How to restrict simultaneous execution of two programs?

Hi Experts,
Need inputs for the situation described below:
We have two programs prog A and prog B. These are independent executable programs and have no dependency on each other. I want to restrict execution of prog B if prog A is running in any session by any user. Is there any system/basis table which stores runtime status of all the programs? There should be some table where all the currently executing programs get stored and once program is completed, entry is cleared from the table.
One way can be:
When prog A has started execution, add an entry in any Z table and at the time of finishing delete the particular entry. In prog B check that the table has any entry for prog A. If yes that means prog A is still running.
Issue with this approach is, if program A has some error or cancelled while execution, it will not delete its own entry and hence even if prog A is finished, prog B will find entry in Ztable.
Any other way to achieve this functionality?
This is very urgent.Please help!
TIA
Abhishek

Hi,
Although I don't understand why you need to serialized two programs
that have no dependency on each other, maybe the following code can help provided the programs are executed using specific tcodes.
DATA: BEGIN OF USR_TABL OCCURS 10.
INCLUDE STRUCTURE UINFO.
DATA: END OF USR_TABL.
CONSTANTS: OPCODE_LIST LIKE TH_OPCODE VALUE 2.
refresh USR_TABL.
CALL 'ThUsrInfo' ID 'OPCODE' field OPCODE_LIST
ID 'TAB' FIELD USR_TABL-SYS.
sort usr_tabl by mandt bname.
You can check wheter the other program(tcode) is being run from itab USR_TABL, good luck.
Jeffrey Satriadi

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Although I don't understand why you need to serialized two programs
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How to restrict simultaneous execution of two programs?

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