Previous topic |
Next topic |
Contents |
Contact z/OS |
Library |
PDF
Purging and Restoring I/O Requests (PURGE and RESTORE macros) z/OS DFSMSdfp Advanced Services SC23-6861-01 |
|
The system's purge routines perform either a halt or a quiesce
operation. In a halt operation, the purge routines stop the processing
of specified I/O requests initiated with an EXCP or EXCPVR macro instruction.
In a quiesce operation, the purge routines includes the following
procedures:
The system's restore routines make it possible to reprocess I/O requests that are quiesced. Restriction: Purge and restore processing
performed for I/O requests that are not initiated by an EXCP or EXCPVR
macro is not covered here. User applications that use the PURGE and
RESTORE macros with the sequential access method (SAM) against partitioned
data sets (PDSs) (for example, to synchronize the I/O) cannot do so
against PDSEs, sequential extended format data sets, or z/OS® UNIX files,
because SAM does not use EXCP or EXCPVR to access these types of data.
To pass control to the purge and restore routines, build a parameter list and place its address in register 1, then issue the macro instruction. 24-bit or 31-bit addressing mode can be used for the PURGE or RESTORE macro (and the parameter list). |
Copyright IBM Corporation 1990, 2014
|