gtpd1m38 | Database Reference |
CF support uses the following blocks:
The CFCB is a dynamic CF area whose contents are not maintained on file and are deleted by TPF restart. In addition, your application must reconnect the CFCB following each IPL.
There is one CFCB for each connection of a CF to the TPF system, and that CFCB contains information about the connection. Each time a CF connects to a CF structure, a new CFCB is obtained and added to the corresponding CFCB chains.
The CFSB is a dynamic CF area maintained in both main storage and fixed file records that contains information about a CF structure. There is one CFSB for each CF structure in any CF of the processor configuration.
Each time a CF structure is created in a CF, a new CFSB is obtained and added to the corresponding CFSB chain. The contents of the CFSB are maintained on file and rebuilt following each IPL
The CFRB is a dynamic CF area that monitors the progress of a CF macro call. Each time a CF macro is issued, a CFRB is obtained to monitor the progress of the macro call. CFRBs are chained as a queue in storage. The contents of the CFRB are not maintained on file.
The CFVB is a dynamic CF area whose contents are not maintained on file. CF support uses CFVBs to track completion of asynchronous CF requests, and to maintain validity of data in local cache buffers.