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<concept id="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A" xml:lang="en"><title>Kernel

State Information Commands</title><shortdesc>Describes how to use the <codeph>i</codeph> command to get detailed

information on the current process, thread, user process, user thread, and

the state of the kernel. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>The output shown below is a typical result of using the <xref href="GUID-08E14B34-5144-5AA8-AA55-7AF03671676C.dita#GUID-08E14B34-5144-5AA8-AA55-7AF03671676C/GUID-D0175D78-6F84-5F4F-BA90-2C591B473C69">i</xref> command, and we use this to illustrate how information can be extracted

about the: </p>

<ul>

<li id="GUID-FCDEBC28-363F-539C-BCF7-C472ED279C5A"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-D64C53F4-78D4-51FC-B7DD-27E10B435CFD">Scheduler state</xref>  </p> </li>

<li id="GUID-12616D76-643A-5814-833A-0C3CDD92BD97"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-31DF5393-FD03-56B7-B5F2-1F6DBD86D7C4">Current thread state</xref>  </p> </li>

<li id="GUID-EF2FF4EC-7F11-5F72-BEC3-7F25762889F3"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-2424E413-F2F3-5625-932D-515860911424">Current process state</xref>  </p> </li>

<li id="GUID-4B3694AB-AB36-5AEC-A514-CB858F5EFEB0"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-877907D5-6A04-510B-AE99-C3856A0469E7">Current data section process</xref>  </p> </li>

</ul>

<codeblock id="GUID-8ACEF4EF-0C02-50A9-8E2B-EB3917E9B726" xml:space="preserve">SCHEDULER @64000348: CurrentThread 640396b0

RescheduleNeeded=00 DfcPending=00 KernCSLocked=00000001

DFCS: next 64000458 prev 64000458

ProcessHandler=f8014904, AddressSpace=64038d5c

SYSLOCK: HoldingThread 00000000 iWaiting 00000000

Extras 0: 64038d5c 1: 64038d5c 2: 64038d5c 3: 00000000

Extras 4: 00000000 5: 00000000 6: 00000000 7: 00000000

Extras 8: 00000000 9: 00000000 A: 00000000 B: 00000000

Extras C: 00000000 D: 00000000 E: 00000000 F: 00000000

TheCurrentThread=64039408

THREAD at 64039408 VPTR=f803423c AccessCount=3 Owner=64038d5c

Full name test2.exe::Main

Thread MState READY

Default priority 16 WaitLink Priority 16

ExitInfo 2,100,USER

Flags 00000004, Handles 640330bc

Supervisor stack base 6571f000 size 1000

User stack base 00402000 size 2000

Id=26, Alctr=00600000, Created alctr=00600000, Frame=00000000

Trap handler=00000000, ActiveScheduler=00000000, Exception handler=00000000

TempObj=00000000 TempAlloc=00000000 IpcCount=00000000

NThread @ 640396b0 Pri 16 NState READY

Next=640396b0 Prev=640396b0 Att=03 iUserContextType=0b

HeldFM=00000000 WaitFM=00000000 AddrSp=64038d5c

Time=17 Timeslice=20 ReqCount=0

SuspendCount=0 CsCount=1 CsFunction=fffffffe

SavedSP=6571ff34 ExtraContext=00000000 ExtraContextSize=0000

DACR 63990000

R13_USR 6571ff88 R14_USR f8025bc0 SPSR_SVC 10000004

 R4 f8033794  R5 64039408  R6 640396b0  R7 f8028518

 R8 640396b0  R9 640396b0 R10 00000000 R11 f80284d8

 PC 00000000

TheCurrentProcess=64038d5c

PROCESS at 64038d5c VPTR=f80342a4 AccessCount=6 Owner=00000000

Full name test2.exe

ExitInfo 3,0,

Flags a0000000, Handles 6403860c, Attributes 60010000

DataBssChunk 64039234, CodeSeg 6403919c

DllLock 64039044, Process Lock 64038eec SID 00000000

TempCodeSeg 00000000 CodeSeg 6403919c Capability 00000000 0003ffff

CodeSegs: Count=0

NumChunks=2

0: Chunk 64039234, run 00400000, access count 1

1: Chunk 6403613c, run 00600000, access count 1

Process shared IO buffers cookie 0000031d

Process has no shared IO buffers

Domain -1, DACR 55555507

TheCurrentAddressSpace=64038d5c

TheCurrentVMProcess=64038d5c

PROCESS at 64038d5c VPTR=f80342a4 AccessCount=6 Owner=00000000

Full name test2.exe

ExitInfo 3,0,

Flags a0000000, Handles 6403860c, Attributes 60010000

DataBssChunk 64039234, CodeSeg 6403919c

DllLock 64039044, Process Lock 64038eec SID 00000000

TempCodeSeg 00000000 CodeSeg 6403919c Capability 00000000 0003ffff

CodeSegs: Count=0

NumChunks=2

0: Chunk 64039234, run 00400000, access count 1

1: Chunk 6403613c, run 00600000, access count 1

Process shared IO buffers cookie 0000031d

Process has no shared IO buffers

Domain -1, DACR 55555507

TheCurrentDataSectionProcess=64038d5c

TheCompleteDataSectionProcess=64038d5c

PROCESS at 64038d5c VPTR=f80342a4 AccessCount=6 Owner=00000000

Full name test2.exe

ExitInfo 3,0,

Flags a0000000, Handles 6403860c, Attributes 60010000

DataBssChunk 64039234, CodeSeg 6403919c

DllLock 64039044, Process Lock 64038eec SID 00000000

TempCodeSeg 00000000 CodeSeg 6403919c Capability 00000000 0003ffff

CodeSegs: Count=0

NumChunks=2

0: Chunk 64039234, run 00400000, access count 1

1: Chunk 6403613c, run 00600000, access count 1

Process shared IO buffers cookie 0000031d

Process has no shared IO buffers

Domain -1, DACR 55555507

</codeblock>

<section id="GUID-D64C53F4-78D4-51FC-B7DD-27E10B435CFD"><title>Scheduler state</title> <p>The

