VMS Help  —  POSIX Threads, PTHREAD routines, pthread_mutex_setname_np, Description
    This routine changes the object name in the mutex object
    specified by the mutex argument to the value specified by the
    name argument. To set a new mutex object's object name, call this
    routine immediately after initializing the mutex object.

    The object name is a C language string and provides an identifier
    that is meaningful to a person debugging a multithreaded
    application. The maximum number of characters in the object name
    is 31.
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