| author | fturovic <frank.turovich@nokia.com> |
| Thu, 25 Feb 2010 12:00:19 -0600 | |
| changeset 1024 | 48b401835d0a |
| parent 0 | fb279309251b |
| permissions | -rw-r--r-- |
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" |
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"http://www.w3.org/TR/html4/loose.dtd"> |
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<html><head> |
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<title>Current Thread State</title> |
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<link href="sysdoc-eclipse.css" type="text/css" rel="stylesheet" media="screen"> |
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<link href="sysdoc-eclipse.css" type="text/css" rel="stylesheet" media="print"> |
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<link href="../../book.css" type="text/css" rel="stylesheet" > |
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<style type="text/css"> |
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<!-- |
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.style14 {font-weight: bold}
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--> |
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</style> |
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<div class="Head1"> |
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<h2>Current Thread State</h2> |
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</div> |
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<div> |
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<p>The current thread is the thread that was executing when the fault |
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occurred. The 23 lines starting at line 10 of the output gives information |
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relating to the current thread:</p> |
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<p class="listing">TheCurrentThread=64039408<br> |
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THREAD at 64039408 VPTR=f803423c AccessCount=3 Owner=64038d5c<br>Full name test2.exe::Main<br>Thread MState READY<br>Default priority 16 WaitLink Priority 16<br>ExitInfo 2,100,USER<br>Flags 00000004, Handles 640330bc<br>Supervisor stack base 6571f000 size 1000<br>User stack base 00402000 size 2000<br>Id=26, Alctr=00600000, Created alctr=00600000, Frame=00000000<br>Trap handler=00000000, ActiveScheduler=00000000, Exception handler=00000000<br>TempObj=00000000 TempAlloc=00000000 IpcCount=00000000<br>NThread @ 640396b0 Pri 16 NState READY<br>Next=640396b0 Prev=640396b0 Att=03 iUserContextType=0b<br>HeldFM=00000000 WaitFM=00000000 AddrSp=64038d5c<br>Time=17 Timeslice=20 ReqCount=0<br>SuspendCount=0 CsCount=1 CsFunction=fffffffe<br>SavedSP=6571ff34 ExtraContext=00000000 ExtraContextSize=0000<br>DACR 63990000<br>R13_USR 6571ff88 R14_USR f8025bc0 SPSR_SVC 10000004<br> |
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R4 f8033794 R5 64039408 R6 640396b0 R7 f8028518<br> |
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R8 640396b0 R9 640396b0 R10 00000000 R11 f80284d8<br> |
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PC 00000000</p> |
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<ul> |
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<li> |
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<p><b><a href="CrashDebuggerInfoAboutKernel.guide03.html" title="Extracting information about the kernel / Current thread state / Thread object and access count">Thread object and access count</a></b></p> |
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</li> |
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<li class="style14"> |
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<p><a href="CrashDebuggerInfoAboutKernel.guide03.html#debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2ename" title="Extracting information about the kernel / Current thread state / The thread name">The thread name</a></p> |
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</li> |
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<li class="style14"> |
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<p><a href="CrashDebuggerInfoAboutKernel.guide03.html#debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2estate" title="Extracting information about the kernel / Current thread state / The thread state, exit information, priority">The thread state, exit information, priority</a></p> |
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</li> |
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<li class="style14"> |
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<p><a href="CrashDebuggerInfoAboutKernel.guide03.html#debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2eflags" title="Extracting information about the kernel / Current thread state / Thread flags">Thread flags</a></p> |
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</li> |
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<li class="style14"> |
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<p><a href="CrashDebuggerInfoAboutKernel.guide03.html#debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2ehandles" title="Extracting information about the kernel / Current thread state / Handles">Handles</a></p> |
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</li> |
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<li class="style14"> |
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<p><a href="CrashDebuggerInfoAboutKernel.guide03.html#debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2estack%2dadrs" title="Extracting information about the kernel / Current thread state / Kernel & user stack addresses">Kernel & user stack addresses</a></p> |
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</li> |
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<li class="style14"> |
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<p><a href="CrashDebuggerInfoAboutKernel.guide03.html#debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2ethreadid" title="Extracting information about the kernel / Current thread state / Thread id, RAllocator instances, trap frame">Thread id, RAllocator instances, trap frame</a></p> |
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</li> |
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<li class="style14"> |
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<p><a href="CrashDebuggerInfoAboutKernel.guide03.html#debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2etrap%2dhandler" title="Extracting information about the kernel / Current thread state / Trap handler, active scheduler, user-side exception handler">Trap handler, active scheduler and user-side exception handler</a></p> |
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</li> |
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<li class="style14"> |
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<p><a href="CrashDebuggerInfoAboutKernel.guide03.html#debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2etemp" title="Extracting information about the kernel / Current thread state / Temporary object, temporary allocation, IPC count">Temporary object, temporary allocation, IPC count</a></p> |
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</li> |
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<li class="style14"> |
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<p><a href="CrashDebuggerInfoAboutKernel.guide03.html#debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2enthread" title="Extracting information about the kernel / Current thread state / Underlying nanokernel thread">Underlying nanokernel thread</a></p> |
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</li> |
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<li class="style14"> |
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<p><a href="CrashDebuggerInfoAboutKernel.guide03.html#debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2efast%2dmutexes" title="Extracting information about the kernel / Current thread state / Fast mutexes">Fast mutexes</a></p> |
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</li> |
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<li> |
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<p><b><a href="CrashDebuggerInfoAboutKernel.guide03.html#debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2etiming" title="Extracting information about the kernel / Current thread state / Timing, request semaphore count">Timing, request semaphore count</a></b></p> |
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</li> |