first three lines and the fifth line of the output show the state of the kernel

scheduler. This information is mainly of interest to kernel engineers, although

the state of the kernel and the system locks can be useful when debugging

device driver crashes. </p> <codeblock id="GUID-D21A9A99-C956-5276-AEE1-3609CE72DB6E" xml:space="preserve">SCHEDULER @64000348: CurrentThread 640396b0

RescheduleNeeded=00 DfcPending=00 KernCSLocked=00000001

DFCS: next 64000458 prev 64000458

...

SYSLOCK: HoldingThread 00000000 iWaiting 00000000

</codeblock> <p>The values are interpreted as follows: </p> <table id="GUID-E13DE258-ACD5-5EEB-AFC7-988747AA3863">

<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/>

<tbody>

<row>

<entry><p> <codeph>SCHEDULER @</codeph>  </p> </entry>

<entry><p>This is the address of the kernel’s scheduler instance; this is

not very useful. </p> </entry>

</row>

<row>

<entry><p> <codeph>CurrentThread</codeph>  </p> </entry>

<entry><p>The address of the kernel object for the current kernel thread. </p> </entry>

</row>

<row>

<entry><p> <codeph>RescheduleNeeded</codeph>  </p> </entry>

<entry><p>This is set to non-zero by the kernel to force a reschedule, for

example if a thread has been signalled </p> </entry>

</row>

<row>

<entry><p> <codeph>DfcPending</codeph>  </p> </entry>

<entry><p>This is non-zero when there are DFCs queued. </p> </entry>

</row>

<row>

<entry><p> <codeph>KernCSLocked</codeph>  </p> </entry>

<entry><p>This is incremented each time the kernel is locked by a call to <xref href="GUID-3A3C08F3-3D33-3D9E-80E7-7855C7B21E02.dita#GUID-3A3C08F3-3D33-3D9E-80E7-7855C7B21E02/GUID-7CBBF72B-4519-38DD-92CA-38AF636AFD8A"><apiname>NKern::Lock()</apiname></xref>,

and decremented by calls to <xref href="GUID-3A3C08F3-3D33-3D9E-80E7-7855C7B21E02.dita#GUID-3A3C08F3-3D33-3D9E-80E7-7855C7B21E02/GUID-A1A42137-906C-30F1-AF61-4F786FC372DE"><apiname>NKern::Unlock()</apiname></xref>. A value of

zero means that the kernel is not locked. </p> </entry>

</row>

<row>

<entry><p> <codeph>DFCS:</codeph>  </p> </entry>

<entry><p>The addresses of the next and the previous items on the DFC queue </p> </entry>

</row>

<row>

<entry><p> <codeph>HoldingThread</codeph>  </p> </entry>

<entry><p>The address of the thread holding the system lock mutex. The system

lock is set by call to <xref href="GUID-3A3C08F3-3D33-3D9E-80E7-7855C7B21E02.dita#GUID-3A3C08F3-3D33-3D9E-80E7-7855C7B21E02/GUID-B3837744-B8CC-3DC0-BA1D-417016E88EE9"><apiname>NKern::LockSystem()</apiname></xref> and unset by

call to <xref href="GUID-3A3C08F3-3D33-3D9E-80E7-7855C7B21E02.dita#GUID-3A3C08F3-3D33-3D9E-80E7-7855C7B21E02/GUID-63B882C8-C5D0-3595-BBF1-74E942A5060A"><apiname>NKern::UnlockSystem()</apiname></xref>  </p> </entry>

</row>

<row>

<entry><p> <codeph>iWaiting</codeph>  </p> </entry>

<entry><p>Non-zero, if any thread is waiting for the system lock mutex. </p> </entry>

</row>

</tbody>

</tgroup>

</table> </section>

<section id="GUID-31DF5393-FD03-56B7-B5F2-1F6DBD86D7C4"><title>Current thread

state</title> <p>The current thread is the thread that was executing when

the fault occurred. The 23 lines starting at line 10 of the output gives information

relating to the current thread: </p> <codeblock id="GUID-2AB3CE2B-3428-5CFD-8480-FE33B07972C3" xml:space="preserve">TheCurrentThread=64039408

