OpenVMS VAX System Dump Analyzer Utility Manual

Document revision date: 19 July 1999

OpenVMS VAX System Dump Analyzer Utility Manual

Contents

Index

The SHOW PROCESS/LOCKS/INDEX=0A command displays information about the locks held by process JOB_CONTROL, whose PCB is at index 0A, into the system's PCB list. This command implicitly makes JOB_CONTROL the SDA current process for subsequent commands that display process context information. It has no effect on SDA CPU context because JOB_CONTROL is not current on any processor in the multiprocessing system.

#4

SDA> SHOW RMS

#4
SDA> SHOW RMS

RMS Display Options: IFB,IRB,IDX,BDB,BDBSUM,ASB,CCB,WCB,FCB,FAB,RAB,NAM,XAB,RLB, BLB,BLBSUM,GBD,GBH,FWA,GBDSUM,JFB,NWA,RU,DRC,SFSB,GBSB Display RMS structures for all IFI values. SDA> SHOW PROCESS/RMS . . . Process index: 0032 Name: BEASSEM_MTHRTL_ Extended PID: 27200132 -------------------------------------------------------------------- IFAB Address: 7FF9C808 IFI: 0002 Organization: Sequential ------------ PRIM_DEV: 1C4D4108 DIR,FOD,SHR,AVL,ELG,IDV,ODV,RND BKPBITS: 00080020 ACCESSED,NORECLK BLN: 3A 58. BID: 0B 11. EFN: 00 MODE: 03 IOS: 00000001 ASBADDR: 00000000 IOS2: 0000 WAIT_Q_FLINK: 00000000 IOS4: 00000000 ARGLST: 7FF21418 ATJNLBUF: 00000000 WAIT_Q_BLINK: 00000000 FSBPTR: 00000000 AGENT_MODE: 03 SHR: 02 SHRGET IRAB_LNK: 7FF9C958 CHNL: 00C0 FAC: 02 GET ORGCASE: 00 Sequential LAST_FAB: 00081FD0 NWA_PTR: 00000000 IFI: 0002 ECHO_ISI: 0000 FWA_PTR: 7FF9CC00 BDB_FLNK: 7FF9CBB0 DEVBUFSIZ: 00000200 512. BDB_BLNK: 7FF9CB60 RTDEQ: 0000 0. RFMORG: 02 VAR RAT: 02 CR LRL: 004C 76. HBK_DISK: 000C0000 FFB: 0084 132. EBK_DISK: 000C0000 FSZ: 00 0. BKS: 00 0. DEQ: 0000 0. MRS: 0000 0. HBK: 0000000C 12. GBC: 0000 0. EBK: 0000000C LAST_GOOD_EBK: 00000000 0. LAST_GOOD_FFB: 0000 0. RNS_LEN: 00000000 LOCK_BDB: 00000000 . . .

The SHOW PROCESS/RMS command displays RMS data structures for the current SDA process.

#5
SDA> SHOW PROCESS/IMAGES

Process activated images ------------------------ ICB Start End Type Image Name Major ID,Minor ID -------- -------- -------- -------------- ----------------------------- 7FF83878 00000200 00000DFF MAIN SHOW_PROC_IMAGES 0,0 7FF84100 0003AC00 0003FBFF GLOBAL PRT SHR DECW$TRANSPORT_COMMON 12,12 7FF84400 00036200 0003ABFF GLOBAL CONVSHR 1,0 7FF84470 0002E400 000361FF GLOBAL FDLSHR 1,0 7FF84560 00021A00 0002E3FF GLOBAL SORTSHR 2,28 7FF845D0 00000E00 000089FF GLOBAL LIBRTL2 1,12 7FF835F8 00008A00 000219FF GLOBAL SHR LIBRTL 1,14 7FF84800 00060C00 000767FF MERGED SHR ADARTL 0,0 7FF84720 00076800 000A03FF GLOBAL SHR MTHRTL 129,32781 Total images = 9 Pages allocated = 1017

The SHOW PROCESS/IMAGES command displays the address of the image control block, the start and end addresses of the image, the activation code, the protected and shareable flags, the image name, and the major and minor IDs of the image.

