Imported Upstream version 1.49.0upstream/1.49.0

1 files changed, 92 insertions, 0 deletions

diff --git a/boost/asio/detail/winsock_init.hpp b/boost/asio/detail/winsock_init.hpp
new file mode 100644
index 0000000000..702ba7119a
--- /dev/null
+++ b/boost/asio/detail/winsock_init.hpp
@@ -0,0 +1,92 @@
+//
+// detail/winsock_init.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 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_WINSOCK_INIT_HPP
+#define BOOST_ASIO_DETAIL_WINSOCK_INIT_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_WINDOWS) || defined(__CYGWIN__)
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+class winsock_init_base
+{
+protected:
+  // Structure to track result of initialisation and number of uses. POD is used
+  // to ensure that the values are zero-initialised prior to any code being run.
+  struct data
+  {
+    long init_count_;
+    long result_;
+  };
+
+  BOOST_ASIO_DECL static void startup(data& d,
+      unsigned char major, unsigned char minor);
+
+  BOOST_ASIO_DECL static void cleanup(data& d);
+
+  BOOST_ASIO_DECL static void throw_on_error(data& d);
+};
+
+template <int Major = 2, int Minor = 0>
+class winsock_init : private winsock_init_base
+{
+public:
+  winsock_init(bool allow_throw = true)
+  {
+    startup(data_, Major, Minor);
+    if (allow_throw)
+      throw_on_error(data_);
+  }
+
+  winsock_init(const winsock_init&)
+  {
+    startup(data_, Major, Minor);
+    throw_on_error(data_);
+  }
+
+  ~winsock_init()
+  {
+    cleanup(data_);
+  }
+
+private:
+  static data data_;
+};
+
+template <int Major, int Minor>
+winsock_init_base::data winsock_init<Major, Minor>::data_;
+
+// Static variable to ensure that winsock is initialised before main, and
+// therefore before any other threads can get started.
+static const winsock_init<>& winsock_init_instance = winsock_init<>(false);
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#if defined(BOOST_ASIO_HEADER_ONLY)
+# include <boost/asio/detail/impl/winsock_init.ipp>
+#endif // defined(BOOST_ASIO_HEADER_ONLY)
+
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+#endif // BOOST_ASIO_DETAIL_WINSOCK_INIT_HPP