THREAD at 64039408 VPTR=f803423c AccessCount=3 Owner=64038d5c

Full name test2.exe::Main

Thread MState READY

Default priority 16 WaitLink Priority 16

ExitInfo 2,100,USER

Flags 00000004, Handles 640330bc

Supervisor stack base 6571f000 size 1000

User stack base 00402000 size 2000

Id=26, Alctr=00600000, Created alctr=00600000, Frame=00000000

Trap handler=00000000, ActiveScheduler=00000000, Exception handler=00000000

TempObj=00000000 TempAlloc=00000000 IpcCount=00000000

NThread @ 640396b0 Pri 16 NState READY

Next=640396b0 Prev=640396b0 Att=03 iUserContextType=0b

HeldFM=00000000 WaitFM=00000000 AddrSp=64038d5c

Time=17 Timeslice=20 ReqCount=0

SuspendCount=0 CsCount=1 CsFunction=fffffffe

SavedSP=6571ff34 ExtraContext=00000000 ExtraContextSize=0000

DACR 63990000

R13_USR 6571ff88 R14_USR f8025bc0 SPSR_SVC 10000004

 R4 f8033794  R5 64039408  R6 640396b0  R7 f8028518

 R8 640396b0  R9 640396b0 R10 00000000 R11 f80284d8

 PC 00000000</codeblock> <ul>

<li id="GUID-0CEB1586-DB4D-5390-AEB8-987681EA07B2"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-38E186F9-73E3-5A15-9AAF-3CEFCDC0540B">Thread object and access count</xref>  </p> </li>

<li id="GUID-48F79826-183C-5EE0-9B00-FB1D0B66040D"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-73FCD8C6-089B-54E1-A6CA-798DAC33B6DF">The thread name</xref>  </p> </li>

<li id="GUID-75A20FEF-7C66-567C-A774-657065912FF3"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-2581D5E1-6CA2-55AC-ABD9-9E67AF4AE692">The thread state, exit information, priority</xref>  </p> </li>

<li id="GUID-DA7CBB15-0537-5116-8026-F0873AB537F9"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-58B010AF-587A-556D-B831-B083C5BC11EE">Thread flags</xref>  </p> </li>

<li id="GUID-B7DA3F70-5CC8-538D-A2ED-F98EB30D8577"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-026A5C10-C2F5-564A-B5CC-AE2B76A144A9">Handles</xref>  </p> </li>

<li id="GUID-6820DE1D-5109-555B-9BF3-F9FF55507393"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-033C939E-BA01-5FC4-AD77-17FD891FE724">Kernel &amp; user stack addresses</xref>  </p> </li>

<li id="GUID-6FA4EFD8-AE98-5E73-AF5D-8BC202419EB8"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-595813CE-C13C-5E27-9016-63A9FEA393C0">Thread id, RAllocator instances, trap frame</xref>  </p> </li>

<li id="GUID-0144EA8F-E1A8-5F3C-9826-FC4642135FE0"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-71901B6F-6BBF-5DCC-8F3F-DC601DB21543">Trap handler, active scheduler and user-side exception handler</xref>  </p> </li>

<li id="GUID-1FCA2909-CE38-5DE8-A5EA-4A4516D6BBA2"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-62666275-C252-5EE0-B3F5-21F65600AD1D">Temporary object, temporary allocation, IPC count</xref>  </p> </li>

<li id="GUID-5A1CC314-6891-53DA-AF5E-1E4DE0598E4B"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-6C42738E-2644-5064-B349-B48266BF286D">Underlying nanokernel thread</xref>  </p> </li>

<li id="GUID-3F5BD294-813F-595D-93DF-802C9A1E519D"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-3C1A2A53-E2BE-5959-9F2D-C63400F6AABA">Fast mutexes</xref>  </p> </li>

<li id="GUID-70CC2F58-E3FC-59D5-A645-AD27BC3C184C"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-36E24838-15FB-5A69-9122-7AFF98F219AE">Timing, request semaphore count</xref>  </p> </li>

</ul> <p id="GUID-38E186F9-73E3-5A15-9AAF-3CEFCDC0540B"><b>Thread object and access

count</b> </p> <codeblock id="GUID-15EEA149-76AF-57BD-A67D-4337020933E8" xml:space="preserve">THREAD at 64039408 VPTR=f803423c AccessCount=3 Owner=64038d5c</codeblock> <p>The <codeph>THread at</codeph> field contains a pointer to the <codeph>DThread</codeph> object

representing the thread. </p> <p>The <codeph>AccessCount</codeph> field contains

the reference count on the thread object. </p> <p>The <codeph>owner</codeph> field

contains a pointer to the object that owns this <codeph>DThread</codeph> object. </p> <p id="GUID-73FCD8C6-089B-54E1-A6CA-798DAC33B6DF"><b>The thread name</b> </p> <codeblock id="GUID-05E008EE-375F-51D0-B738-42A978B167E4" xml:space="preserve">Full name test2.exe::Main</codeblock> <p>The

thread name is the part after the colons. The part before the colons is the

process name. This means that the thread is called <b>Main</b> inside the

process <b>test2.exe</b>. </p> <p id="GUID-2581D5E1-6CA2-55AC-ABD9-9E67AF4AE692"><b>The thread state, exit information,

priority</b> </p> <codeblock id="GUID-FCFE05EE-FE8B-514D-9EC9-44C14A5DE700" xml:space="preserve">Thread MState READY

Default priority 16 WaitLink Priority 16

ExitInfo 2,100,USER</codeblock> <p>The information that characterises the

thread exit is described by <codeph>ExitInfo</codeph>; this is shown as exit

type, exit reason and exit category. In this example: </p> <ul>

<li id="GUID-E9CE2364-F8B2-5990-8AFD-94BDD0C9782A"><p>the thread has panicked,

as indicated by: <b>exit type 2</b>; See also <xref href="GUID-0296BFC6-7F7C-3259-AF21-7E9B5C304B24.dita"><apiname>TExitType</apiname></xref>. </p> </li>

