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/*
* 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)
*
* (C) Copyright 2005-2007 Anthony Williams
* (C) Copyright 2007 David Deakins
* (C) Copyright 2013 Andrey Semashev
*/
/*!
* \file auto_handle.hpp
*
* \brief This header is the Boost.Sync library implementation, see the library documentation
* at http://www.boost.org/doc/libs/release/libs/sync/doc/html/index.html.
*
* This header contains a scope guard to automatically release Windows handles.
*/
#ifndef BOOST_SYNC_DETAIL_AUTO_HANDLE_HPP_INCLUDED_
#define BOOST_SYNC_DETAIL_AUTO_HANDLE_HPP_INCLUDED_
#include <cstddef>
#include <boost/assert.hpp>
#include <boost/detail/winapi/handles.hpp>
#include <boost/detail/winapi/get_last_error.hpp>
#include <boost/detail/winapi/get_current_process.hpp>
#include <boost/sync/detail/config.hpp>
#include <boost/sync/detail/throw_exception.hpp>
#include <boost/sync/exceptions/resource_error.hpp>
#include <boost/sync/detail/header.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
namespace sync {
namespace detail {
namespace windows {
class auto_handle
{
private:
boost::detail::winapi::HANDLE_ m_handle;
public:
BOOST_CONSTEXPR explicit auto_handle(boost::detail::winapi::HANDLE_ h = NULL) BOOST_NOEXCEPT : m_handle(h)
{
}
~auto_handle()
{
reset();
}
void reset(boost::detail::winapi::HANDLE_ h = NULL) BOOST_NOEXCEPT
{
if (m_handle && m_handle != boost::detail::winapi::invalid_handle_value)
{
BOOST_VERIFY(boost::detail::winapi::CloseHandle(m_handle));
}
m_handle = h;
}
boost::detail::winapi::HANDLE_ get() const BOOST_NOEXCEPT
{
return m_handle;
}
operator boost::detail::winapi::HANDLE_ () const BOOST_NOEXCEPT
{
return m_handle;
}
bool operator! () const BOOST_NOEXCEPT
{
return !m_handle;
}
boost::detail::winapi::HANDLE_ release() BOOST_NOEXCEPT
{
const boost::detail::winapi::HANDLE_ h = m_handle;
m_handle = NULL;
return h;
}
boost::detail::winapi::HANDLE_ duplicate() const
{
const boost::detail::winapi::HANDLE_ current_process = boost::detail::winapi::GetCurrentProcess();
boost::detail::winapi::HANDLE_ new_handle = NULL;
if (boost::detail::winapi::DuplicateHandle(current_process, m_handle, current_process, &new_handle, 0, false, boost::detail::winapi::duplicate_same_access) == 0)
{
const boost::detail::winapi::DWORD_ err = boost::detail::winapi::GetLastError();
BOOST_SYNC_DETAIL_THROW(resource_error, (err)("boost::sync: failed to duplicate a handle"));
}
return new_handle;
}
void swap(auto_handle& that)
{
const boost::detail::winapi::HANDLE_ h = m_handle;
m_handle = that.m_handle;
that.m_handle = h;
}
BOOST_DELETED_FUNCTION(auto_handle(auto_handle const&))
BOOST_DELETED_FUNCTION(auto_handle& operator= (auto_handle const&))
};
} // namespace windows
} // namespace detail
} // namespace sync
} // namespace boost
#include <boost/sync/detail/footer.hpp>
#endif // BOOST_SYNC_DETAIL_AUTO_HANDLE_HPP_INCLUDED_
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