#6
SDA> SHOW PROCESS/TRANSACTIONS=(DISPLAY=THREADS, TID=FAC21DE2-BA88-0092-8FA6-B24B)

The SHOW PROCESS command displays the transaction thread information for the transaction whose identifier is FAC21DE2-BA88-0092-8FA6-B24B.

SHOW RESOURCE

Displays information about all resources in the system or about a resource associated with a specific lock.

Format

SHOW RESOURCE {/ALL|/LOCKID=lock-id|/NAME=resource-name}

Parameters

None.

Qualifiers

/ALL
Displays information from all resource blocks (RSBs) in the system. This is the default behavior of the SHOW RESOURCE command.
/LOCKID=lock-id
Displays information about the resource associated with the lock with the specified lock-id.
/NAME=resource-name
Displays information about the resource whose resource name begins with the specified resource-name. For case-sensitive names, enclose resource-name in quotation marks.

Description

The SHOW RESOURCE command displays the information listed in Table SDA-21 for each resource in the system or for the specific resource associated with the specified lock-id.

Table SDA-21 Resource Information in the SHOW RESOURCE Display
Field Contents

Address of RSB Address of the resource block (RSB) that describes this resource.

Parent RSB Address of the RSB that is the parent of this RSB. This field is 00000000 if the RSB itself is a parent block.

Sub-RSB count Number of RSBs of which this RSB is the parent. This field is 0 if the RSB has no sub-RSBs.

Group grant mode Indication of the most restrictive mode in which a lock on this resource has been granted. This field can contain the following values (shown in order from the least restrictive mode to the most restrictive):

NL
Null mode
CR
Concurrent-read mode
CW
Concurrent-write mode
PR
Protected-read mode
PW
Protected-write mode
EX
Exclusive mode

For information about conflicting and incompatible lock modes, see the OpenVMS System Services Reference Manual.

Conversion grant mode Indication of the most restrictive lock mode to which a lock on this resource is waiting to be converted. This does not include the mode for which the lock at the head of the conversion queue is waiting.

BLKAST count Number of locks on this resource that have requested a blocking AST.

Value block Hexadecimal dump of the 16-byte block value block associated with this resource.

Sequence # Sequence number associated with the resource's value block. If the number indicates that the value block is not valid, the words "Not valid" appear to the right of the number.

CSID Cluster system identification number (CSID) of the node that owns the resource.

Resource Dump of the name of this resource, as stored at the end of the RSB. The first two columns are the hexadecimal representation of the name, with the least significant byte represented by the rightmost two digits in the rightmost column. The third column contains the ASCII representation of the name, the least significant byte being represented by the leftmost character in the column. Periods in this column represent values that correspond to nonprinting ASCII characters.

Length Length in bytes of the resource name.

--- Processor mode of the name space in which this RSB resides.

--- Owner of the resource. Certain resources, owned by the operating system, list "System" as the owner. Locks owned by a group have the number (in octal) of the owning group in this field.

Granted queue List of locks on this resource that have been granted. For each lock in the list, SDA displays the number of the lock and the lock mode in which the lock was granted.

Conversion queue List of locks waiting to be converted from one mode to another. For each lock in the list, SDA displays the number of the lock, the mode in which the lock was granted, and the mode to which the lock is to be converted.

Waiting queue List of locks waiting to be granted. For each lock in the list, SDA displays the number of the lock and the mode requested for that lock.

