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//
// 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
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