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diff --git a/vendor/icu/src/mutex.h b/vendor/icu/src/mutex.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+******************************************************************************
+*
+*   Copyright (C) 1997-2013, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+******************************************************************************
+*/
+//----------------------------------------------------------------------------
+// File:     mutex.h
+//
+// Lightweight C++ wrapper for umtx_ C mutex functions
+//
+// Author:   Alan Liu  1/31/97
+// History:
+// 06/04/97   helena         Updated setImplementation as per feedback from 5/21 drop.
+// 04/07/1999  srl               refocused as a thin wrapper
+//
+//----------------------------------------------------------------------------
+#ifndef MUTEX_H
+#define MUTEX_H
+
+#include <unicode/utypes.h>
+#include <unicode/uobject.h>
+#include "umutex.h"
+
+U_NAMESPACE_BEGIN
+
+//----------------------------------------------------------------------------
+// Code within that accesses shared static or global data should
+// should instantiate a Mutex object while doing so. You should make your own 
+// private mutex where possible.
+
+// For example:
+// 
+// UMutex myMutex;
+// 
+// void Function(int arg1, int arg2)
+// {
+//    static Object* foo;     // Shared read-write object
+//    Mutex mutex(&myMutex);  // or no args for the global lock
+//    foo->Method();
+//    // When 'mutex' goes out of scope and gets destroyed here, the lock is released
+// }
+//
+// Note:  Do NOT use the form 'Mutex mutex();' as that merely forward-declares a function
+//        returning a Mutex. This is a common mistake which silently slips through the
+//        compiler!!
+//
+
+class U_COMMON_API Mutex : public UMemory {
+public:
+  inline Mutex(UMutex *mutex = NULL);
+  inline ~Mutex();
+
+private:
+  UMutex   *fMutex;
+
+  Mutex(const Mutex &other); // forbid copying of this class
+  Mutex &operator=(const Mutex &other); // forbid copying of this class
+};
+
+inline Mutex::Mutex(UMutex *mutex)
+  : fMutex(mutex)
+{
+  umtx_lock(fMutex);
+}
+
+inline Mutex::~Mutex()
+{
+  umtx_unlock(fMutex);
+}
+
+U_NAMESPACE_END
+
+#endif //_MUTEX_
+//eof