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diff --git a/boost/asio/detail/impl/posix_thread.ipp b/boost/asio/detail/impl/posix_thread.ipp
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+++ b/boost/asio/detail/impl/posix_thread.ipp
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+//
+// detail/impl/posix_thread.ipp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// 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_IMPL_POSIX_THREAD_IPP
+#define BOOST_ASIO_DETAIL_IMPL_POSIX_THREAD_IPP
+
+#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_HAS_PTHREADS) && !defined(BOOST_ASIO_DISABLE_THREADS)
+
+#include <boost/asio/detail/posix_thread.hpp>
+#include <boost/asio/detail/throw_error.hpp>
+#include <boost/asio/error.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+posix_thread::~posix_thread()
+{
+  if (!joined_)
+    ::pthread_detach(thread_);
+}
+
+void posix_thread::join()
+{
+  if (!joined_)
+  {
+    ::pthread_join(thread_, 0);
+    joined_ = true;
+  }
+}
+
+void posix_thread::start_thread(func_base* arg)
+{
+  int error = ::pthread_create(&thread_, 0,
+        boost_asio_detail_posix_thread_function, arg);
+  if (error != 0)
+  {
+    delete arg;
+    boost::system::error_code ec(error,
+        boost::asio::error::get_system_category());
+    boost::asio::detail::throw_error(ec, "thread");
+  }
+}
+
+void* boost_asio_detail_posix_thread_function(void* arg)
+{
+  posix_thread::auto_func_base_ptr func = {
+      static_cast<posix_thread::func_base*>(arg) };
+  func.ptr->run();
+  return 0;
+}
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // defined(BOOST_HAS_PTHREADS) && !defined(BOOST_ASIO_DISABLE_THREADS)
+
+#endif // BOOST_ASIO_DETAIL_IMPL_POSIX_THREAD_IPP