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Offset<br />
28 (lC) 1<br />
29 (10) • 5<br />
29 (10)<br />
30 (lE)<br />
31 (IF)<br />
32 (20)<br />
33 (21)<br />
34 (22) •• 1<br />
Bytes and Field<br />
Alignment Name<br />
TCBPKF<br />
xxxx 0000<br />
TCBFLGS<br />
Byte 1<br />
1 •••<br />
• 1 ••<br />
· .1.<br />
• •• 1<br />
Byte 2<br />
1 •..<br />
• x ••<br />
.. 1.<br />
••. 1<br />
Byte 3<br />
xx.x<br />
•• 1.<br />
Byte 4<br />
Byte 5<br />
.1 ..<br />
x •••<br />
.1 ..<br />
•• 1.<br />
• •• 1<br />
1 •••<br />
. 1 •.<br />
· .1.<br />
• .. 1<br />
1 ..•<br />
. 1 ..<br />
· .1.<br />
TASK CONTROL BLOCK -- MFT<br />
Hex.<br />
Dig. Field Description, Contents, Meaning<br />
Storage protection key for this task. If there is no<br />
storage protection, all bits are zero.<br />
Storage protection key.<br />
Must be zeros.<br />
Flag byte fields.<br />
Abnormal termination in progress.<br />
Normal termination in progress •<br />
ABEND was initiated by the resident abnormal<br />
termination routine.<br />
TCBGTOFM-Generalized trace facility (GTF) trace has<br />
been suspended.<br />
(Reserved)<br />
TCBPOOL - The ABEND SVRB pool is assigned to this<br />
task.<br />
problem program storage has been overlaid to process<br />
ABEND.<br />
prohibit queuing of asynchronous exits for this task.<br />
<strong>System</strong> task: ABEND prohibited for this task.<br />
(Reserved bits)<br />
Task has stopped trace table •<br />
Task has issued a system-must-complete and set all<br />
other tasks in the system non-dispatchable.<br />
Task has issued a step-must-complete and turned off<br />
all other tasks in the step.<br />
Dump processing initiated in ABEND •<br />
ETXR to be scheduled.<br />
This task is a member of a time-sliced group.<br />
(Reserved bits)<br />
Exit Effector:<br />
<strong>System</strong> error routines already operating for this<br />
task.<br />
Floating point registers exist.<br />
Job scheduler routines in process •<br />
XCTL routine is changing the storage protection key<br />
in the PSW from zero to the one used by the problem<br />
program •<br />
••• 1 TCAM termination invoked.<br />
••• 1<br />
1 ••.<br />
.1 ••<br />
x. xx •• x.<br />
TCBLMP<br />
Reserved.<br />
(If any bit in this byte is 1, the task is<br />
non-dispatchable.)<br />
<strong>System</strong> is processing a timer asynchronous exit<br />
routine. (MFT)<br />
primary non-dispatchability bit. This bit is set to<br />
1 if any of the secondary non-dispatchability bits<br />
(offset 173 through 175) is set to 1. This bit is<br />
set to 0 if a secondary non-dispatchability bit is<br />
set to 0 and all other secondary non-dispatchability<br />
bits are o.<br />
Another task is in system-must-complete status.<br />
Another task in this job step is in must-complete<br />
status.<br />
(Reserved bits).<br />
Number of resources for which this task is enqueued.<br />
TCB -- MFT 317
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