LINK, XCTL, RETURN - Differences

ranjithmainframe · New User Joined: 21 Jan 2008 Posts: 39 Location: chennai

Hi,

Could you please explain my query below.

LINK - transfers control to lower level expecting return
XCTL - transfers the control to same logical level
RETURN - To return to next higher level program.

Query is what does level mean - Lower, higher and same level?. Please explain.

Thanks in Advance,
Ranjith

ranjithmainframe · New User Joined: 21 Jan 2008 Posts: 39 Location: chennai

Hi,

Can you brief what does same/lower logical level mean?.. I am unable to get an example for the same.

Ranjith

Raghu navaikulam · Posted: Fri Aug 21, 2009 2:20 pm

Hi Ranjith

When you are logging on to CICS, you are in the 0 level in CICS. That is the highest level. When you run a transaction, your transaction works under CICS, that is your transaction is in level 1. When the transaction issues a LINK, the linked program works under level 1, i.e. under the main program. So the linked program is in level 2. If the main program issues a XCTL, the XCTLed program works in the same level as the main program, i.e. level 1 itself. Similarly when the main program issues a RETURN , the RETURNed program also works in the same logical level as that of the main program.

Hope this will help you
Regards
Raghu

ranjithmainframe · New User Joined: 21 Jan 2008 Posts: 39 Location: chennai

Hi Raghu,

Thanks for your quick response.

Explaination given is very usefull!!

Thanks,
Ranjith

Raghu navaikulam · Posted: Fri Aug 21, 2009 2:43 pm

You are welcome

Raghu

Earl Haigh · Active User Joined: 25 Jul 2006 Posts: 475

Please post these type of entry level and interview questions on another forum.