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diff --git a/lib/asio/detail/posix_mutex.hpp b/lib/asio/detail/posix_mutex.hpp
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+++ b/lib/asio/detail/posix_mutex.hpp
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+//
+// detail/posix_mutex.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 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_DETAIL_POSIX_MUTEX_HPP
+#define ASIO_DETAIL_POSIX_MUTEX_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(ASIO_HAS_PTHREADS)
+
+#include <pthread.h>
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/scoped_lock.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class posix_event;
+
+class posix_mutex
+  : private noncopyable
+{
+public:
+  typedef asio::detail::scoped_lock<posix_mutex> scoped_lock;
+
+  // Constructor.
+  ASIO_DECL posix_mutex();
+
+  // Destructor.
+  ~posix_mutex()
+  {
+    ::pthread_mutex_destroy(&mutex_); // Ignore EBUSY.
+  }
+
+  // Lock the mutex.
+  void lock()
+  {
+    (void)::pthread_mutex_lock(&mutex_); // Ignore EINVAL.
+  }
+
+  // Unlock the mutex.
+  void unlock()
+  {
+    (void)::pthread_mutex_unlock(&mutex_); // Ignore EINVAL.
+  }
+
+private:
+  friend class posix_event;
+  ::pthread_mutex_t mutex_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/detail/impl/posix_mutex.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // defined(ASIO_HAS_PTHREADS)
+
+#endif // ASIO_DETAIL_POSIX_MUTEX_HPP