GDSX Manual

Design and Development

Extended General Device Support (GDSX) Manual–134303

2-56

MAXBUFPOOL

This static parameter can be used to specify the maximum size of the extended buffer

pool.

If the size specified for the extended buffer pool is too large, error message 10002 is sent

to the home terminal:

10002 maxTCBpool or Buffer/Msg pool too large

MAXCPSIZE

This static parameter determines the size of the buffer sent when USCODE does a

checkpoint to the backup process. This buffer is in the extended segment for control

structures. See "Space Usages and Limitations" on page 2-18.

The Q^CP procedure moves local memory global data within a user’s named or private

global data block to the checkpoint buffer. The Q^CPX procedure moves extended

memory data to the checkpoint buffer. Up to four data areas can be moved to the

checkpoint buffer with a single call to Q^CP[X]. Multiple calls to Q^CP[X] can be done

before calling DO^CP or ^CHECKPOINT. Q^CP[X] queues data until the data in the

checkpoint buffer, of the word size specified by MAXCPSIZE, including three control

words per data area copied, exceeds the size of MAXCPSIZE.

If the checkpoint buffer overflows during a call to Q^CP[X] from the USER^BACKUP

exit, TSCODE automatically writes the current checkpoint buffer to the backup process.

TSCODE ensures that MAXCPSIZE is at least the size of TASKCPSIZE.

MAXDCBPOOL

This static parameter can be used to override the calculation of DCB pool space done

automatically by TSCODE during process initialization. In general, you should not

need to set this parameter.

Internal DEFINE Name CONFIG^PARAMS Name Default Value Range

maxbufpoolsize maxbufpool^size 32K bytes Up to 7.5

megabytes

Internal DEFINE Name CONFIG^PARAMS Name Default Value Range

max^cp^wds max^chkpt^wds 4096 words 512–16,364

words

Caution. If the checkpoint buffer overflows during a call to Q^CP[X] from a user exit other than

USER^BACKUP, the backup process will be terminated and Q^CP[X] will return 0. To prevent

this, ensure that MAXCPSIZE is large enough. If the backup process is terminated, it is still

the caller’s responsibility to release the semaphore by means of GIVE^CPSEM.

Internal DEFINE

Name

CONFIG^PARAMS

Name Default Value Range

maxdcbpoolsize maxdcbpool^size (see following

equation)

Up to 131,064 bytes