System Control Blocks

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1-32 (20) r- L,. 0(0) 4 (4) 8 (8) 12 (C) 16 (10) 20 (14) TASK CONTROL BLOCK -- MFT TCBFRS Floating - Point Register Save Area TCBRBP Address of RB TCBPI E Address of Program Interrupt Element TCBDEB Address of DEB Queue TCBTIO Flags and Address of Task I/O Table TCBCMP Task Completion Code 21 (15) TCBFLTRN TCBTRN Flags Flags and Address of Control Core Table (TESTRAN) 24 (18) 25 (19) Reserved TCBMSS Address of Boundary Box 28 (lC) 29 (lD) TCBPKF TCBFLGS Protection Key Task End, Miscellaneous, and Dispatchabi!ity F!ags 36 (24) 40 (28) 44 (2C) 48 (30) 112 (70) TCBIDF TCB Identifier 113 (71) 34 (22) TCBLMP Enqueue Count TCBLLS Address of Last RB for Program Loaded by LOAD TCBJLB Address of JOBLIB DCB TCBFT JST Address of the Job Step TCB TCBGRS General Register Save Area Figure 26A. Task Control Block -- MFT (Part 1 of 2) 314 OS System control Blocks (Release 21.7) TCBFSA Address of First Program Save Area 35 (23) TCBDSP Dispatching Priority 1 .., .... ..,1..
1116 (74) 120 (78) 124 (7C) 128 (80) 1132 (84) 136 (88) 140 (8C) 144 (90) 148 (94) TASK CONTROL BLOCK -- MFT : \".. .... : \... .... Address of Next Lower Priority TCB TCBTME Address of Timer Element TCBPIB Partition Type and Address of the PiS TCBNTC Address of Previous TCB on Subtask Queue TeBOTe - Address of Originating TCB TCBLTC Address of the Last TCB on the Subtask Queue TCBIQE Address of the IQE for the ETXR Routine TCBECB Address of the ECB to be Posted on Task Completion Reserved 152 (98) 153 (99) TCBFTLMP TCBFTFLG Limit Priority Flag Bytes 156 (9C) 160 (AO) 164 (A4) 168 (A8) Reserved TCBNSTAE STAE Flags and Address of Current STAE Control Block TeBTeT Address of the TCT TCBUSER 172 (.A.C) TCBDAR 173 (AD) TCBNDSP DAR Flags Secondary Non-dispatchability Bits 176 (B8) 180 (C4) f,eserved 181 (B5) TCBRECDE TCBJSCB ABEND Recursion Address of the JSCB Figure 26A. Task Control Block -- MFT (Part 2 of 2) 183(87) TCB -- MFT 315
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Systems Reference Library IBM Syste
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Figures Figure 1A. Pointer Diagram
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System Control Blocks System contro
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. ..J MFT Figure lA. Pointer Diagra
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Contents Directory Entry (MVT Only)
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20 OS System Control Blocks (Releas
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Offset -8 (-8) 2 Bytes and Field Al
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Offset 124 (7C) 4 128 (80) 4 132 (8
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0(0) 4 (4) 8 (8) 12 (c) 16 (10) 20
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DATA CONTROL BLOCK -- SAM Continued
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Offset 53 (35) • 3 56 (38) 1 57 (
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Device Interface 16 (10) Common Int
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Offset 16 (10) 1 11 (11) • 1 18 (
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Offset 40 (28) 8 48 (30) 1 49 (31)
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Offset Bytes and Field Alignment Na
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Device Interface 16 (10) Common Int
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WTTA Interface 16 (10) DCBBQFLG Dat
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Offset 20 (14) 1 21 (15) • 3 24 (
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Offset Bytes and Field Alignment N
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DATA CONTROL BLOCK -- TCAM The form
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Offset 33 (21) • 3 36 (24) 1 37 (
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Offset 52 (34) 1 52 (34) 4 56 (38)
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112 OS System Control Blocks (Relea
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Appendage Table DATA EXTENT BLOCK -
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offset -36 (-24) 4 -32 (-20) 4 -28
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Offset +0 +0 +0 +1 +0 +4 +8 +0 +4 +
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DATA EXTENT BLOCK -- QTAM MESSAGE P
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Offset 48 (30) 4 52 (34) 1 53 (35)
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- 36 (- 24) -32 (-20) -28 (+ lC) -2
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DATA EVENT CONTROL BLOCK -- BSAM Th
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Offset 12 (e) 4 16 (10) 4 20 (14) 4
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DATA EVENT CONTROL BLOCK -- BlSAM T
