CALL CSRPQCL (Query a Cell)

The CALL CSRPQCL cell pool service is used to receive status information about a specified cell in a cell pool.

CSRPQCL reports whether the cell is free or allocated, and returns the number of the extent associated with the cell. CSRPQCL does not prevent other programs from changing the pool during or after a query. CSRPQCL returns the status as it was at the time you issued the call.

Format

Read syntax diagramSkip visual syntax diagramname CALL CSRPQCL,( cntl_alet, anchor_addr, cell_addr, cell_avail, extent_num, return_code)

Requirements for the caller

AMODE:
24 or 31 (System code must be in 31-bit addressing mode when calling the service. All input addresses must be valid 31-bit addresses.)
RMODE:
24 or ANY
ASC Mode:
Primary or AR (If the anchor and the extents are located in a data space, the caller must be in AR mode.)

Parameters

cntl_alet
Specifies the variable containing the ALET that identifies the location of the anchor and extents. Initialize the ALET to 0 if your program is running in AR mode and the anchor and extents are in the primary address space. If your program is running in primary ASC mode, the value is ignored, but you must code the parameter anyway.
anchor_addr
Specifies the variable containing the address of the 64-byte anchor.
cell_addr
Specifies the variable containing the address of the cell to be queried.
cell_avail
When CSRPQCL completes, the variable specified for cell_avail contains one of the following values. These indicate the status of the specified cell at the time you issued the CALL macro.
0
Cell available
1
Cell allocated
extent_num
When CSRPQCL completes, the variable specified for extent_num contains the number of the extent that contains the specified cell.
return_code
When CSRPQCL completes, the variable specifying return_code contains the return code.

Return Codes in Register 15

00
The operation was successful.
1C
Program error. The anchor address is not valid.

Action: Check to see if your program passed the wrong anchor address or inadvertently overlaid the anchor area.

54
Program error. The cell address is not valid.
Action: Investigate the following possible causes:
  • The input cell address does not point to the beginning of a cell.
  • The cell is not in the cell pool specified by the anchor address.
64
Program error or system error. An extent chain was broken.

Action: Check to see if your program inadvertently overlaid an extent area. Make sure that no extent belongs to more than one cell pool.

68
Program error or system error. An extent chain is circular.

Action: Check to see if your program inadvertently overlaid an extent area. Make sure that no extent belongs to more than one cell pool.