The lock_put function releases lock from the lock table.
The lock_put function returns a non-zero error value on failure and 0 on success.
Errors
The lock_put function may fail and return a non-zero error for the following conditions:
EINVAL
An invalid flag value or parameter was specified.
The lock_put function may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
If a catastrophic error has occurred, the lock_put function may fail and return
DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail
in the same way.