<li id="GUID-96DACA09-4212-5E6C-8834-53F5B4EE6A82"><p>the panic category was: <b>USER</b>  </p> </li>

<li id="GUID-1077CDFF-4C1D-5256-8A32-FA4B6118541A"><p>the panic number was:<b>100</b>  </p> </li>

<li id="GUID-E42997ED-A327-57BC-BA7B-0D6EEA8BEA95"><p>the thread was running

or it was in a ready-to-run state: <b>MState READY</b>  </p> </li>

</ul> <p>The priority shown is for the underlying thread, see also <xref href="GUID-49379616-C235-598D-AE43-668998AD072B.dita#GUID-49379616-C235-598D-AE43-668998AD072B/GUID-4D7F6A1F-3120-5547-B027-344C08A01D83">Process and thread priorities</xref>. </p> <p id="GUID-58B010AF-587A-556D-B831-B083C5BC11EE"><b>Thread flags</b> </p> <codeblock id="GUID-7D1F17F6-ED74-5A3A-9214-D85B91D52CC4" xml:space="preserve">Flags 00000004, Handles 640330bc</codeblock> <p>The <codeph>Flags</codeph> field

contains information about the state of the thread. The possible values in

this field are defined by the <codeph>KThread...</codeph> constants in <filepath>u32std.h</filepath>.

While the symbols are internal to Symbian platform, the following table summarises

the values and their meaning. </p> <table id="GUID-46D4FB94-284B-5415-8E8A-54EED6C4E37F">

<tgroup cols="3"><colspec colname="col0"/><colspec colname="col1"/><colspec colname="col2"/>

<tbody>

<row>

<entry><p> <b>Symbol</b>  </p> </entry>

<entry><p> <b>Value</b>  </p> </entry>

<entry><p> <b>Meaning</b>  </p> </entry>

</row>

<row>

<entry><p> <codeph>KThreadFlagProcessCritical</codeph>  </p> </entry>

<entry><p> <codeph>0x00000001</codeph>  </p> </entry>

<entry><p>A thread panic causes the process to panic. </p> </entry>

</row>

<row>

<entry><p> <codeph>KThreadFlagProcessPermanent</codeph>  </p> </entry>

<entry><p> <codeph>0x00000002</codeph>  </p> </entry>

<entry><p>If the thread exits for any reason, then this causes the process

to exit. </p> </entry>

</row>

<row>

<entry><p> <codeph>KThreadFlagSystemCritical</codeph>  </p> </entry>

<entry><p> <codeph>0x00000004</codeph>  </p> </entry>

<entry><p>If the thread panics, then this causes the entire system to reboot. </p> </entry>

</row>

<row>

<entry><p> <codeph>KThreadFlagSystemPermanent</codeph>  </p> </entry>

<entry><p> <codeph>0x00000008</codeph>  </p> </entry>

<entry><p>If the thread exits for any reason, then this causes the entire

system to reboot. </p> </entry>

</row>

<row>

<entry><p> <codeph>KThreadFlagOriginal</codeph>  </p> </entry>

<entry><p> <codeph>0x00000010</codeph>  </p> </entry>

<entry><p>Reserved for future use. </p> </entry>

</row>

<row>

<entry><p> <codeph>KThreadFlagLastChance</codeph>  </p> </entry>

<entry><p> <codeph>0x00000020</codeph>  </p> </entry>

<entry><p>Set if the thread is currently handling an exception. </p> </entry>

</row>

</tbody>

</tgroup>

</table> <p id="GUID-026A5C10-C2F5-564A-B5CC-AE2B76A144A9"><b>Handles</b> </p> <codeblock id="GUID-8FF13D5A-D4F2-5B04-B306-B91DB54AA4C3" xml:space="preserve">Flags 00000004, Handles 640330bc</codeblock> <p>The <codeph>Handles</codeph> field

contains the address of a <codeph>DObjectIx</codeph> object that contains

the handles owned by the thread. </p> <p id="GUID-033C939E-BA01-5FC4-AD77-17FD891FE724"><b>Kernel &amp; user stack

addresses</b> </p> <codeblock id="GUID-FA6F4E36-AC78-5518-B82A-82AB7BE9BA9A" xml:space="preserve">Supervisor stack base 6571f000 size 1000

User stack base 00402000 size 2000

</codeblock> <p>These fields give the base address and size, in bytes, of

the kernel and user stacks respectively. </p> <p id="GUID-595813CE-C13C-5E27-9016-63A9FEA393C0"><b>Thread id, RAllocator instances,

trap frame</b> </p> <codeblock id="GUID-E28677AC-E286-5043-AFE7-7E775D836A3A" xml:space="preserve">Id=26, Alctr=00600000, Created alctr=00600000, Frame=00000000</codeblock> <p>The <codeph>Id</codeph> field contains the thread id. </p> <p>The <codeph>Alctr</codeph> field

contains a pointer to the current <xref href="GUID-9DB4A58C-6FC8-3292-A547-4C161BD188FC.dita"><apiname>RAllocator</apiname></xref> instance used

for heap allocation. </p> <p>The <codeph>Created alctr</codeph> field contains

a pointer to the original <xref href="GUID-9DB4A58C-6FC8-3292-A547-4C161BD188FC.dita"><apiname>RAllocator</apiname></xref> instance used for

heap allocation. This may be different from the current instance if <xref href="GUID-C197C9A7-EA05-3F24-9854-542E984C612D.dita#GUID-C197C9A7-EA05-3F24-9854-542E984C612D/GUID-988B1323-D1E2-33DE-923A-A987F2CAFBB7"><apiname>User::SwitchAllocator()</apiname></xref> has

