System Control Blocks

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0(0) 4 (4) 8 (8) 12 (c) 16 (10) 20 (14) 24 (18) 28 (le) 32 (20) MULTIPROCESSING COMMUNICATION VECTOR TABLE CVTAFFLK CPU Affinity and Supervisar Lock CVTSTPTR Address of SHO LDT AP Routine CVTWnCB Address of Dispatcher WAIT Task CVTTKRM Address of Task Remova I Routi ne CVTGOV Address of GOVRFLB Table CVTIOTIO Address of Test I/o (TlO) Routine CVTIOTCH Address of Test Channel (TCH) Routine CVTSTOR Address of Notify Storage Online Routine CVTVRYOF Address of VARY Storage Offline Routine Figure 4. Multiprocessing Communication Vector Table 34 OS System Control Blocks (Release 21.7) 35 (23)
Page 1: Systems Reference Library IBM Syste
Page 6 and 7: Figures Figure 1A. Pointer Diagram
Page 11: System Control Blocks System contro
Page 14: . ..J MFT Figure lA. Pointer Diagra
Page 17 and 18: Contents Directory Entry (MVT Only)
Page 20: 20 OS System Control Blocks (Releas
Page 26 and 27: Offset -8 (-8) 2 Bytes and Field Al
Page 28: Offset 124 (7C) 4 128 (80) 4 132 (8
Page 32 and 33: 32 OS System Control Blocks (Releas
Page 37 and 38: Data Control Blocks Data control bl
Page 42: Common Interface 20 (14) 24 (18) DA
Page 50: I Offset 11 (11) • 1 18 (12) •
Page 60: Offset 82 (52) 84 (54) 1 85 (55)
Page 64: Continued 132 (84) Continued 144 (9
Page 67 and 68: Offset Bytes and Field Alignment Na
Page 69 and 70: Offset 50 (32) •• 2 50 (32) 51
Page 71 and 72: Offset 80 (50) 1 81 (51) • 1 82 (
Page 78 and 79: Offset 16 (10) 1 17 (11) • 3 20 (
Page 80 and 81: Offset 49 (31) • 1 50 (32) ••
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Offset 16 (10) 1 17 (11) • 1 18 (
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Offset 52 (34) 4 52 (34) 53 (35) 54
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DATA CONTROL BLOCK -- BTAM The data
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98 OS System Control Blocks (Releas
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Offset 20 (14) 1 21 (15) • 3 24 (
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Offset 40 (28) 8 48 (30) 1 49 (31)
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Data Extent Blocks There are two ki
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DATA EXTENT BLOCK -- ORDINARY The d
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Continued 40 (28) 44 (2C) 48 (30) 5
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Offset a 1 4 5 8 9 12 13 (0) 1 Byte
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Offset 41 (29) • 3 44 (2C) 4 45 (
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126 OS System Control Blocks (Relea
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Offset -16 (-10) 1 -15 (-F) • 7 -
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Offset 32 (20) 8 40 (28) 1 41 (29)
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Bytes and Offset Alignment -36 (-24
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138 os System Control Blocks (Relea
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0(0) DATA EVENT CONTROL BLOCK -- BS
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0(0) 4 (4) 8 (8) 12 (C) 16 (10) 20
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DATA EVENT CONTROL BLOCK -- BDAM Th
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Bytes and Offset Alignment 6 (6) .
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DATA EVENT CONTROL BLOCK -- QTAM 0(
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0(0) 4 (4) 8 (8) 12 (C) DATA EVEN!'
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Offset 28 (1C) Bytes and Field Alig
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Offset Bytes and Field Alignment Na
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Offset o (0) 4 +0 8 +8 +8 4 +8 2 By
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Data Set Control Blocks The data se
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FORMAT 1 -- IDENTIFIER DATA SET CON
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Offset o (0) 44 44 (2C) 1 45 (20)
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FORMAT 2 -- INDEX DATA SF!' CONTROL
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1 Offset o 1 8 13 20 25 36 (0) 1 By
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180 OS System control Blocks (Relea
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44 (2C) DS3FMTlD Format Identifier
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Offset Bytes and Alignment (44) 2 D
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FORMAT 6 -- SHARED EXTENT DATA SET
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Offset o (0) 3 Bytes and Field Alig
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DATA SET LABEL 2 -- FL2 Data set la
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Offset 36 (24) 1 37 (2S) • 1 38 (
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Offset +1 Bytes and Field Alignment
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Offset 16 (10) 7 17 (11) • 7 24 (
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INPUT/OUTPUT BLOCK Extension (Conti
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Offset 28 (lC) 1 29 (lC) • 1 28 (
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Offset 51 (33) 52 (34) 4 56 (38) 2
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Offset 79 (4F) 80 (50) 3 Bytes and
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Offset 113 (71) • 1 114 (72) •
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Job Step Control Block The job step
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Offset 240 (FO) 3 243 (F3) .1 244 (
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LINE CONTROL BLOCK Line Control Blo
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Offset 72 (48) 4 76 (4C) 2 78 (4E)
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254 05 System Control Blocks (Relea
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PARTITIONED DATA SET DIRECTORY ENTR
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PARTITIONED DATA SET DIRECTORY ENTR
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Request Blocks Request blocks are u
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REQUEST BLOCR -- MFT CONFIGURATIONS
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Offset 12 (e) 4 12 (e) 1 13 (D) •
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Page 280 and 281:
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INTERRUPTION REQUEST BLOCK -- MVT 0
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288 os system Control Blocks (Relea
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292 OS system Control Blocks (Relea
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0(0) SUPERVISOR REQUEST BLOCK -- MV
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SYSTEM MANAGEMENT CONTROL AREA 0(0)
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Page 313 and 314:
Task Control Block -- MFf Figure 26
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1116 (74) 120 (78) 124 (7C) 128 (80
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Offset 28 (lC) 1 29 (10) • 5 29 (
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Task Control Block -- MVT Figure 26
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Byte and Field Offset Alignment Nam
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Offset 33 (21) Byte and Alignment 3
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Timing Control Table The timing con
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Processor Storage Table I +0(0) +4(
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Offset +0 +2 +3 +4 +0 4 +4 1 +5 •
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346 as System Control Blocks (Relea
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Offset 24 (18) 4 Bytes and Field Al
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Offset 152 (98) 16 16S (AS) 16 184
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Offset 16 (10) 11 (11) 18 (12) 19 (
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DIRECT ACCESS STORAGE DEVICE CLASS
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Offset Bytes and Alignment 24 (18)
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Offset Bytes and Alignment COMMUNIC
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Volume Label A volume label is 80 c
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VTOC Data Set User Label Extent* or
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Page 391 and 392:
Environment Control Table The envir
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0(0) 8 (8) PROTECTED STEP CONTROL B
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Offset 26 (lA) •• 1 Byte and Fi
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Time-Sharing Interface Area The tim
Page 413:
User Profile Table The user profile
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data event control block 137 BDAM 1
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IBM System/360 Operating System: GC
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