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CSRC4DAC — Deactivate an extent z/OS MVS Programming: Assembler Services Reference ABE-HSP SA23-1369-00 |
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DescriptionCall the CSRC4DAC cell pool service to deactivate a specific extent. Use this service to prepare the cell pool for contraction. You must specify which extent you want to deactivate. EnvironmentThe requirements for the caller are:
Programming requirementsIf your program is in AR mode, issue the SYSSTATE macro with ASCENV=AR before you call CSRC4DAC so the CALL macro can generate the correct code for AR mode. As the program must be running in AMODE 64 to call this service, be sure to issue SYSSTATE AMODE64=YES at the point(s) where the program begins running in AMODE 64. Before you use cell pool services, you can optionally include the
CSRC4ASM macro to generate cell pool services equate (EQU) statements.
CSRC4ASM provides the following constants for use in your program:
RestrictionsAfter calling CSRC4DAC, you can still free (or return) cells, but you cannot get (or allocate) any others for this extent. Input register informationBefore calling the CSRC4DAC service, the caller does not have to place any information into any register unless using it in register notation for a particular parameter, or using it as a base register. Output register informationWhen control returns to the caller, the 64-bit general purpose
registers (GPRs) contain:
When control returns to the caller, the access registers (ARs)
contain:
Some callers depend on register contents remaining the same before and after issuing a service. If the system changes the contents of registers on which the caller depends, the caller must save them before issuing the service, and restore them after the system returns control. Performance implicationsNone. SyntaxWrite the call as shown on the syntax diagram. You must code all parameters on the CALL statement in the order shown.
ParametersAll input to callable services is in the form of RX-type addresses. The parameters are explained as follows:
ABEND codesNone. Return and reason codesWhen the CSRC4DAC service returns control to your program, GPR 15 (and return_code) contains one of the following return codes:
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Copyright IBM Corporation 1990, 2014
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