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Using Commitment Control
for commitment control before you issue the STRCMTCTL command, the opening
of the file will fail.
The CL command ENDCMTCTL notifies the system that your activation group or
job has finished processing files under commitment control. See the
CL Reference
(Abridged)
for further information on the STRCMTCTL and ENDCMTCTL com-
mands.
Commitment Control Locks
On the STRCMTCTL command, you specify a level of locking, either
LCKLVL(*ALL), LCKLVL(*CHG), or LCKLVL(*CS). When your program is operating
under commitment control and has processed an input or output operation on a
record in a file under commitment control, the record is locked by commitment
control as follows:
Your program can access the record.
Another program in your activation group or job, with this file under commitment
control, can read the record. If the file is a shared file, the second program can
also update the record.
Another program in your activation group or job that does not have this file
under commitment control cannot read or update the record.
Another program in a separate activation group or job, with this file under com-
mitment control, can read the record if you specified LCKLVL(*CHG), but it
cannot read the record if you specified LCKLVL(*ALL). With either lock level,
the next program cannot update the record.
Another program that does not have this file under commitment control and that
is not in your activation group or job can read but not update the record.
Commitment control locks are different than normal locks, depend on the
LCKLVL specified, and can only be released by the COMMIT and ROLBK
operations.
The COMMIT and ROLBK operations release the locks on the records. The
UNLOCK operation will not release records locked using commitment control. See
the
CL Reference (Abridged)
for details on lock levels.
The number of entries that can be locked under commitment control before the
COMMIT or ROLBK operations are required may be limited. For more information,
see the
Backup and Recovery
manual.
Note: The SETLL and SETGT operations will lock a record in the same cases
where a read operation (not for update) would lock a record for commitment
control.
Commitment Control Scoping
When commitment control is started by using the STRCMTCTL command, the
system creates a commitment definition. A commitment definition contains infor-
mation pertaining to the resources being changed under commitment control within
that job. Each commitment definition is known only to the job that issued the
STRCMTCTL command and is ended when you issue the ENDCMTCTL command.
The scope for commitment definition indicates which programs within the job use
that commitment definition. A commitment definition can be scoped at the activation
group level or at the job level.
308 ILE RPG for AS/400 Programmer's Guide