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No new user exit is required. Case 12 in user exit dfuex.mac (DFUEX CASE=12) already exists to do user processing during a DBCLS/dfcls call. The original intention of the user exit is to interrogate data collection counts, but it would also provide an appropriate point to put in user processing to release a block that was previously obtained during a file's open->close sequence. It is called from segment ubc0.asm just after other z/TPFDF-managed resources (such as DECB frames and B+Tree work areas) are released, and the SW00SR is addressable in R3.
Please feel free to close/decline. I will use DFUEX CASE=12 as suggested.
We wanted to know if you were aware that case 12 in user exit dfuex.mac (DFUEX CASE=12) already exists to do user processing during a DBCLS/dfcls call. The original intention of the user exit is to interrogate data collection counts, but we believe it would also provide an appropriate point to put in user processing to release a block that was previously obtained during a file's open->close sequence. It is called from segment ubc0.asm just after other z/TPFDF-managed resources (such as DECB frames and B+Tree work areas) are released, and the SW00SR is addressable in R3.
Please let us know if that would satisfy your needs. If it doesn't, please let us know what different functionality you are looking for. Thank you.