This routine copies the object name from the read-write lock
    object specified by rwlock to the buffer at the location name.
    Before calling this routine, your program must allocate the
    buffer indicated by name.

    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.

    If the specified read-write lock object has not been previously
    set with an object name, this routine copies a C language null
    string into the buffer at location name.