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</ul> |
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</div> |
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<div class="Head3"> |
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<h3><span class="Bodytext"><a name="debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2ethread%2dobject"></a></span>Thread object and access count</h3> |
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</div><div> |
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<p class="CodeBlock">THREAD at 64039408 VPTR=f803423c AccessCount=3 Owner=64038d5c</p> |
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<p>The THread at field contains a pointer to the |
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DThread object representing the thread.</p> |
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<p>The AccessCount field contains the reference count |
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on the thread object.</p> |
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<p>The owner field contains a pointer to the object |
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that owns this DThread object.</p> |
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</div> |
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<div class="Head3"> |
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<h3><span class="Bodytext"><a name="debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2ename"></a></span>The thread name</h3> |
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</div><div> |
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<p class="CodeBlock">Full name test2.exe::Main</p> |
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<p>The thread name is the part after the colons. The part before the |
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colons is the process name. This means that the thread is called |
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<b>Main</b> inside the process <b>test2.exe</b>.</p> |
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</div> |
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<div class="Head3"> |
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<h3><span class="Bodytext"><a name="debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2estate"></a></span>The thread state, exit information, priority</h3> |
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</div><div> |
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<p class="CodeBlock">Thread MState READY<br>Default priority 16 WaitLink Priority 16<br>ExitInfo 2,100,USER</p> |
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<p>The information that characterises the thread exit is described |
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by ExitInfo; this is shown as exit type, exit reason and exit |
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category. In this example:</p> |
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<ul> |
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<li> |
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<p>the thread has panicked, as indicated by: <b>exit type |
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2</b>; See also TExitType.</p> |
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</li> |
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<li> |
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100 |
<p>the panic category was: <b>USER</b></p> |
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101 |
</li> |
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102 |
<li> |
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103 |
<p>the panic number was:<b>100</b></p> |
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104 |
</li> |
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|
105 |
<li> |
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106 |
<p>the thread was running or it was in a ready-to-run state: |
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<b>MState READY</b></p> |
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108 |
</li> |
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109 |
</ul> |
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<p>The priority shown is for the underlying thread, see also |
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<a href="CrashDebugger_cmd_m.guide.html" title="Process, thread, stack and memory useful information / Process and thread priorities">Process and thread priorities</a>.</p> |
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112 |
|
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113 |
</div> |
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114 |
<div class="Head3"> |
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<h3><span class="Bodytext"><a name="debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2eflags"></a></span>Thread flags</h3> |
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</div><div> |
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<p class="CodeBlock">Flags 00000004, Handles 640330bc</p> |
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<p>The Flags field contains information about the state |
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of the thread. The possible values in this field are defined by the |
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KThread... constants in u32std.h. While the symbols |
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are internal to Symbian OS, the following table summarises the values and their |
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meaning.</p> |
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<table cellpadding="1" border="0" cellspacing="0"><tr><td |
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class="TableWrap"><table cellpadding="5" cellspacing="1" |
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125 |
border="0"><tr valign="top"><td class="Cell"> |
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<p><b>Symbol</b></p></td><td class="Cell"> |
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<p><b>Value</b></p></td><td class="Cell"> |
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<p><b>Meaning</b></p></td></tr> |
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129 |
<tr valign="top"><td class="Cell"> |
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<p>KThreadFlagProcessCritical</p></td><td class="Cell"> |
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<p>0x00000001</p></td><td class="Cell"> |
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<p>A thread panic causes the process to |
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panic.</p></td></tr> |
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134 |
<tr valign="top"><td class="Cell"> |
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<p>KThreadFlagProcessPermanent</p></td><td class="Cell"> |
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<p>0x00000002</p></td><td class="Cell"> |
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<p>If the thread exits for any reason, then this causes the |
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process to exit.</p></td></tr> |
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139 |
<tr valign="top"><td class="Cell"> |
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<p>KThreadFlagSystemCritical</p></td><td class="Cell"> |
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<p>0x00000004</p></td><td class="Cell"> |
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<p>If the thread panics, then this causes the entire system to |
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reboot.</p></td></tr> |
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144 |
<tr valign="top"><td class="Cell"> |
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<p>KThreadFlagSystemPermanent</p></td><td class="Cell"> |
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<p>0x00000008</p></td><td class="Cell"> |
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147 |
<p>If the thread exits for any reason, then this causes the |
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148 |
entire system to reboot.</p></td></tr> |
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149 |
<tr valign="top"><td class="Cell"> |
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<p>KThreadFlagOriginal</p></td><td class="Cell"> |
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<p>0x00000010</p></td><td class="Cell"> |