been called. </p> <p>The <codeph>Frame</codeph> field contains a pointer to

the current trap frame, an instance of the <codeph>TTrap</codeph> class, on

the cleanup stack. </p> <p id="GUID-71901B6F-6BBF-5DCC-8F3F-DC601DB21543"><b>Trap handler, active scheduler,

user-side exception handler</b> </p> <codeblock id="GUID-21E4E26F-9F2F-5BC2-9324-0988A50CD376" xml:space="preserve">Trap handler=00000000, ActiveScheduler=00000000, Exception handler=00000000</codeblock> <p>The <codeph>Trap handler</codeph> field contains a pointer to the current

trap handler, an instance of <xref href="GUID-1C6ED16E-2105-3C17-81C7-026D211DCCC0.dita"><apiname>TTrapHandler</apiname></xref>, for the cleanup

stack. </p> <p>The <codeph>ActiveScheduler</codeph> field contains a pointer

to the current active scheduler. </p> <p>The <codeph>Exception handler</codeph> field

contains a pointer to the current user-side exception handler. </p> <p id="GUID-62666275-C252-5EE0-B3F5-21F65600AD1D"><b>Temporary object, temporary

allocation, IPC count</b> </p> <codeblock id="GUID-DCBEBEBE-35FD-57EE-9A8B-DEF0C59A4042" xml:space="preserve">TempObj=00000000 TempAlloc=00000000 IpcCount=00000000</codeblock> <p>The <codeph>Tempobj</codeph> field contains a pointer to an instance

of a <xref href="GUID-E48F1435-14B6-37F1-BE47-2EA803AFE497.dita"><apiname>DObject</apiname></xref> derived class that must be closed when the

thread terminates. </p> <p>The <codeph>TempAlloc</codeph> field contains a

pointer to a kernel heap cell that must be freed when the thread terminates.

Both this and <codeph>Tempobj</codeph> are used to avoid leaks if the thread

terminates unexpectedly. </p> <p>The <codeph>IpcCount</codeph> field contains

the number of messages currently queued to this thread. </p> <p id="GUID-6C42738E-2644-5064-B349-B48266BF286D"><b>Underlying nanokernel thread</b> </p> <codeblock id="GUID-6A4598D5-CD52-54C5-B314-8DF7AD14F4A9" xml:space="preserve">NThread @ 640396b0 Pri 16 NState READY

Next=640396b0 Prev=640396b0 Att=03 iUserContextType=0b</codeblock> <p>The <codeph>NThread</codeph> field

contains a pointer to the underlying nanokernel thread object, an instance

of the <xref href="GUID-187D314F-1115-3671-AC46-37AEC5DFB2AC.dita"><apiname>NThread</apiname></xref> class. </p> <p>The <codeph>Pri</codeph> field

contains the current priority of the underlying nanokernel thread. </p> <p>The <codeph>NState</codeph> field

shows the current state of the underlying nanokernel thread. Note that this

state is often referred to as the N-state, as compared to the to M-state,

the state of a Symbian platform thread. See the <xref href="GUID-49379616-C235-598D-AE43-668998AD072B.dita#GUID-49379616-C235-598D-AE43-668998AD072B/GUID-DDC45F0A-6B62-5EE6-9E42-D21F07BCF4B4">Thread

state summary</xref>. </p> <p>The <codeph>Next</codeph> field points to the

next nanokernel thread object. </p> <p>The <codeph>Prev</codeph> field points

to the previous nanokernel thread object. </p> <p>The <codeph>Att</codeph> field

contains the nanokernel thread attributes, which is an 8-bit mask that controls

how the thread is scheduled in certain cases. Two attributes are defined: </p> <table id="GUID-A241F528-3E55-504B-ACD8-F33AAB7F0D87">

<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/>

<tbody>

<row>

<entry><p> <codeph> KThreadAttImplicitSystemLock</codeph>  </p> </entry>

<entry><p>This attribute signifies that the thread may not be scheduled if

another thread currently holds the system lock, unless the the former thread

holds another fast mutex. This attribute is used in implementing address space

switching in the moving memory model and also in implementing change of user

context in order to allow exceptions to be raised on other threads. </p> </entry>

</row>

<row>

<entry><p> <codeph>KThreadAttAddressSpace</codeph>  </p> </entry>

<entry><p>This attribute signifies that the thread may require a change of

address space to schedule it. This attribute is used in conjunction with the

thread’s <codeph>iAddressSpace</codeph> field; if this does not match the

scheduler’s <codeph>iAddressSpace</codeph> field at the point where the thread

is scheduled an address space switch will occur. Note that this is not required

if the address space change is limited to the ARM domain permissions since

these are saved and restored as part of the thread context. </p> </entry>

</row>

</tbody>

</tgroup>

</table> <p id="GUID-3C1A2A53-E2BE-5959-9F2D-C63400F6AABA"><b>Fast mutexes</b> </p> <codeblock id="GUID-09E41C50-99C1-56CC-AD16-2A5C1A47104B" xml:space="preserve">HeldFM=00000000 WaitFM=00000000 AddrSp=64038d5c</codeblock> <p>The <codeph>HeldFM</codeph> field

