This routine obtains and returns the system-specific status
    value from the status exception object specified in the exception
    argument. This value must have already been associated with the
    exception object using the pthread_exc_set_status_np() routine.

    In a program that uses Threads Library status exceptions, use
    this routine within a CATCH or CATCH_ALL code block to obtain the
    status code value associated with a caught exception. Note that
    any exception objects set to the same status value are considered
    equivalent by the Threads Library.