| // |
| // ssl/detail/openssl_init.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2011 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_SSL_DETAIL_OPENSSL_INIT_HPP |
| #define ASIO_SSL_DETAIL_OPENSSL_INIT_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include "asio/detail/config.hpp" |
| #include <cstring> |
| #include "asio/detail/noncopyable.hpp" |
| #include "asio/detail/shared_ptr.hpp" |
| |
| #include "asio/detail/push_options.hpp" |
| |
| namespace asio { |
| namespace ssl { |
| namespace detail { |
| |
| class openssl_init_base |
| : private noncopyable |
| { |
| protected: |
| // Class that performs the actual initialisation. |
| class do_init; |
| |
| // Helper function to manage a do_init singleton. The static instance of the |
| // openssl_init object ensures that this function is always called before |
| // main, and therefore before any other threads can get started. The do_init |
| // instance must be static in this function to ensure that it gets |
| // initialised before any other global objects try to use it. |
| ASIO_DECL static asio::detail::shared_ptr<do_init> instance(); |
| }; |
| |
| template <bool Do_Init = true> |
| class openssl_init : private openssl_init_base |
| { |
| public: |
| // Constructor. |
| openssl_init() |
| : ref_(instance()) |
| { |
| using namespace std; // For memmove. |
| |
| // Ensure openssl_init::instance_ is linked in. |
| openssl_init* tmp = &instance_; |
| memmove(&tmp, &tmp, sizeof(openssl_init*)); |
| } |
| |
| // Destructor. |
| ~openssl_init() |
| { |
| } |
| |
| private: |
| // Instance to force initialisation of openssl at global scope. |
| static openssl_init instance_; |
| |
| // Reference to singleton do_init object to ensure that openssl does not get |
| // cleaned up until the last user has finished with it. |
| asio::detail::shared_ptr<do_init> ref_; |
| }; |
| |
| template <bool Do_Init> |
| openssl_init<Do_Init> openssl_init<Do_Init>::instance_; |
| |
| } // namespace detail |
| } // namespace ssl |
| } // namespace asio |
| |
| #include "asio/detail/pop_options.hpp" |
| |
| #if defined(ASIO_HEADER_ONLY) |
| # include "asio/ssl/detail/impl/openssl_init.ipp" |
| #endif // defined(ASIO_HEADER_ONLY) |
| |
| #endif // ASIO_SSL_DETAIL_OPENSSL_INIT_HPP |