z/TPF Program Management - IBM

Online general file loader component (ACPL)
General
File
LDCRL
Figure 4 shows what happens when you IPL the loader general file.
General file IPL
(initializer program)
General file
loader
online component
(ACPL)
General file IPL
(restart scheduler)
LDCRL = Loader control record
Primary process
Data flow
Online
module
Online
module
When you IPL the loader general file, the online general file loader component
(ACPL) is placed in main storage. ACPL then uses the loader control record
(LDCRL) to load the contents of the loader general file on the online modules.
Keypoints, if present in the loader general file (LGF), are loaded to the prime and
duplicate modules. They are copied to the first 256 modules of the same type as
the prime module during online processing.
When online loading has been completed, the operator is notified about all the
components that were loaded. If the IPL is unsuccessful, the operator is sent all of
the error messages for the run.
If the IPL is successful, the online general file loader sends the following message
to the operator terminal:
ACPL0001I SYSTEM LOAD COMPLETE
LOAD DATA AFTER 1052 STATE IF NEEDED
IF NOT IPL PRIME MODULE ccud
This message reminds an operator who is performing a full load to load data after
the system has reached 1052 state (see “Load fixed-file records” on page 74).
Offline image loader component (TLDR)
Online
module
Figure 4. General file IPL using the general file loader online component (ACPL)
Figure 5 on page 24 shows how system components are loaded by the offline
image loader component (TLDR).
z/TPF loaders 23