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88 lines
2.4 KiB
88 lines
2.4 KiB
// |
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// ssl/detail/openssl_init.hpp |
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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// |
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// Copyright (c) 2003-2011 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 BOOST_ASIO_SSL_DETAIL_OPENSSL_INIT_HPP |
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#define BOOST_ASIO_SSL_DETAIL_OPENSSL_INIT_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 <boost/asio/detail/config.hpp> |
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#include <cstring> |
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#include <boost/asio/detail/noncopyable.hpp> |
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#include <boost/asio/detail/shared_ptr.hpp> |
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#include <boost/asio/detail/push_options.hpp> |
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namespace boost { |
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namespace asio { |
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namespace ssl { |
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namespace detail { |
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class openssl_init_base |
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: private noncopyable |
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{ |
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protected: |
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// Class that performs the actual initialisation. |
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class do_init; |
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// Helper function to manage a do_init singleton. The static instance of the |
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// openssl_init object ensures that this function is always called before |
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// main, and therefore before any other threads can get started. The do_init |
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// instance must be static in this function to ensure that it gets |
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// initialised before any other global objects try to use it. |
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BOOST_ASIO_DECL static boost::asio::detail::shared_ptr<do_init> instance(); |
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}; |
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template <bool Do_Init = true> |
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class openssl_init : private openssl_init_base |
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{ |
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public: |
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// Constructor. |
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openssl_init() |
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: ref_(instance()) |
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{ |
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using namespace std; // For memmove. |
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// Ensure openssl_init::instance_ is linked in. |
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openssl_init* tmp = &instance_; |
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memmove(&tmp, &tmp, sizeof(openssl_init*)); |
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} |
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// Destructor. |
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~openssl_init() |
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{ |
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} |
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private: |
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// Instance to force initialisation of openssl at global scope. |
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static openssl_init instance_; |
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// Reference to singleton do_init object to ensure that openssl does not get |
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// cleaned up until the last user has finished with it. |
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boost::asio::detail::shared_ptr<do_init> ref_; |
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}; |
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template <bool Do_Init> |
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openssl_init<Do_Init> openssl_init<Do_Init>::instance_; |
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} // namespace detail |
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} // namespace ssl |
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} // namespace asio |
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} // namespace boost |
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#include <boost/asio/detail/pop_options.hpp> |
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#if defined(BOOST_ASIO_HEADER_ONLY) |
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# include <boost/asio/ssl/detail/impl/openssl_init.ipp> |
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#endif // defined(BOOST_ASIO_HEADER_ONLY) |
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#endif // BOOST_ASIO_SSL_DETAIL_OPENSSL_INIT_HPP
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