System Control Blocks

Offset
31 (IF)
32 (20)
Byte and Field
Alignment Name
TCBFLGS
(Continued)
Byte 3
1 ...
.1 ..
· .1.
• .. 1
Byte
1 ••.
· 1 ..
· .1.
• •• x
xxxx
. . . 1
4
1 ...
• 1 .•
•• 1.
· . .• • •. 1
328 OS System Control Blocks (Release 21.7)
TASK CONTROL BLOCK -- MVT
Hex.
Dig. Field Description, Contents, Meaning
All PSWs for this task in supervisor state.
Job step TCB:
Job step has invoked rollouts that are still in
effect.
Prevent multiple scheduling of ABENDs.
RB for this STAE was key zero.
(Reserved bits.)
This task was detached with the STAE=YES option •
(If any bit in this byte is 1, the task is
non-dispatchable.)
set up ABDUMP.
SERl non-dispatchability indicator.
Supply of I/O request queue elements exhausted.
(Reserved bit.)
System is processing a timer asynchronous exit
routine.
Vary or quiesce in multiprocessing system •
MVT with Model 65 multi-processing:
Task has been set non-dispatchable by one CPU to
prevent any CPU from working on it.
ABEND routine was entered by this task while DCB for
SYSABEND (or SYSUDUMP) data set was being opened for
another task in same job step.