contains a pointer to the fast mutex held by this thread; this is NULL if

no fast mutext was held. </p> <p>The <codeph>WaitFM</codeph> field contains

a pointer to the fast mutex that this thread was waiting on; this is NULL

if this thread was not waiting on a fast mutex. </p> <p>The <codeph>AddrSp</codeph> field

is the address space identifier used by the scheduler to determine whether

an address space change is required when scheduling in a new thread. </p> <p id="GUID-36E24838-15FB-5A69-9122-7AFF98F219AE"><b>Timing, request semaphore

count</b> </p> <codeblock id="GUID-486FAC6A-5FE5-5937-8E15-FA526E65BDE6" xml:space="preserve">Time=17 Timeslice=20 ReqCount=0</codeblock> <p>The <codeph>Time</codeph> field

contains the number of nanokernel ticks, usually in milliseconds, to go before

the thread is preempted. </p> <p>The <codeph>Timeslice</codeph> field contains

the maximum number of ticks for which the thread can run before being preempted. </p> <p>The <codeph>ReqCount</codeph> contains

the request semaphore counter. If the value is negative, then the thread is

blocked waiting for a request to complete; if it is positive, then one or

more requests have completed. </p> <p id="GUID-BE914CFE-EE27-5661-A8E5-E85E897E880B"><b>Suspend count, critical

section counter, register values</b> </p> <codeblock id="GUID-2F12508F-70D3-5F74-AC62-3BCAA1E00C69" xml:space="preserve">SuspendCount=0 CsCount=1 CsFunction=fffffffe

SavedSP=6571ff34 ExtraContext=00000000 ExtraContextSize=0000

DACR 63990000

R13_USR 6571ff88 R14_USR f8025bc0 SPSR_SVC 10000004

 R4 f8033794  R5 64039408  R6 640396b0  R7 f8028518

 R8 640396b0  R9 640396b0 R10 00000000 R11 f80284d8

 PC 00000000

</codeblock> <p>The <codeph>SuspendCount</codeph> field contains the number

of times that the thread has been suspended. </p> <p>The <codeph>CsCount</codeph> field

critical section counter. When this value is greater than zero, then the thread

is in a critical section and cannot be suspended or killed. </p> <p>The remaining

content is a list of register values. <i>Note that they are not the register

values when the thread panicked.</i> They are the values in the registers

the last time that this thread was pre-empted. </p> </section>

<section id="GUID-2424E413-F2F3-5625-932D-515860911424"><title>Current process

state</title> <p>The current process is the process in whose address space

the current thread was executing when the fault occurred. The 15 lines starting

at line 33 of the output gives information relating to the current process.

This has some similarities with the current thread information: </p> <codeblock id="GUID-9A11F0D0-6939-5EB5-8CA0-D8501699563B" xml:space="preserve">TheCurrentProcess=64038d5c

PROCESS at 64038d5c VPTR=f80342a4 AccessCount=6 Owner=00000000

Full name test2.exe

ExitInfo 3,0,

Flags a0000000, Handles 6403860c, Attributes 60010000

DataBssChunk 64039234, CodeSeg 6403919c

DllLock 64039044, Process Lock 64038eec SID 00000000

TempCodeSeg 00000000 CodeSeg 6403919c Capability 00000000 0003ffff

CodeSegs: Count=0

NumChunks=2

0: Chunk 64039234, run 00400000, access count 1

1: Chunk 6403613c, run 00600000, access count 1

Process shared IO buffers cookie 0000031d

Process has no shared IO buffers

Domain -1, DACR 55555507</codeblock> <ul>

<li id="GUID-958232EF-0C57-5BE8-B7FD-9CE32E8868BA"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-C34D3FEF-E3F9-5123-9F30-40DBDA77C64C">Process object and access count</xref>  </p> </li>

<li id="GUID-883E0C90-C62A-556B-8F7C-8A94EBBBCACD"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-BFACCA5F-FE1A-5580-9A1A-6FF79D60C7C2">The process name</xref>  </p> </li>

<li id="GUID-9F8C813C-A45E-5CF6-8ED7-10F9C684A2EA"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-F229C034-2497-5F64-B2D2-8C677731BA2C">Exit information</xref>  </p> </li>

<li id="GUID-D2C617EB-D70E-5847-8E27-ADF85BBD781E"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-6758C73B-BC11-59FC-9836-E8853665AF47">Process flags</xref>  </p> </li>

<li id="GUID-93008AC0-CA9C-5663-BD48-BC57B767F030"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-026A5C10-C2F5-564A-B5CC-AE2B76A144A9">Handles</xref>  </p> </li>

<li id="GUID-8D9F7DCE-E8E2-5414-87FE-21272BFAF590"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-41734978-89CD-5B5D-8361-2F74378ADB63">Attributes</xref> </p> </li>

<li id="GUID-AA619815-2474-5741-93DD-F5734C2B5617"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-9A4BB007-9B90-51A4-BEA7-FC7108031C6A">Information about memory</xref>  </p> </li>

<li id="GUID-52E95BE0-1123-544C-ADD4-CE087107EEF7"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-BCFE81CD-1E22-58F9-9370-7CA7EFD4B505">Secure id</xref>  </p> </li>

<li id="GUID-053B4284-3873-56DA-9CC3-FC2C3E869E09"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-FF5194C1-B2AB-5665-B9DE-EF4AB08BEA3F">Capability</xref> </p> </li>

<li id="GUID-05E35250-1EE3-5FF5-8622-51B24025FBC6"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-5F4276A9-7EDC-5D5C-840A-06A3EC1903CC">Code segments</xref>  </p> </li>