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o (0) DATA EVENT CONTROL BLOCK -- B
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DATA EVENT CONTROL BLOCK -- QTAM Th
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DATA EVENT CONTROL BLOCK -- BTAM Th
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Offset 28 (lC) 29 (lD) • 1 Bytes
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Device Name Table The device name t
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166 05 System Control Blocks (Relea
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10 (0) ....,r- 44 (2C) DS1FMTID For
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72 (48) FORMAT 2 -- INDEX DATA SET
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Offset 64 (40) 2 Bytes and Alignmen
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FORMAT 3 -- EXTENSION DATA SET CONT
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Offset o (OJ 44 44 (2C) 1 45 (2D)
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...... ---r 0(0) 4 (4) 44 (2C) DS5F
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FORMAT 6 -- SHARED EXTENT DATA SET
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Data Set Labels -- Magnetic Tape Th
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o (0) :.::: 4 (4) .,r- Continued Co
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198 OS system Control Blocks (Relea
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0(0) 4 (4) 16 (10) 36 (24) FL2RECFM
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Event Control Block The event contr
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INTERRUPTION CONTROL BLOCR 0(0) ICB
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Input/Output Block The input/output
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Offset 68 (44) 1 70 (46) •• 2 7
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Offset 101 (65) • 1 101 (65) •
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JOB STEP CONTROL BLOCK 240 (FO) JSC
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240 os System Control Blocks (Relea
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Offset 40 (28) 2 40 (28) 41 (29) 42
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Offset 96 (60) 1 91 (61) • 3 100
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Page 263: Offset I o (0) 8 8 (8) 3 *tes and ,
Page 268 and 269: Offset Bytes and Alignment I 24 (18
Page 270 and 271: 270 OS System Control Blocks (Relea
Page 274: Offset Bytes and Field A1ignment Na
Page 277 and 278: Offset Bytes and Field Alignment Na
Page 279 and 280: REQUEST BLOCKS -- MVT CONFIGURATION
Page 281 and 282: Interruption Request Block -- MVT T
Page 285: proqram Request Block -- MVT The pr
Page 291 and 292: Offset o (0) B 8 (8) 1 9 (9) • 1
Page 293 and 294: Supervisor Request Blocks -- MVT Th
Page 295 and 296: Supervisor Request Block -- MVT --
Page 297 and 298: SUPERVISOR REQUEST BLOCK -- MVT --
Page 302: 302 OS system Control Blocks (Relea
Page 306: Offset o 1 2 4 8 (0) 1 Bytes and Fi
Page 309 and 310: Bytes and Offset Alignment 105 (69)
Page 316 and 317: Bytes and Field Offset Alignment Na
Page 325 and 326: 1116 (74) 120 (78) 124 (7C) 128 (80
Page 328 and 329: Offset 31 (IF) 32 (20) Byte and Fie
Page 331: Offset 168 (AB) 4 172 (AC) 1 173 (A
Page 334 and 335: TIMING CONTROL TABLE 0(0) TCTQA 3 (
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Offset Bytes and Alignment 10 (A)
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MAGNETIC TAPE DEVICE CLASS UCBTYP B
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Byte 1 lOS Flogs I Model Code I UCB
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UCB + 16 (10) Offset 16 (10) 1 Byte
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ASCII Volume Header Label I 0 (0) 1
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Volume Table of Contents The volume
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Volume Table of Contents The volume
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Time-Sharing Option Control Blocks
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Driver Parameter Area The driver pa
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ENVIRONMENT CONTROL TABLE 0(0) ECTR
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Protected Step Control Block The pr
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Offset o (0) 7 Byte and Field Align
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Time-Sharing Job Block The time sha
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Indexes to system reference library
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liO coo.nter table 339 I/O lookup t
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System Control Blocks

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