Previous topic |
Next topic |
Contents |
Contact z/OS |
Library |
PDF
How CICS selects an L8 mode TCB z/OS Communications Server: IP CICS Sockets Guide SC27-3649-00 |
|
The CICS® dispatcher manages the pool of L8 mode TCBs up to the limit set by the MAXOPENTCBS system initialization parameter. At any one time, the pool can consist of some TCBs that are allocated to tasks, and others that are free. For example, if the maximum number of L8 mode TCBs is set to 10, at a particular time the pool can consist of 5 TCBs, not all of which are allocated to running tasks. The CICS dispatcher attaches a new TCB when it cannot find a free TCB that is suitable. The process of allocating an L8 mode TCB is summarized in the following steps:
The various events that can occur during the TCB allocation process are recorded in the dispatcher TCB pool statistics, and these are reported by the DFH0STAT statistics program. |
Copyright IBM Corporation 1990, 2014
|