| // |
| // win_mutex.hpp |
| // ~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| // |
| |
| #ifndef BOOST_ASIO_DETAIL_WIN_MUTEX_HPP |
| #define BOOST_ASIO_DETAIL_WIN_MUTEX_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include <boost/asio/detail/push_options.hpp> |
| |
| #include <boost/asio/detail/push_options.hpp> |
| #include <boost/config.hpp> |
| #include <boost/system/system_error.hpp> |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #if defined(BOOST_WINDOWS) |
| |
| #include <boost/asio/error.hpp> |
| #include <boost/asio/detail/noncopyable.hpp> |
| #include <boost/asio/detail/socket_types.hpp> |
| #include <boost/asio/detail/scoped_lock.hpp> |
| |
| #include <boost/asio/detail/push_options.hpp> |
| #include <boost/throw_exception.hpp> |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| namespace boost { |
| namespace asio { |
| namespace detail { |
| |
| class win_mutex |
| : private noncopyable |
| { |
| public: |
| typedef boost::asio::detail::scoped_lock<win_mutex> scoped_lock; |
| |
| // Constructor. |
| win_mutex() |
| { |
| int error = do_init(); |
| if (error != 0) |
| { |
| boost::system::system_error e( |
| boost::system::error_code(error, |
| boost::asio::error::get_system_category()), |
| "mutex"); |
| boost::throw_exception(e); |
| } |
| } |
| |
| // Destructor. |
| ~win_mutex() |
| { |
| ::DeleteCriticalSection(&crit_section_); |
| } |
| |
| // Lock the mutex. |
| void lock() |
| { |
| int error = do_lock(); |
| if (error != 0) |
| { |
| boost::system::system_error e( |
| boost::system::error_code(error, |
| boost::asio::error::get_system_category()), |
| "mutex"); |
| boost::throw_exception(e); |
| } |
| } |
| |
| // Unlock the mutex. |
| void unlock() |
| { |
| ::LeaveCriticalSection(&crit_section_); |
| } |
| |
| private: |
| // Initialisation must be performed in a separate function to the constructor |
| // since the compiler does not support the use of structured exceptions and |
| // C++ exceptions in the same function. |
| int do_init() |
| { |
| #if defined(__MINGW32__) |
| // Not sure if MinGW supports structured exception handling, so for now |
| // we'll just call the Windows API and hope. |
| ::InitializeCriticalSection(&crit_section_); |
| return 0; |
| #else |
| __try |
| { |
| ::InitializeCriticalSection(&crit_section_); |
| } |
| __except(GetExceptionCode() == STATUS_NO_MEMORY |
| ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) |
| { |
| return ERROR_OUTOFMEMORY; |
| } |
| |
| return 0; |
| #endif |
| } |
| |
| // Locking must be performed in a separate function to lock() since the |
| // compiler does not support the use of structured exceptions and C++ |
| // exceptions in the same function. |
| int do_lock() |
| { |
| #if defined(__MINGW32__) |
| // Not sure if MinGW supports structured exception handling, so for now |
| // we'll just call the Windows API and hope. |
| ::EnterCriticalSection(&crit_section_); |
| return 0; |
| #else |
| __try |
| { |
| ::EnterCriticalSection(&crit_section_); |
| } |
| __except(GetExceptionCode() == STATUS_INVALID_HANDLE |
| || GetExceptionCode() == STATUS_NO_MEMORY |
| ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) |
| { |
| if (GetExceptionCode() == STATUS_NO_MEMORY) |
| return ERROR_OUTOFMEMORY; |
| return ERROR_INVALID_HANDLE; |
| } |
| |
| return 0; |
| #endif |
| } |
| |
| ::CRITICAL_SECTION crit_section_; |
| }; |
| |
| } // namespace detail |
| } // namespace asio |
| } // namespace boost |
| |
| #endif // defined(BOOST_WINDOWS) |
| |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #endif // BOOST_ASIO_DETAIL_WIN_MUTEX_HPP |