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//
// detail/posix_tss_ptr.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 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 ASIO_DETAIL_POSIX_TSS_PTR_HPP
#define ASIO_DETAIL_POSIX_TSS_PTR_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#if defined(ASIO_HAS_PTHREADS)
#include <pthread.h>
#include "asio/detail/noncopyable.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
// Helper function to create thread-specific storage.
ASIO_DECL void posix_tss_ptr_create(pthread_key_t& key);
template <typename T>
class posix_tss_ptr
: private noncopyable
{
public:
// Constructor.
posix_tss_ptr()
{
posix_tss_ptr_create(tss_key_);
}
// Destructor.
~posix_tss_ptr()
{
::pthread_key_delete(tss_key_);
}
// Get the value.
operator T*() const
{
return static_cast<T*>(::pthread_getspecific(tss_key_));
}
// Set the value.
void operator=(T* value)
{
::pthread_setspecific(tss_key_, value);
}
private:
// Thread-specific storage to allow unlocked access to determine whether a
// thread is a member of the pool.
pthread_key_t tss_key_;
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#if defined(ASIO_HEADER_ONLY)
# include "asio/detail/impl/posix_tss_ptr.ipp"
#endif // defined(ASIO_HEADER_ONLY)
#endif // defined(ASIO_HAS_PTHREADS)
#endif // ASIO_DETAIL_POSIX_TSS_PTR_HPP
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