Multiple Users Accessing Shared Memory

Question

I created a shared memory enabled class, and it works great for a simple scenario.  But, it's currently not sufficient for my needs.  Here's an example of what I'm trying to accomplish, and the events happen in this order!
User 1 writes data XXX to shared memory.
User 2 writes data YYY to shared memory.
User 1 reads from shared memory and I want him to get his data (XXX).
User 2 reads from shared memory and I obviously want him to get his YYY.
I do have a key I can use to differentiate my data but I don't know how to incorporate that in my process. 
Is the solution to write a table, rather than my current simple structure, to my shared memory?  But if I do this how do I clean off the "used" row after it is read?
Or is the solution to use some sort of instance of my class and reference the appropriate instance on each read?
Here's my write:
  data: lo_shared_area type ref to z_cl_rdn_shared_area,
        lo_root        type ref to z_cl_rdn_memory.
****get a pointer to the Shared Area
  lo_shared_area = z_cl_rdn_shared_area=>attach_for_write( ).
****Create an instance of our root
  create object lo_root area handle lo_shared_area.
****Set the Initial value for our message
  lo_root->set_ptwy( ps_ptwy ).
****Set the root back into the Area
  lo_shared_area->set_root(  lo_root ).
****Commit and detatch
  lo_shared_area->detach_commit( ).
Here's my read:
  data: lo_shared_area type ref to z_cl_rdn_shared_area,
        lo_root        type ref to z_cl_rdn_memory.
  lo_shared_area = z_cl_rdn_shared_area=>attach_for_read( ).
  lo_root        = lo_shared_area->root.
  try.
      ls_ptwy = lo_root->get_ptwy( ).
    catch cx_root.
      clear ls_ptwy.
  endtry.
  lo_shared_area->detach( ).
Thanks,
Mike

Answer 1

Hello,
Clearing shared memory will crash SAP   ie cleanipc.
Need to increase memory parameters
Check notes...
146289    Parameter Recommendations for 64-Bit SAP Kernel   
146528 "Configuration of R/3 on hosts with much RAM".                     
regards,
John Feely