HP (Hewlett-Packard) 8.3 Garage Door Opener User Manual


 
HP OpenVMS Alpha Version 8.3 and HP OpenVMS Version 8.3-1H1 for Integrity Servers SPD 82.35.14
At a lower level, programs can call system services di-
rectly for security, event flag, asynchronous system trap,
logical name, record and file I/O, process control, timer,
time conversion, condition handling, lock management,
and memory management. Again, system services use
the appropriate platform calling standard and condition-
handling conventions.
OpenVMS supports the execution of user-mode images
created on earlier versions of OpenVMS. Typically, re-
compiling and relinking are not required.
MACRO Compiler
With minor modifications, VAX MACRO-32 sources can
be compiled for execution on Alpha or Integrity servers.
POSIX Threads Library
OpenVMS includes a user-mode, multithreading capa-
bility called POSIX Threads Library. POSIX Threads
Library provides a POSIX 1003.1-1996 standard style
threads interface. Additionally, POSIX Threads Li-
brary provides an interface that is the OpenVMS imple-
mentation of Distributed Computing Environment (DCE)
threads as defined by The Open Group.
POSIX Threads Library is a library of run-time rou-
tines that allows the user to create multiple threads
of execution within a single address space. With
POSIX Threads Library Kernel Threads features en-
abled, POSIX Threads Library provides for concurrent
processing across all CPUs by allowing a multithreaded
application to have a thread executing on every CPU
(on both symmetric and asymmetric multiprocessor sys-
tems). Multithreading allows computation activity to
overlap I/O activity. Synchronization elements, such as
mutexes and condition variables, are provided to help
ensure that shared resources are accessed correctly.
For scheduling and prioritizing threads, POSIX Threads
Library provides multiple scheduling policies. For de-
bugging multithreaded applications, POSIX Threads Li-
brary is supported by the OpenVMS Debugger. POSIX
Threads Library also provides Thread Independent Ser-
vices (TIS), which assist in the development of thread-
safe APIs.
Librarian Utility
The Librarian utility permits storage of object modules,
image files, macros, help files, text files, or any gen-
eral record-oriented information in central, easily acces-
sible files. Object module and image file libraries are
searched by the linker when the linker finds a reference
it cannot resolve in one of its input files. Macro libraries
are searched by MACRO-32 and MACRO-64 when ei-
ther finds a macro name that is not defined in the input
file.
Hypersort
Hypersort is a portable library of user-callable routines
that provide a high-performance sorting capability for
Alpha and Integrity servers.
Traceback Facility
When an application is compiled and linked with trace-
back information, the Traceback facility translates stack
frame addresses into routine names and line numbers
and displays a symbolic traceback whenever a runtime
error occurs in that application.
Debugger
The OpenVMS Debugger allows users to trace program
execution, as well as display and modify register con-
tents using the same symbols that are present in the
source code.
The debugger contains a heap analyzer feature that dis-
plays a graphic view of memory allocations and deallo-
cations in real time.
System Code Debugger
The OpenVMS System Code Debugger is a kernel code
debugger. It allows a system code developer to trace
the execution of nonpageable system code at any inter-
rupt priority level (IPL). Based on the OpenVMS Debug-
ger, the System Code Debugger uses the same inter-
face and most of the same command set.
System Dump Analyzer (SDA) Utility
In the event of a system failure, OpenVMS writes the
contents of memory to a preallocated dump file. This
dump file can later be analyzed using System Dump
Analyzer (SDA). System dumps can either be full mem-
ory dumps, where all memory is written, or selective
memory dumps, where only portions of memory in use
at the time of the system failure is written. The dump
file can be located on any locally connected disk. On
Alpha and Integrity servers, dump compression allows
both full and selective dumps to be written to smaller
files than required for uncompressed dumps. Full mem-
ory dumps, if not compressed, require a dump file big
enough to hold all memory. Selective memory dumps
write as much of the memory in use at the time of the
system failure that will fit into the dump file.
Spinlock Tracing Utility
The Spinlock Tracing Utility provides a mechanism for
characterizing spinlock usage and can collect perfor-
mance data for a given spinlock on a per-CPU basis.
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