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