASIO_DETAIL_WIN_MUTEX_HPP
0012 #define BOOST_ASIO_DETAIL_WIN_MUTEX_HPP
0013
0014 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
0015 # pragma once
0016 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
0017
0018 #include <boost/asio/detail/config.hpp>
0019
0020 #if defined(BOOST_ASIO_WINDOWS)
0021
0022 #include <boost/asio/detail/noncopyable.hpp>
0023 #include <boost/asio/detail/scoped_lock.hpp>
0024 #include <boost/asio/detail/socket_types.hpp>
0025
0026 #include <boost/asio/detail/push_options.hpp>
0027
0028 namespace boost {
0029 namespace asio {
0030 namespace detail {
0031
0032 class win_mutex
0033   : private noncopyable
0034 {
0035 public:
0036   typedef boost::asio::detail::scoped_lock<win_mutex> scoped_lock;
0037
0038   // Constructor.
0039   BOOST_ASIO_DECL win_mutex();
0040
0041   // Destructor.
0042   ~win_mutex()
0043   {
0044     ::DeleteCriticalSection(&crit_section_);
0045   }
0046
0047   // Try to lock the mutex.
0048   bool try_lock()
0049   {
0050     return ::TryEnterCriticalSection(&crit_section_) != 0;
0051   }
0052
0053   // Lock the mutex.
0054   void lock()
0055   {
0056     ::EnterCriticalSection(&crit_section_);
0057   }
0058
0059   // Unlock the mutex.
0060   void unlock()
0061   {
0062     ::LeaveCriticalSection(&crit_section_);
0063   }
0064
0065 private:
0066   // Initialisation must be performed in a separate function to the constructor
0067   // since the compiler does not support the use of structured exceptions and
0068   // C++ exceptions in the same function.
0069   BOOST_ASIO_DECL int do_init();
0070
0071   ::CRITICAL_SECTION crit_section_;
0072 };
0073
0074 } // namespace detail
0075 } // namespace asio
0076 } // namespace boost
0077
0078 #include <boost/asio/detail/pop_options.hpp>
0079
0080 #if defined(BOOST_ASIO_HEADER_ONLY)
0081 # include <boost/asio/detail/impl/win_mutex.ipp>
0082 #endif // defined(BOOST_ASIO_HEADER_ONLY)
0083
0084 #endif // defined(BOOST_ASIO_WINDOWS)
0085
0086 #endif // BOOST_ASIO_DETAIL_WIN_MUTEX_HPP