<li id="GUID-45F0E651-1154-565C-AB4D-6ECA1AA7A7EC"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-E4C48F4E-6EF9-5937-A8DA-6DFA1968557E">Chunks owned by the process</xref>  </p> </li>

<li id="GUID-73763927-40A9-5B34-B702-3FE90F56219C"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-2D147ABB-E9D7-540C-BC98-CB0E9E4B89FF">Shared IO buffer information</xref>  </p> </li>

<li id="GUID-226E15CD-5382-51E6-B65D-8DA4DBD7CE4F"><p> <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-9CB0F4F8-C3E9-5108-AB7E-B23057C48BA4">Domain information</xref>  </p> </li>

</ul> <p id="GUID-C34D3FEF-E3F9-5123-9F30-40DBDA77C64C"><b>Process object and access

count</b> </p> <codeblock id="GUID-33CB81C9-8585-5C75-8F5C-2F1D897BA5F9" xml:space="preserve">PROCESS at 64038d5c VPTR=f80342a4 AccessCount=6 Owner=00000000</codeblock> <p>The <codeph>Process at</codeph> field contains a pointer to the <codeph>DProcess</codeph> object

representing the process. </p> <p>The <codeph>AccessCount</codeph> field contains

the reference count on the process object. </p> <p>The <codeph>owner</codeph> field

contains a pointer to the object that owns this <codeph>DProcess</codeph> object. </p> <p id="GUID-BFACCA5F-FE1A-5580-9A1A-6FF79D60C7C2"><b>The process name</b> </p> <codeblock id="GUID-FD1903A5-AC86-59CE-BCC5-EC9E434DD5F8" xml:space="preserve">Full name test2.exe</codeblock> <p>The <codeph>Full

name</codeph> field gives the name of the process. In this example, the name

of the process is <b>test2.exe</b>. </p> <p>See <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-73FCD8C6-089B-54E1-A6CA-798DAC33B6DF">the

thread name</xref>. </p> <p id="GUID-F229C034-2497-5F64-B2D2-8C677731BA2C"><b>Exit information</b> </p> <codeblock id="GUID-101BECBC-D613-5928-AB4E-70D292FBFDA7" xml:space="preserve">ExitInfo 3,0,</codeblock> <p>The <codeph>ExitInfo</codeph> field

contains the information that characterises the process exit. In this example,

the value is 3, meaning that this process has not exited. See also <xref href="GUID-0296BFC6-7F7C-3259-AF21-7E9B5C304B24.dita"><apiname>TExitType</apiname></xref>. </p> <p id="GUID-6758C73B-BC11-59FC-9836-E8853665AF47"><b>Process flags</b> </p> <codeblock id="GUID-163D2DFD-F5AF-594F-A618-A6795DBE88DC" xml:space="preserve">Flags a0000000, Handles 6403860c, Attributes 60010000</codeblock> <p>The <codeph>Flags</codeph> field

contains information about the state of the process. The possible values in

this field are defined by the <codeph>KProcess...</codeph> constants in <filepath>u32std.h</filepath>.

While the symbols are internal to Symbian platform, the following

table summarises the values and their meaning. </p> <table id="GUID-1913BCFB-93DD-58F5-B603-2B44A21C4621">

<tgroup cols="3"><colspec colname="col0"/><colspec colname="col1"/><colspec colname="col2"/>

<tbody>

<row>

<entry><p> <b>Symbol</b>  </p> </entry>

<entry><p> <b>Value</b>  </p> </entry>

<entry><p> <b>Meaning</b>  </p> </entry>

</row>

<row>

<entry><p> <codeph>KProcessFlagSystemCritical</codeph>  </p> </entry>

<entry><p> <codeph>0x00000004</codeph>  </p> </entry>

<entry><p>A process panic causes the entire system to reboot. </p> </entry>

</row>

<row>

<entry><p> <codeph>KProcessFlagSystemPermanent</codeph>  </p> </entry>

<entry><p> <codeph>0x00000008</codeph>  </p> </entry>

<entry><p>If the process exits for any reason, then this causes the entire

system to reboot. </p> </entry>

</row>

<row>

<entry><p> <codeph>KProcessFlagPriorityControl</codeph>  </p> </entry>

<entry><p> <codeph> 0x40000000</codeph>  </p> </entry>

<entry><p>If set, then other threads are allowed to change this thread’s priority. </p> </entry>

</row>

<row>

<entry><p> <codeph>KProcessFlagJustInTime</codeph>  </p> </entry>

<entry><p> <codeph>0x80000000</codeph>  </p> </entry>

<entry><p>If set, then just-in-time debug is enabled for this thread. </p> </entry>

