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Architectural Changes
3.3 The Shared Library (LIBRTR.EXE)
Table 3–1 (Cont.) RTR Executables
RTR Version 2 RTR Version 3
RTRRTL No longer apply.
3.4 The ACP Process
The RTR Application Control Process (ACP) handles application control, and has
the process name RTRACP. This is unchanged from RTR Version 2.
3.5 Interprocess Communication
In RTR Version 2, global sections (cache) were used for interprocess
communication. In RTR Version 3, interprocess communication is handled
with mailboxes. Each RTR process, including any application process, has three
mailboxes to communicate with the RTRACP process:
• Read
• Write
• Beacon/Control
3.6 Shared Memory Parameters
With RTR Version 2, the SHOW RTR/PARAMS command showed the following:
• Maximum links
• Maximum facilities
• Maximum relations
• Maximum processes
• Cache pages
The /PARAMS qualifier is obsolete in RTR Version 3, and the parameters it
showed no longer apply. In RTR Version 3, these parameters are handled with
OpenVMS mailboxes, which you can check using OpenVMS procedures. See the
OpenVMS System Manager’s Manual: Essentials for more information.
3.7 Counters
In RTR Version 2, shared memory in global sections was directly accessible
using the RTR command server. In RTR Version 3, process counters are still
kept in shared memory, but they are accessed from the command server through
RTRACP. Thus, accessing these and other counters involves communicating with
RTRACP. Other counters are contained within the address space of the ACP.
3–2 Architectural Changes