TRY CATCH Block - Best Design

Hi,

I have a requirement where the database operation modify should take place, ONLY when there is no existing locks on the underlyining table...

I came with following

do

TRY.

Modify DBTAB

EXIT.

CATCH cx_root.

If sy-index > 10000

EXIT.

else.

wait up to 5 seconds.

Endif.

ENDTRY.

enddo.

Tries to Modify . If there is a exception(table is locked) it waits for 5 secs and reexecutes. Once execution is successful, the loop Exits....

Is this the best way to put something like this ina TRY CATCH Block