In MVS, Common System Area is located at the top of the region. It is pointed to by R13. The first part of CSA is the register save area which is common for OS to point to via R13. CSA contains anchor pointer for many control blocks. CICS tables have been moved out to the OFL area.
CWA followed CSA is not in used by CiCS functions. It is a global memory area that can see by all user transaction. There is no pointer in CSA to point to CWA. This CWA is located by a fixed offset from CSA start address.
Optional Feature List follows CWA and is an extension to CSA. Because CWA is not pointed by CSA. Thus CWA cannot be relocated to another address and be located easily to give more space to extend CSA. OFL is added after CWA as an extension of CSA
No comments:
Post a Comment