**Table SDA-21 Resource Information in the SHOW RESOURCE Display**
Field	Contents
Address of RSB	Address of the resource block (RSB) that describes this resource.
Parent RSB	Address of the RSB that is the parent of this RSB. This field is 00000000 if the RSB itself is a parent block.
Sub-RSB count	Number of RSBs of which this RSB is the parent. This field is 0 if the RSB has no sub-RSBs.
Group grant mode	Indication of the most restrictive mode in which a lock on this resource has been granted. This field can contain the following values (shown in order from the least restrictive mode to the most restrictive): NL Null mode CR Concurrent-read mode CW Concurrent-write mode PR Protected-read mode PW Protected-write mode EX Exclusive mode For information about conflicting and incompatible lock modes, see the OpenVMS System Services Reference Manual.
Conversion grant mode	Indication of the most restrictive lock mode to which a lock on this resource is waiting to be converted. This does not include the mode for which the lock at the head of the conversion queue is waiting.
BLKAST count	Number of locks on this resource that have requested a blocking AST.
Value block	Hexadecimal dump of the 16-byte block value block associated with this resource.
Sequence #	Sequence number associated with the resource's value block. If the number indicates that the value block is not valid, the words "Not valid" appear to the right of the number.
CSID	Cluster system identification number (CSID) of the node that owns the resource.
Resource	Dump of the name of this resource, as stored at the end of the RSB. The first two columns are the hexadecimal representation of the name, with the least significant byte represented by the rightmost two digits in the rightmost column. The third column contains the ASCII representation of the name, the least significant byte being represented by the leftmost character in the column. Periods in this column represent values that correspond to nonprinting ASCII characters.
Length	Length in bytes of the resource name.
---	Processor mode of the name space in which this RSB resides.
---	Owner of the resource. Certain resources, owned by the operating system, list "System" as the owner. Locks owned by a group have the number (in octal) of the owning group in this field.
Granted queue	List of locks on this resource that have been granted. For each lock in the list, SDA displays the number of the lock and the lock mode in which the lock was granted.
Conversion queue	List of locks waiting to be converted from one mode to another. For each lock in the list, SDA displays the number of the lock, the mode in which the lock was granted, and the mode to which the lock is to be converted.
Waiting queue	List of locks waiting to be granted. For each lock in the list, SDA displays the number of the lock and the mode requested for that lock.

Examples

#1
SDA> SHOW RESOURCE

Resource database ----------------- Address of RSB: 807F6120 Group grant mode: NL Parent RSB: 806EA180 Conversion grant mode: NL Sub-RSB count: 0 BLKAST count: 0 Value block: 806CE510 00000000 00000002 00000002 Seq. #: 00000008 Resource: 09ED7324 42313146 F11B$sí. Length 10 00000000 00000200 ........ CSID: 00020041 Kernel mode 00000000 00000000 ........ System 00000000 00000000 ........ Granted queue (Lock ID / Gr mode): 006801AE NL Conversion queue (Lock ID / Gr/Rq mode): *** EMPTY QUEUE *** Waiting queue (Lock ID / Rq mode): *** EMPTY QUEUE *** Address of RSB: 807EB9E0 Group grant mode: PW Parent RSB: 00000000 Conversion grant mode: EX Sub-RSB count: 0 BLKAST count: 1 Value block: 00000000 00000003 00000000 0000FFF2 Seq. #: 0000027F Not valid Resource: 32245F24 44414853 SHAD$_$2 Length 16 3A31534A 44243435 54$DJS1: CSID: 0002001A Kernel mode 00000000 00000000 ........ System 00000000 00000000 ........ . . .

The SHOW RESOURCE command displays information taken from the RSBs of all resources in the system. For instance, the RSB at 807EB9E0₁₆ is a parent block with no sub-RSBs. The most restrictive lock granted on this resource is in protected-write (PW) mode. There is a lock on the conversion queue waiting to be converted from PW mode to exclusive (EX) mode.

