pTAL Reference Manual (H06.03+)

Glossary
HP pTAL Reference Manual—523746-005
Glossary-3
breakpoint
breakpoint. A location in a program at which execution is suspended so that you can
examine and modify the program state. Breakpoints are set by debugger commands.
byte. An 8-bit storage unit; the smallest addressable unit of memory.
central processing unit (CPU). Historically, the main data processing unit of a computer.
HP NonStop™ servers have multiple cooperating processors rather than a single CPU.
See also processor.
character string constant. A string of one or more ASCII characters that you enclose
within quotation mark delimiters. Also referred to as a character string.
CISC. See complex instruction set computing (CISC).
code segment. A segment that contains program instructions to be executed, plus related
information. Applications can read code segments but cannot write to them.
code space. A part of virtual memory that is reserved for user code, user library code,
system code, and system library code. The current code space of your process
consists of an optional library code space and a user code space.
Common Run-Time Environment. See CRE.
compilation unit. A source file plus source code that is read in from other source files by
SOURCE directives, which together compose a single input to the compiler.
complex instruction set computing (CISC). A processor architecture based on a large
instruction set, characterized by numerous addressing modes, multicycle machine
instructions, and many special-purpose instructions. Compare to reduced instruction
set computing (RISC) and explicitly parallel instruction set computing (EPIC).
condition code. A status returned by expressions and by some file system procedure calls
as follows:
conditional expression. An expression that establishes the relationship between values
and results in a true or false value; an expression that consists of relational conditions
and conditional operators.
constant. A number or a character string.
constant expression. An arithmetic expression that contains only constants, LITERALs,
and DEFINEs as operands. Constant expressions can be evaluated at compilation
time.
Condition
Code Meaning Expression Status
CCG Condition-code-greater-than Positive
CCL Condition-code-less-than 0
CCE Condition-code-equal-to Negative