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//
// win_tss_ptr.hpp
// ~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2010 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_TSS_PTR_HPP
#define BOOST_ASIO_DETAIL_WIN_TSS_PTR_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/push_options.hpp>
#include <boost/throw_exception.hpp>
#include <boost/asio/detail/pop_options.hpp>
namespace boost {
namespace asio {
namespace detail {
template <typename T>
class win_tss_ptr
: private noncopyable
{
public:
#if defined(UNDER_CE)
enum { out_of_indexes = 0xFFFFFFFF };
#else
enum { out_of_indexes = TLS_OUT_OF_INDEXES };
#endif
// Constructor.
win_tss_ptr()
{
tss_key_ = ::TlsAlloc();
if (tss_key_ == out_of_indexes)
{
DWORD last_error = ::GetLastError();
boost::system::system_error e(
boost::system::error_code(last_error,
boost::asio::error::get_system_category()),
"tss");
boost::throw_exception(e);
}
}
// Destructor.
~win_tss_ptr()
{
::TlsFree(tss_key_);
}
// Get the value.
operator T*() const
{
return static_cast<T*>(::TlsGetValue(tss_key_));
}
// Set the value.
void operator=(T* value)
{
::TlsSetValue(tss_key_, value);
}
private:
// Thread-specific storage to allow unlocked access to determine whether a
// thread is a member of the pool.
DWORD tss_key_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#endif // defined(BOOST_WINDOWS)
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_WIN_TSS_PTR_HPP
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