#2
SDA> SHOW PROCESS/LOCKS Process index: 001C Name: STARTQ Extended PID: 4800011C ----------------------------------------------------------- Lock data: Lock id: 0117054F PID: 0001001C Flags: VALBLK SYNCSTS SYSTEM Par. id: 00000000 Granted at PW NOQUOTA Sublocks: 0 LKB: 808091A0 Resource: 45527624 42313146 F11B$vRE Status: NOQUOTA Length 18 20205241 4D323053 S02MAR Kernel mode 00000000 00002020 ...... System 00000000 00000000 ........ Process copy of lock 008209CF on system 0002001 . . . SDA> SHOW RESOURCE/LOCKID=117054F Resource database ----------------- Address of RSB: 806BB050 Group grant mode: NL Parent RSB: 00000000 Conversion grant mode: NL Sub-RSB count: 4 BLKAST count: 0 Value block: 00960102 0000330B 000735AA 5A020005 Seq. #: 00006D9F Resource: 45527624 42313146 F11B$vRE Length 18 20205241 4D323053 S02MAR CSID: 0002001A Kernel mode 00000000 00002020 ...... System 00000000 00000000 ........ Granted queue (Lock ID / Gr mode): 0117054F PW 00060545 CR Conversion queue (Lock ID / Gr/Rq mode): * EMPTY QUEUE * Waiting queue (Lock ID / Rq mode): * EMPTY QUEUE *

SDA>  SHOW PROCESS/LOCKS
  
Process index: 001C   Name: STARTQ   Extended PID: 4800011C
-----------------------------------------------------------
Lock data:
  
Lock id:  0117054F   PID:    0001001C   Flags:   VALBLK  SYNCSTS SYSTEM 
Par. id:  00000000   Granted at    PW            NOQUOTA                 
Sublocks:        0                                                       
LKB:      808091A0            
Resource:      45527624 42313146    F11B$vRE  Status:  NOQUOTA         
 Length   18   20205241 4D323053    S02MAR 
 Kernel mode   00000000 00002020      ......
 System        00000000 00000000    ........
Process copy of lock 008209CF on system 0002001
   .
   .
   .
SDA>  SHOW RESOURCE/LOCKID=117054F
Resource database
-----------------
Address of RSB:  806BB050  Group grant mode:       NL     
Parent RSB:      00000000  Conversion grant mode:  NL      
Sub-RSB count:          4  BLKAST count:            0
Value block:   00960102 0000330B 000735AA 5A020005   Seq. #:  00006D9F  
Resource:      45527624 42313146    F11B$vRE  
 Length   18   20205241 4D323053    S02MAR           CSID:  0002001A
 Kernel mode   00000000 00002020      ......          
 System        00000000 00000000    ........
  
Granted queue (Lock ID / Gr mode):
     0117054F  PW       00060545  CR
  
Conversion queue (Lock ID / Gr/Rq mode):
     *** EMPTY QUEUE ***
  
Waiting queue (Lock ID / Rq mode):
     *** EMPTY QUEUE ***

The SHOW PROCESS/LOCKS command lists all locks associated with the SDA current process, STARTQ. Its display is identical to that of the SHOW LOCK command, illustrated in Table SDA-15. The SHOW RESOURCE/LOCKID=117054F command determines that this particular lock is on the granted queue in protected-write mode for the resource at 806BB050₁₆.

#3
SDA> SHOW RESOURCE/NAME=RMS$ Resource database ----------------- Address of RSB: 80EFBE40 GGMODE: EX Status: DIRENTR VALID Parent RSB: 00000000 CGMODE: EX Sub-RSB count: 2 FGMODE: EX Lock Count: 1 CSID: 00000000 BLKAST count: 1 RQSEQNM: 0000 Resource: 00030014 24534D52 RMS$.... Valblk: 00000000 00000000 Length 26 4D565841 56020000 ...VAXVM 00000000 00000000 Exec. mode 00202035 35305653 SV055 . System 00000000 00000000 ........ Seqnum: 00000000 Granted queue (Lock ID / Gr mode / Range): 6400004C EX 00000000-FFFFFFFF Conversion queue (Lock ID / Gr mode / Range -> Rq mode / Range): * EMPTY QUEUE * Waiting queue (Lock ID / Rq mode / Range): * EMPTY QUEUE * . . .

