Accelerator Manual (G06.27+, H06.04+, J06.03+)

Glossary
Accelerator Manual—527303-003
Glossary-2
current working directory.
instructions, and many special-purpose instructions. Contrast with “reduced instruction-
set computing (RISC).”
current working directory. The directory from which relative pathnames are resolved. A
process always has a current working directory. See “working directory.”
D-series system. A system that is running a D-series version of the operating system.
directory. A file that contains directory entries. No two directory entries in the same
directory have the same name.
directory entry. An object that associates a filename with a file. Several directory entries
can associate names with the same file.
disk page. A unit of virtual storage. In both TNS and TNS/R systems, a disk page contains
2048 bytes. Contrast with “memory page.”
Guardian. An environment available for interactive or programmatic use with the HP
NonStop operating system. Processes that run in the Guardian environment use the
Guardian system procedure calls as their application program interface; interactive
users of the Guardian environment use the HP Tandem Advanced Command
Language (TACL) or another HP product’s command interpreter. Contrast with “Open
System Services (OSS).”
Guardian environment. The Guardian API, tools, and utilities.
HP NonStop operating system. The operating system for HP NonStop systems. The
operating system does not include any application program interfaces.
memory-exact point. A location in an accelerated program at which the values in memory
(but not necessarily in the register stack) are the same as they would be if the program
were running on a TNS processor. Most source statement boundaries are memory-
exact points. Complex statements might contain several such points: at each function
call, privileged instruction, and embedded assignment. Contrast with “register-exact
point.”
memory page. A unit of virtual storage. In TNS systems, a memory page contains 2048
bytes. In TNS/R systems, a memory page contains 4096 bytes. Contrast with “disk
page.”
millicode. RISC instructions that implement various TNS low-level functions such as
exception handling, real-time translation routines, and library routines that implement
the TNS instruction set. Millicode is functionally equivalent to TNS microcode.
misaligned. In TNS mode and accelerated mode, an erroneous address that is odd-byte
aligned; in TNS/R native mode, an inefficient address that is not aligned.