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//
// detail/win_tss_ptr.hpp
// ~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2019 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/config.hpp>
#if defined(BOOST_ASIO_WINDOWS)
#include <boost/asio/detail/noncopyable.hpp>
#include <boost/asio/detail/socket_types.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
// Helper function to create thread-specific storage.
BOOST_ASIO_DECL DWORD win_tss_ptr_create();
template <typename T>
class win_tss_ptr
: private noncopyable
{
public:
// Constructor.
win_tss_ptr()
: tss_key_(win_tss_ptr_create())
{
}
// 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
#include <boost/asio/detail/pop_options.hpp>
#if defined(BOOST_ASIO_HEADER_ONLY)
# include <boost/asio/detail/impl/win_tss_ptr.ipp>
#endif // defined(BOOST_ASIO_HEADER_ONLY)
#endif // defined(BOOST_ASIO_WINDOWS)
#endif // BOOST_ASIO_DETAIL_WIN_TSS_PTR_HPP
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