SDA>  SHOW RESOURCE/NAME=RMS$
Resource database 
----------------- 
 
Address of RSB:  80EFBE40  GGMODE:       EX  Status: DIRENTR VALID           
Parent RSB:      00000000  CGMODE:       EX                                  
Sub-RSB count:          2  FGMODE:       EX                                  
Lock Count:             1  CSID:   00000000                                  
BLKAST count:           1  RQSEQNM:    0000 
 
Resource:      00030014 24534D52   RMS$....  Valblk: 00000000 00000000 
 Length   26   4D565841 56020000   ...VAXVM          00000000 00000000 
 Exec. mode    00202035 35305653   SV055  . 
 System        00000000 00000000   ........  Seqnum: 00000000 
 
Granted queue (Lock ID / Gr mode / Range): 
 6400004C  EX 00000000-FFFFFFFF 
 
Conversion queue (Lock ID / Gr mode / Range -> Rq mode / Range): 
     *** EMPTY QUEUE *** 
 
Waiting queue (Lock ID / Rq mode / Range): 
     *** EMPTY QUEUE *** 
   .
   .
   .

This example of the SHOW RESOURCE/NAME command displays information about the resource whose name begins with RMS$.

SHOW RMS

Displays the RMS data structures selected by the SET RMS command to be included in the default display of the SHOW PROCESS/RMS command.

Format

SHOW RMS

Parameters

None.

Qualifiers

None.

Description

The SHOW RMS command lists the names of the data structures selected for the default display of the SHOW PROCESS/RMS command.
For a description of the significance of the options listed in the SHOW RMS display, see the description of the SET RMS command and Table SDA-14.
For an illustration of the information displayed by the SHOW PROCESS/RMS command, see the examples included in the description of the SHOW PROCESS command.

Examples

#1
SDA> SHOW RMS RMS Display Options: IFB,IRB,IDX,BDB,BDBSUM,ASB,CCB,WCB,FCB,FAB,RAB,NAM, XAB,RLB,BLB,BLBSUM,GBD,GBH,FWA,GBDSUM,JFB,NWA,RU,DRC,SFSB,GBSB Display RMS structures for all IFI values.

The SHOW RMS command displays the full set of options available for display by the SHOW PROCESS/RMS command. SDA, by default, selects the full set of RMS options at the beginning of an analysis.

#2
SDA> SET RMS=(IFB,CCB,WCB) SDA> SHOW RMS RMS Display Options: IFB,CCB,WCB Display RMS structures for all IFI values.

The SET RMS command establishes the IFB, CCB, and WCB as the structures to be displayed when you issue the SHOW PROCESS/RMS command. The SHOW RMS command verifies this selection of RMS options.

SHOW RSPID

Displays information about response IDs (RSPIDs) of all SCS connections or, optionally, a specific SCS connection.

Format

SHOW RSPID [/CONNECTION=cdt-address]

Parameters

None.

Qualifier

/CONNECTION=cdt-address
Displays RSPID information for the specific SCS connection whose connection descriptor table (CDT) address is provided in cdt-address.¹⁴

Description

Whenever a local system application (SYSAP) requires a response from a remote SYSAP, the local system assigns a unique number, called an RSPID, to the response. The RSPID is transmitted in the original request (as a means of identification), and the remote SYSAP returns the same RSPID in its response to the original request.
The SHOW RSPID command displays information taken from the response descriptor table (RDT), which lists the currently open local requests that require responses from SYSAPs at a remote node. For each RSPID, SDA displays the following information:

RSPID value
Address of the class driver request packet (CDRP), which generally represents the original request
Address of the CDT using the RSPID
Name of the local process using the RSPID
Remote node from which a response is required (and has not yet been received)

Examples

#1
SDA> SHOW RSPID

VAXcluster data structures -------------------------- --- Summary of Response Descriptor Table(RDT) 8037A4A8 --- RSPID CDRP Address CDT Address Local Process Name Remote Node ----- ------------ ----------- ------------------ ----------- 04C30000 803917B0 8037AB50 VMS$DISK_CL_DRVR SOWHAT 06260001 80804FA0 8037AF10 VMS$VAXcluster WALKIN 0C390002 807E0460 8037AD30 VMS$VAXcluster OLEO . . .

