On Alpha and Integrity server systems, locks a range of pages in
    memory. The specified virtual pages are forced into the working
    set and then locked in memory. A locked page is not swapped out
    of memory if the working set of the process is swapped out. These
    pages are not candidates for page replacement and, in this sense,
    are locked in the working set as well.

    This service accepts 64-bit addresses.

    Format

      SYS$LCKPAG_64  start_va_64 ,length_64 ,acmode ,return_va_64

                     ,return_length_64

    C Prototype

      int sys$lckpag_64  (void *start_va_64, unsigned __int64

                         length_64, unsigned int acmode, void

                         *(*(return_va_64)), unsigned __int64

                         *return_length_64);