81 lines
1.7 KiB
C++
81 lines
1.7 KiB
C++
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//
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// detail/posix_global.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_POSIX_GLOBAL_HPP
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#define ASIO_DETAIL_POSIX_GLOBAL_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#if defined(ASIO_HAS_PTHREADS)
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#include <exception>
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#include <pthread.h>
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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template <typename T>
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struct posix_global_impl
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{
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// Helper function to perform initialisation.
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static void do_init()
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{
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instance_.static_ptr_ = instance_.ptr_ = new T;
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}
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// Destructor automatically cleans up the global.
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~posix_global_impl()
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{
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delete static_ptr_;
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}
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static ::pthread_once_t init_once_;
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static T* static_ptr_;
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static posix_global_impl instance_;
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T* ptr_;
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};
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template <typename T>
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::pthread_once_t posix_global_impl<T>::init_once_ = PTHREAD_ONCE_INIT;
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template <typename T>
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T* posix_global_impl<T>::static_ptr_ = 0;
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template <typename T>
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posix_global_impl<T> posix_global_impl<T>::instance_;
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template <typename T>
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T& posix_global()
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{
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int result = ::pthread_once(
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&posix_global_impl<T>::init_once_,
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&posix_global_impl<T>::do_init);
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if (result != 0)
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std::terminate();
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return *posix_global_impl<T>::instance_.ptr_;
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}
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // defined(ASIO_HAS_PTHREADS)
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#endif // ASIO_DETAIL_POSIX_GLOBAL_HPP
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