The SHOW RSPID command shows the response IDs that are currently open for all local connections in the VAXcluster system.

#2
SDA> SHOW RSPID/CONNECTION=G37B7D0

VAXcluster data structures -------------------------- --- Summary of Response Descriptor Table(RDT) 8037A4A8 --- RSPID CDRP Address CDT Address Local Process Name Remote Node ----- ------------ ----------- ------------------ ----------- 08B8001C 807F0300 8037B7D0 VMS$VAXcluster METEOR 0915001D 807F08A0 8037B7D0 VMS$VAXcluster METEOR

The SHOW RSPID/CONNECTION=G37B7D0 command displays only those RSPIDs in use that are associated with the SCS connection whose CDT is at address 8037B7D0₁₆.

Note

¹⁴ You can find the cdt-address for any active connection on the system in the CDT summary page display of the SHOW CONNECTIONS command. CDT addresses are also stored in many individual data structures related to SCS connections. These data structures include class driver request packets (CDRPs) and unit control blocks (UCBs) for class drivers that use SCS and cluster system blocks (CSBs) for the connection manager.

SHOW SPINLOCKS

Displays information taken from the data structures that provide system synchronization in a multiprocessing environment.
The default qualifiers are /STATIC and /DYNAMIC.

Format

SHOW SPINLOCKS [/OWNED][/BRIEF|/FULL][/DYNAMIC|/STATIC] [name|/ADDRESS=expression|/INDEX=expression]

Parameter

name
Name of the spin lock, fork lock, or device lock structure to be displayed. You can obtain the names of the static system spin locks and fork locks from Table SDA-22. Device lock names are of the form [node$]lock, where node optionally indicates the VAXcluster node name (allocation class) and lock indicates the device and controller identification (for example, HAETAR$DUA).

Qualifiers

/ADDRESS=expression
Displays the lock at the address specified in expression. You can use the /ADDRESS qualifier to display a specific device lock; however, the name of the device lock is listed as "Unknown" in the display.
/BRIEF
Produces a condensed display of the lock information displayed by default by the SHOW SPINLOCKS command, including the following: address, spin lock name or device name, IPL or device IPL, rank, index, ownership depth, number of waiting CPUs, CPU ID of the owner CPU, and interlock status (depth of ownership).
/DYNAMIC
Displays information for all device locks in the system.
/FULL
Displays full descriptive and diagnostic information for each displayed spin lock, fork lock, or device lock.
/INDEX=expression
Displays the system spin lock whose index is specified in expression. You cannot use the /INDEX qualifier to display a device lock.
/OWNED
Displays information for all spin locks, fork locks, and device locks owned by the SDA current CPU. If a processor does not own any spin locks, SDA displays the following message:
No spinlocks currently owned by CPU xx
The xx represents the CPU ID of the processor.
/STATIC
Displays information for all system spin locks and fork locks.

Description

The SHOW SPINLOCKS command displays status and diagnostic information about the multiprocessing synchronization structures known as spin locks.
A static spin lock is a spin lock whose data structure is permanently assembled into the system. Static spin locks are accessed as indexes into a vector of longword addresses called the spin lock vector, the address of which is contained in SMP$AR_SPNLKVEC. System spin locks and fork locks are static spin locks. Table SDA-22 lists the static spin locks.
A dynamic spin lock is a spin lock that is created based on the configuration of a particular system. One such dynamic spin lock is the device lock SYSGEN creates when configuring a particular device. This device lock synchronizes access to the device's registers and certain UCB fields. The operating system creates a dynamic spin lock by allocating space from nonpaged pool, rather than assembling the lock into the system as it does in creating a static spin lock.
See the OpenVMS VAX Device Support Manual for a full discussion of the role of spin locks in maintaining synchronization of kernel mode activities in a multiprocessing environment.

