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Offset<br />
12 (e) 4<br />
12 (e) 1<br />
13 (D) • 3<br />
16 (10) 8<br />
16 (10) 4<br />
20 (14) 4<br />
24 (18) 4<br />
28 (lC) 1<br />
29 (In) • 3<br />
Bytes and Field<br />
Alignment Name<br />
XRWTL<br />
XRBUSE<br />
XRBEP<br />
XRBPSW<br />
XRREQ<br />
XRTLPRB<br />
XRBQ<br />
XRBWT<br />
XRBLNK<br />
REQUEST BLOCK -- MFT<br />
Field Description, Contents, Meaning<br />
FRB only:<br />
Address of the most recent wait list element.<br />
All RBs except FRB:<br />
Use count (the number of loads via the LOAD macro<br />
instruction less the number of deletes via the DELETE<br />
macro instruction).<br />
Entry point address.<br />
End of LRB<br />
(unless the program was hierarchy block loaded -<br />
XSTAB byte 1 bit 6 on.)<br />
User's old PSW.<br />
FRB only:<br />
Address of the TeB for the task which requested that<br />
the module be loaded.<br />
FRB only:<br />
Address of the LPRB built by FINCH for the program<br />
which has been brought in by a LOAD macro<br />
instruction.<br />
End of the FRB<br />
IRB:<br />
Address of a 12 byte or 16 byte request element.<br />
LPRB:<br />
Address of an LPRB describing an entry identified via<br />
the IDENTIFY macro instruction.<br />
PRB:<br />
Address of an LPRB describing an entry identified via<br />
the IDENTIFY macro instruction.<br />
SIRB:<br />
Address of a 12 byte or 16 byte request element.<br />
SVRB:<br />
For type 3 and type 4 SVCs this field will contain<br />
the size of the program in bytes.<br />
Wait count.<br />
276 OS <strong>System</strong> <strong>Control</strong> <strong>Blocks</strong> (Release 21.7)<br />
Primary (active) queuing field. Address of the<br />
previous RB for the task. Address of the TCB if this<br />
is the first or only RB on the queue.<br />
End of LPRB and PRB<br />
(unless the program was hierarchy block loaded -<br />
XSTAB byte 1 bit 6 on.)
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