</row>

</tbody>

</tgroup>

</table> <p id="GUID-1969D689-9BDD-5564-BA08-5424534EE1F2"><b>Handles</b> </p> <codeblock id="GUID-1DEFC9E1-7597-51DB-AF9A-3690F5D69507" xml:space="preserve">Flags a0000000, Handles 6403860c, Attributes 60010000</codeblock> <p>The <codeph>Handles</codeph> field

contains the address of a <codeph>DObjectIx</codeph> object that contains

the handles owned by the process. </p> <p id="GUID-41734978-89CD-5B5D-8361-2F74378ADB63"><b>Attributes</b> </p> <codeblock id="GUID-D526B23E-67A6-5667-A7E0-3761D83D84FA" xml:space="preserve">Flags a0000000, Handles 6403860c, Attributes 60010000</codeblock> <p>The <codeph>Attributes</codeph> field contains the attributes of the process. Some are generic, as defined

by <xref href="GUID-5B2E4FFA-8E41-3D62-A386-11BFD3EBB436.dita#GUID-5B2E4FFA-8E41-3D62-A386-11BFD3EBB436/GUID-6B8684BC-CDCB-3A01-9937-FF20FB613FE6"><apiname>DProcess::TProcessAttributes</apiname></xref>, but others depend on the

memory model. </p> <p id="GUID-9A4BB007-9B90-51A4-BEA7-FC7108031C6A"><b>Information about memory</b> </p> <codeblock id="GUID-3361448E-5135-5C20-B6D0-133885565EB8" xml:space="preserve">DataBssChunk 64039234, CodeSeg 6403919c</codeblock> <p>The <codeph>DataBssChunk</codeph> field

contains a pointer to the <codeph>DChunk</codeph> object representing the

chunk that contains the process data and <codeph>.bss</codeph> memory. Be

aware that this is not the same as the heap - heaps are allocated to threads,

and chunk information is found in the <codeph>DThread</codeph> object. </p> <p>The <codeph>CodeSeg</codeph> field

contains a pointer to the <codeph>DCodeSeg</codeph> object that represents

the code segment. </p> <p id="GUID-BCFE81CD-1E22-58F9-9370-7CA7EFD4B505"><b>Secure id</b> </p> <codeblock id="GUID-0DF422C0-D066-5A3C-A5CE-EF86F312D6D8" xml:space="preserve">DllLock 64039044, Process Lock 64038eec SID 00000000</codeblock> <p>The <codeph>SID</codeph> field

contains the secure id of the process. </p> <p id="GUID-FF5194C1-B2AB-5665-B9DE-EF4AB08BEA3F"><b>Capability</b> </p> <codeblock id="GUID-2C600784-5877-572C-8D7B-5362C6B25998" xml:space="preserve">TempCodeSeg 00000000 CodeSeg 6403919c Capability 00000000 0003ffff</codeblock> <p>The

second four bytes of the Capability field contains the set of bits that define

the capability for this process. This defines what the process can and cannot

do. </p> <p id="GUID-5F4276A9-7EDC-5D5C-840A-06A3EC1903CC"><b>Code segments</b> </p> <codeblock id="GUID-E2E5055C-0C98-533C-AC64-B12AFF22EC20" xml:space="preserve">CodeSegs: Count=0</codeblock> <p>The <codeph>CodeSegs:

Count</codeph> field contains the number of code segments that have been dynamically

loaded into the process. This will be zero if the process is XIP. </p> <p id="GUID-E4C48F4E-6EF9-5937-A8DA-6DFA1968557E"><b>Chunks owned by the process</b> </p> <codeblock id="GUID-CA07A45D-8905-55DA-A1B3-140C6B318B82" xml:space="preserve">NumChunks=2

0: Chunk 64039234, run 00400000, access count 1

1: Chunk 6403613c, run 00600000, access count 1

</codeblock> <p>The NumChunks field contains the number of chunks owned by

the process. </p> <p>Successive lines contain information about each chunk: </p> <ul>

<li id="GUID-632AEB6C-FF47-5139-A6E6-79DAF1E25214"><p>the <codeph>Chunk</codeph> field

contains the address of a kernel <codeph>DChunk</codeph> object. </p> </li>

<li id="GUID-7E0EA444-2FE0-56D2-AEF5-CA31DAD1A165"><p>the <codeph>run</codeph> field

contains the virtual address at which the chunk resides when this is the current

process. </p> </li>

<li id="GUID-8472FA34-1569-52A3-ABC1-951115A7FA4E"><p>the <codeph>access count</codeph> field

contains the reference count of the object. </p> </li>

</ul> <p id="GUID-2D147ABB-E9D7-540C-BC98-CB0E9E4B89FF"><b>Shared IO buffer information</b> </p> <codeblock id="GUID-05E4BBE9-CA87-5123-BD2C-49B10DE56295" xml:space="preserve">Process shared IO buffers cookie 0000031d

Process has no shared IO buffers

</codeblock> <p>This is information about shared IO buffers. The cookie is

only really of interest to base engineers. </p> <p id="GUID-9CB0F4F8-C3E9-5108-AB7E-B23057C48BA4"><b>Domain information</b> </p> <codeblock id="GUID-43108D24-448E-5D94-BD4C-D62B59F52633" xml:space="preserve">Domain -1, DACR 55555507</codeblock> <p>This

is ARM MMU-specific protection information. Processes have domain -1 and DACR

0xFFFFFFFF. </p> </section>

<section id="GUID-877907D5-6A04-510B-AE99-C3856A0469E7"><title>Current data

section process</title> <p>In the moving memory model the current process

could be a fixed process, in which case there is also a current moving process.

The current data section process is the current moving process. </p> <codeblock id="GUID-4E0FA397-16BF-581C-93FD-0D10BAE7B1B3" xml:space="preserve">TheCurrentDataSectionProcess=64038d5c</codeblock> <p>This

field contains a pointer to the <codeph>DProcess</codeph> object for the current

moving process. This line is followed by detailed information about the process

itself; the format is the same as that described for the <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita#GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A/GUID-2424E413-F2F3-5625-932D-515860911424">Current process state</xref>. </p> </section>