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diff --git a/boost/log/detail/light_rw_mutex.hpp b/boost/log/detail/light_rw_mutex.hpp
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+++ b/boost/log/detail/light_rw_mutex.hpp
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+/*
+ *          Copyright Andrey Semashev 2007 - 2014.
+ * 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)
+ */
+/*!
+ * \file   light_rw_mutex.hpp
+ * \author Andrey Semashev
+ * \date   24.03.2009
+ *
+ * \brief  This header is the Boost.Log library implementation, see the library documentation
+ *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
+ */
+
+#ifndef BOOST_LOG_DETAIL_LIGHT_RW_MUTEX_HPP_INCLUDED_
+#define BOOST_LOG_DETAIL_LIGHT_RW_MUTEX_HPP_INCLUDED_
+
+#include <boost/log/detail/config.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+#ifndef BOOST_LOG_NO_THREADS
+
+#include <boost/log/detail/header.hpp>
+
+#if defined(BOOST_THREAD_POSIX) // This one can be defined by users, so it should go first
+#define BOOST_LOG_LWRWMUTEX_USE_PTHREAD
+#elif defined(BOOST_WINDOWS) && defined(BOOST_LOG_USE_WINNT6_API)
+#define BOOST_LOG_LWRWMUTEX_USE_SRWLOCK
+#elif defined(BOOST_HAS_PTHREADS)
+#define BOOST_LOG_LWRWMUTEX_USE_PTHREAD
+#endif
+
+#if defined(BOOST_LOG_LWRWMUTEX_USE_SRWLOCK)
+
+#if defined(BOOST_USE_WINDOWS_H)
+
+#ifndef _WIN32_WINNT
+#define _WIN32_WINNT 0x0600 // _WIN32_WINNT_LONGHORN
+#endif
+
+#include <windows.h>
+
+#else // defined(BOOST_USE_WINDOWS_H)
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace aux {
+
+extern "C" {
+
+struct SRWLOCK { void* p; };
+__declspec(dllimport) void __stdcall InitializeSRWLock(SRWLOCK*);
+__declspec(dllimport) void __stdcall ReleaseSRWLockExclusive(SRWLOCK*);
+__declspec(dllimport) void __stdcall ReleaseSRWLockShared(SRWLOCK*);
+__declspec(dllimport) void __stdcall AcquireSRWLockExclusive(SRWLOCK*);
+__declspec(dllimport) void __stdcall AcquireSRWLockShared(SRWLOCK*);
+
+} // extern "C"
+
+} // namespace aux
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#endif // BOOST_USE_WINDOWS_H
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace aux {
+
+//! A light read/write mutex that uses WinNT 6 and later APIs
+class light_rw_mutex
+{
+    SRWLOCK m_Mutex;
+
+public:
+    light_rw_mutex()
+    {
+        InitializeSRWLock(&m_Mutex);
+    }
+    void lock_shared()
+    {
+        AcquireSRWLockShared(&m_Mutex);
+    }
+    void unlock_shared()
+    {
+        ReleaseSRWLockShared(&m_Mutex);
+    }
+    void lock()
+    {
+        AcquireSRWLockExclusive(&m_Mutex);
+    }
+    void unlock()
+    {
+        ReleaseSRWLockExclusive(&m_Mutex);
+    }
+
+    // Noncopyable
+    BOOST_DELETED_FUNCTION(light_rw_mutex(light_rw_mutex const&))
+    BOOST_DELETED_FUNCTION(light_rw_mutex& operator= (light_rw_mutex const&))
+};
+
+} // namespace aux
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#elif defined(BOOST_LOG_LWRWMUTEX_USE_PTHREAD)
+
+#include <pthread.h>
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace aux {
+
+//! A light read/write mutex that maps directly onto POSIX threading library
+class light_rw_mutex
+{
+    pthread_rwlock_t m_Mutex;
+
+public:
+    light_rw_mutex()
+    {
+        pthread_rwlock_init(&m_Mutex, NULL);
+    }
+    ~light_rw_mutex()
+    {
+        pthread_rwlock_destroy(&m_Mutex);
+    }
+    void lock_shared()
+    {
+        pthread_rwlock_rdlock(&m_Mutex);
+    }
+    void unlock_shared()
+    {
+        pthread_rwlock_unlock(&m_Mutex);
+    }
+    void lock()
+    {
+        pthread_rwlock_wrlock(&m_Mutex);
+    }
+    void unlock()
+    {
+        pthread_rwlock_unlock(&m_Mutex);
+    }
+
+    // Noncopyable
+    BOOST_DELETED_FUNCTION(light_rw_mutex(light_rw_mutex const&))
+    BOOST_DELETED_FUNCTION(light_rw_mutex& operator= (light_rw_mutex const&))
+};
+
+} // namespace aux
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#else
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace aux {
+
+//! A light read/write mutex
+class light_rw_mutex
+{
+    struct { void* p; } m_Mutex;
+
+public:
+    BOOST_LOG_API light_rw_mutex();
+    BOOST_LOG_API ~light_rw_mutex();
+    BOOST_LOG_API void lock_shared();
+    BOOST_LOG_API void unlock_shared();
+    BOOST_LOG_API void lock();
+    BOOST_LOG_API void unlock();
+
+    // Noncopyable
+    BOOST_DELETED_FUNCTION(light_rw_mutex(light_rw_mutex const&))
+    BOOST_DELETED_FUNCTION(light_rw_mutex& operator= (light_rw_mutex const&))
+};
+
+} // namespace aux
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#endif
+
+#include <boost/log/detail/footer.hpp>
+
+#endif // BOOST_LOG_NO_THREADS
+
+#endif // BOOST_LOG_DETAIL_LIGHT_RW_MUTEX_HPP_INCLUDED_