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Binop B
Active User
Joined: 18 Jun 2009
Posts: 407
Location: Nashville, TN
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| enrico-sorichetti wrote: |
if You mean Airline control system ...
You should have specified that in the OP not to confuse people 
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 .. i thought ALCS was the short for Airline Control System like CICS for Customer Information Control System... |
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enrico-sorichetti
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Joined: 14 Mar 2007
Posts: 10873
Location: italy
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| Quote: |
| But i thought we had a small disagreement on what happens when we issue a RETURN statement from the XCTL'ed program... not the XCTL concept as such |
if You had had clear the concept of XCTL there would not have ben any disagreement 
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| XCTL transfers control from one application program to another at the same logical level. The program from which control is transferred is released. If the program to which control is transferred is not already in main storage, it is loaded. |
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LINK passes control from an application program at one logical level to an application program at the next lower logical level. If the requested program is not defined to CICS, and AUTOINSTALL is active, CICS supplies a definition for the program. If it is not a remote program in another CICS region, and the linked-to program is not already in main storage, CICS loads it. If the SYSID option specifies the name of a remote CICS region, CICS ships the link request to the remote region. When the RETURN command is executed in the linked-to program, control is returned to the program initiating the link at the next sequential executable instruction.
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| Quote: |
| RETURN returns control from an application program either to an application program at the next higher logical level, or to CICS. |
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enrico-sorichetti
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Binop B
Active User
Joined: 18 Jun 2009
Posts: 407
Location: Nashville, TN
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| enrico-sorichetti wrote: |
| Quote: |
| ALCS, on a very high level, can be considered to a previous version of CICS. |
bullshit
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 .. yup .. for someone who knows about ALCS.. the definition I gave is nonsense... for a moment i thought ALCS was a completely unknown factor ( thought streghthened by the fact that I could find only 1 or 2 topics regarding ALCS in the forum ).
When i said that "ALCS, on a very high level, can be considered to a previous version of CICS."... just to give a basic understanding its an online system with some features but not as much as CICS. Sorry for the confusion.. |
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enrico-sorichetti
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Joined: 14 Mar 2007
Posts: 10873
Location: italy
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| Quote: |
| hought ALCS was the short for Airline Control System |
yes it is but not very common knowledge,
after Your hints was easy to understand the environment
ALCS used also to mean Assembler Language Code Support
ALC Assembler Language Code
anyway ...
ALCS/TPF/zTPF Assembler language even if compatible to some extent with the HLASM family running on zOS
provides additional facilities and macros for services not available on HLASM and zOS and related products
the macro You quoted, certanily belongs to that family,
the TPF family was designed to handle thousandths of transaction per second
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| z/TPF’s largest customers are able to achieve throughput exceeding 1.4M I/O operations per second (IO/s) and transaction rates well over 25K tps |
so it was reasonable to provide a quick exit to TPF itself from any level of the programming hierarchy, not so for CICS and IMS
also ACP/TPF/zTPF were/are operating systems themselves not applications running under an operating system
www-01.ibm.com/software/htp/tpf/pres/TPF_Performance_Whitepaper_rel1.pdf |
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Earl Haigh
Active User
Joined: 25 Jul 2006
Posts: 475
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Phew!! All this discussion...
just do an EXEC CICS RETURN
and be done with it..
How much do they pay in India for an experienced CICS consultant?
Sure seems to be a lot of work there. |
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enrico-sorichetti
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Joined: 14 Mar 2007
Posts: 10873
Location: italy
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| Quote: |
| ... or subroutines ( subsequent level - program LINK ed )... |
that' the detail causing the troubled discussion |
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