- Entry:
- UNLK
- VIT option:
- LOCK
- Event:
- Release a lock
- VIT processing module:
- ISTRACLK
- Control is returned to:
- ISTAPC33
This trace record contains information for a routine releasing
a lock. It is the complement of an LKEX or LKSH entry. 
- Byte (hex)
- Contents
- 00–03
- Record ID: C"UNLK"
- 04
- ID is the primary address space ID (ASID). This field is 0 if the ASID is greater than X'FF'.
- 05
- 0
- 06–07
- Level of lock to be released. See z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures for a listing of VTAM® locks.
- 08–0B
- Address of lock to be released
- 0C–0F
- CRA lock account word (CRALKACT)
- 10–13
- Address of the issuer of the TPUNLOCK macro
- 14–1A
- Lockword pointed to by address in bytes 08–0B
- 1B
- The LOCK ID field. See z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures for a list of VTAM locks.
- 1C–1F
- Request parameter header (RPH) address