topic Shared memory and ABAP in Application Development and Automation Discussions

Shared memory and ABAP

Former Member — Mon, 12 Mar 2007 12:43:06 GMT

Dear developers,

I have some documentation on ABAP SHARED OBJECTS and I wonder how I could define shared memory objects at run time ( so I would need something like an API ) instead of using the SHMA transaction.

I actually also wonder what would happen if 2 users of the same shared object would call on one of its methods ? Can we have concurrent access ? How does the whole locking thing works ? Is it possible to implement waiting calls/locks ?

If you have any serious/technical documentation on semaphores/locks in SAP/ABAP I'd also be very interested.

Sincerely,

Olivier MATT

Re: Shared memory and ABAP

Former Member — Mon, 12 Mar 2007 12:55:34 GMT

Hi matt,

This is vijay here.

if you r working on frequntly changed data then you must use this locking technique.

well jus go to se11 and make a lock object by starting initial......EZ....

EX: EZENMARA.

then u can fix the lock as shared or (exclusive,cumulative) or( exclusive, not cumulative)

you can also fix the lock parameters like specific fields.then jus save and activate.

and when you will make a program jus call the function module enqueue_ezenmara for locking and dequeue_ezenmara for unlocking and u can get rest in my program.

regards

vijay

rewards if answer is helpfull.

TABLES: MARA.

PARAMETER: MATNR LIKE MARA-MATNR.

CALL FUNCTION 'ENQUEUE_EZENMARA'

EXPORTING

MODE_MARA = 'S'

MANDT = SY-MANDT

MATNR =

X_MATNR = 'MATNR'

_SCOPE = '2'
_WAIT = ' '
_COLLECT = ' '
EXCEPTIONS
FOREIGN_LOCK = 1
SYSTEM_FAILURE = 2
OTHERS = 3

IF SY-SUBRC = 0.

MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.

WRITE: 'TABLE IS LOCKED'.

ELSE.

SELECT * FROM MARA WHERE MATNR = MATNR.

WRITE:/ MARA-MATNR,MARA-ERNAM,MARA-MTART.

ENDSELECT.

ENDIF.

Re: Shared memory and ABAP

Former Member — Mon, 12 Mar 2007 13:22:08 GMT

Thanks.

But is it necessary to create such locks with a transaction. I mean that I need an API for creating/manipulating them.

I have also the same requirements for shared memory areas... Why does SAP only talks about transactions and doesnt seem to be providing APIs ?

If you have any information or material concerning these issues please let me know.

Sincerely,

Olivier MATT