EPTRACE Manual

Glossary
EPTRACE Manual—528811-002
Glossary-10
OSS
OSS. See Open System Services (OSS).
OSS environment. See Open System Services (OSS) environment.
OSS process ID. In the Open System Services (OSS) environment, the unique identifier
that identifies a process during the lifetime of the process and during the lifetime of the
process group of that process.
OSS user ID. See HP NonStop™ operating system user ID.
pathname. In the Open System Services (OSS) file system and Network File System
(NFS), the string of characters that uniquely identifies a file within its file system. A
pathname can be either relative or absolute. See also ISO/IEC IS 9945-1:1990
(ANSI/IEEE Std. 1003.1-1990 or POSIX.1), Clause 2.2.2.57.
pathname component. See filename.
PIN. See process identification number (PIN).
process group. In the Open System Services (OSS) environment, a set of processes that
can signal associated processes. Each process in an Expand node is a member of a
process group. The process group has a process group ID. A new process becomes a
member of the process group of its creator.
process group ID. In the Open System Services (OSS) environment, the unique identifier
representing a process group during its lifetime.
process group leader. In the Open System Services (OSS) environment, the process that
has the process group ID of its process group as its OSS process ID.
process group lifetime. In the Open System Services (OSS) environment, the period that
begins when a process group is created and ends when the lifetime of the last
remaining process of the group ends.
process ID. In the Guardian environment, the content of a 4-integer array that uniquely
identifies a process during the lifetime of the process.
process identification number (PIN). A number that uniquely identifies a process running
in a processor. The same number can exist in other processors in the same system.
See also process ID.
processor. (1) A functional unit of a computer that reads program instructions, moves data
between processor memory and the input/output controllers, and performs arithmetic
operations. Because a processor is composed of several hardware components that
reside in different enclosures, it is sometimes called a logical processor. A processor is
sometimes referred to as a central processing unit (CPU), but HP NonStop™ servers
have multiple cooperating processors rather than a single CPU. (2) One or more
computer chips, typically mounted on a logic board, that are designed to perform data
processing or to manage a particular aspect of computer operations.