Table SDA-22 Static Spin Locks
Name Description

QUEUEAST Fork lock for queuing ASTs at IPL 6

FILSYS Lock on file system structures

IOLOCK8 Fork lock for executing a driver fork process at IPL 8

PR_LK8 Primary CPU's private lock for IPL 8

TIMER Lock for adding and deleting timer queue entries and searching the timer queue

JIB Lock for manipulating job nonpaged pool quotas as reflected by the fields JIB$L_BYTCNT and JIB$L_BYTLM in the job information block (JIB)

MMG Lock on memory management, PFN database, swapper, modified page writer, and creation of per-CPU database structures

SCHED Lock on process control blocks (PCBs), scheduler database, and mutex acquisition and release structures

IOLOCK9 Fork lock for executing a driver fork process at IPL 9

PR_LK9 Primary CPU's private lock for IPL 9

IOLOCK10 Fork lock for executing a driver fork process at IPL 10

PR_LK10 Primary CPU's private lock for IPL 10

IOLOCK11 Fork lock for executing a driver fork process at IPL 11

PR_LK11 Primary CPU's private lock for IPL 11

MAILBOX Lock for sending messages to mailboxes

POOL Lock on nonpaged pool database

PERFMON Lock for I/O performance monitoring

INVALIDATE Lock for system space translation buffer (TB) invalidation

VIRTCONS Lock for ownership of the virtual console

HWCLK Lock on hardware clock database, including the quadword containing the due time of the first timer queue entry (EXE$GQ_1ST_TIME) and the quadword containing the system time (EXE$GQ_SYSTIME)

MEGA Lock for serializing access to fork-wait queue

MCHECK Lock for synchronizing certain machine error handling

EMB Lock for allocating and releasing error logging buffers

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Name	Description
QUEUEAST	Fork lock for queuing ASTs at IPL 6
FILSYS	Lock on file system structures
IOLOCK8	Fork lock for executing a driver fork process at IPL 8
PR_LK8	Primary CPU's private lock for IPL 8
TIMER	Lock for adding and deleting timer queue entries and searching the timer queue
JIB	Lock for manipulating job nonpaged pool quotas as reflected by the fields JIB$L_BYTCNT and JIB$L_BYTLM in the job information block (JIB)
MMG	Lock on memory management, PFN database, swapper, modified page writer, and creation of per-CPU database structures
SCHED	Lock on process control blocks (PCBs), scheduler database, and mutex acquisition and release structures
IOLOCK9	Fork lock for executing a driver fork process at IPL 9
PR_LK9	Primary CPU's private lock for IPL 9
IOLOCK10	Fork lock for executing a driver fork process at IPL 10
PR_LK10	Primary CPU's private lock for IPL 10
IOLOCK11	Fork lock for executing a driver fork process at IPL 11
PR_LK11	Primary CPU's private lock for IPL 11
MAILBOX	Lock for sending messages to mailboxes
POOL	Lock on nonpaged pool database
PERFMON	Lock for I/O performance monitoring
INVALIDATE	Lock for system space translation buffer (TB) invalidation
VIRTCONS	Lock for ownership of the virtual console
HWCLK	Lock on hardware clock database, including the quadword containing the due time of the first timer queue entry (EXE$GQ_1ST_TIME) and the quadword containing the system time (EXE$GQ_SYSTIME)
MEGA	Lock for serializing access to fork-wait queue
MCHECK	Lock for synchronizing certain machine error handling
EMB	Lock for allocating and releasing error logging buffers