System Control Blocks

Timing Control Table
The timing control table (TCT) contains
information utilized by the system
rranagement facilities (SMF) option. System
management facilities is an optional
feature that can be selected at system
generation for an MFT or MVT configuration
cf the Systern/360 operating System.
The timing control table is pointed to
ty the TCBTCT field, offset 164 decimal, of
the task control block.
The TCT is coreposed of;
1. The TCT proper which consists of:
• fields utilized by the SMF modules
• one or two storage tables depending
upon the kinds of storage allocated
-- processor storage or IBM 2361
Core Storage.
2. The TCT I/O table consisting of a TCT
I/O lookup table, and a TCT I/O
counter table.
The TCT I/O table need not be contiguous to
the TCT proper.
Figure 27 illustrates the format of the
TCT. Descriptions of the fields follow the
illustration.
TCT 333