On Alpha and Integrity server systems, writes all modified pages
    in an active private or global disk file section back into the
    section file on disk. Zero or more I/O requests are queued, based
    on the number of pages that have been modified.

    The $UPDSEC_64W service completes synchronously; that is, it
    returns to the caller after writing all updated pages.

    In all other respects, $UPDSEC_64W is identical to $UPDSEC_64.
    For additional information about the $UPDSEC_64W service, see the
    help for $UPDSEC_64.

    This service accepts 64-bit addresses.

    Format

      SYS$UPDSEC_64W  start_va_64 ,length_64 ,acmode ,updflg ,efn

                      ,iosa_64 ,return_va_64 ,return_length_64

                      [,astadr_64 [,astprm_64]]

    C Prototype

      int sys$updsec_64w  (void *start_va_64, unsigned __int64

                          length_64, unsigned int acmode, unsigned

                          int updflg, unsigned int efn, struct _iosa

                          *iosa_64, void *(*(return_va_64)), unsigned

                          __int64 *return_length_64,...);