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<p>Reserved for future use.</p></td></tr> |
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153 |
<tr valign="top"><td class="Cell"> |
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<p>KThreadFlagLastChance</p></td><td class="Cell"> |
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<p>0x00000020</p></td><td class="Cell"> |
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<p>Set if the thread is currently handling an |
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exception.</p></td></tr> |
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158 |
</table></td></tr></table> |
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159 |
|
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</div> |
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161 |
<div class="Head3"> |
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<h3><span class="Bodytext"><a name="debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2ehandles"></a></span>Handles</h3> |
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</div><div> |
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<p class="CodeBlock">Flags 00000004, Handles 640330bc</p> |
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<p>The Handles field contains the address of a |
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DObjectIx object that contains the handles owned by the |
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thread.</p> |
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168 |
|
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169 |
</div> |
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170 |
<div class="Head3"> |
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171 |
<h3><span class="Bodytext"><a name="debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2estack%2dadrs"></a></span>Kernel & user stack addresses</h3> |
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172 |
</div><div> |
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<p class="CodeBlock">Supervisor stack base 6571f000 size 1000<br>User stack base 00402000 size 2000</p> |
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<p>These fields give the base address and size, in bytes, of the |
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kernel and user stacks respectively.</p> |
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176 |
|
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177 |
</div> |
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178 |
<div class="Head3"> |
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<h3><span class="Bodytext"><a name="debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2ethreadid"></a></span>Thread id, RAllocator instances, trap frame</h3> |
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</div><div> |
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<p class="CodeBlock">Id=26, Alctr=00600000, Created alctr=00600000, Frame=00000000</p> |
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<p>The Id field contains the thread id.</p> |
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<p>The Alctr field contains a pointer to the current RAllocator instance used for heap allocation.</p> |
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184 |
<p>The Created alctr field contains a pointer to the |
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original RAllocator instance used for heap allocation. |
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This may be different from the current instance if User::SwitchAllocator() has been called.</p> |
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<p>The Frame field contains a pointer to the current |
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trap frame, an instance of the TTrap class, on the cleanup |
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189 |
stack.</p> |
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190 |
|
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191 |
</div> |
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192 |
<div class="Head3"> |
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193 |
<h3><span class="Bodytext"><a name="debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2etrap%2dhandler"></a></span>Trap handler, active scheduler, user-side exception |
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194 |
handler</h3> |
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195 |
</div><div> |
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<p class="CodeBlock">Trap handler=00000000, ActiveScheduler=00000000, Exception handler=00000000</p> |
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<p>The Trap handler field contains a pointer to the |
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current trap handler, an instance of TTrapHandler, for the |
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cleanup stack.</p> |
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<p>The ActiveScheduler field contains a pointer to the |
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current active scheduler.</p> |
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<p> The Exception handler field contains a pointer to |
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the current user-side exception handler.</p> |
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204 |
|
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</div> |
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<div class="Head3"> |
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207 |
<h3><span class="Bodytext"><a name="debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2etemp"></a></span>Temporary object, temporary allocation, IPC |
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208 |
count</h3> |
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209 |
</div><div> |
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<p class="CodeBlock">TempObj=00000000 TempAlloc=00000000 IpcCount=00000000</p> |
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<p>The Tempobj field contains a pointer to an instance |
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of a DObject derived class that must be closed when the |
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thread terminates.</p> |
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<p>The TempAlloc field contains a pointer to a kernel |
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heap cell that must be freed when the thread terminates. Both this and |
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Tempobj are used to avoid leaks if the thread terminates |
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unexpectedly.</p> |
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<p>The IpcCount field contains the number of messages |
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currently queued to this thread.</p> |
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</div> |
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<div class="Head3"> |
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<h3><span class="Bodytext"><a name="debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2enthread"></a></span>Underlying nanokernel thread</h3> |
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</div><div> |
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<p class="CodeBlock">NThread @ 640396b0 Pri 16 NState READY<br>Next=640396b0 Prev=640396b0 Att=03 iUserContextType=0b</p> |
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<p>The NThread field contains a pointer to the |
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underlying nanokernel thread object, an instance of the |
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NThread class.</p> |
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<p>The Pri field contains the current priority of the |
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underlying nanokernel thread.</p> |
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<p> The NState field shows the current state of the |
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underlying nanokernel thread. Note that this state is often referred to as the |
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N-state, as compared to the to M-state, the state of a Symbian OS thread. See |
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the <a href="CrashDebugger_cmd_m.guide.html" title="Process, thread, stack and memory useful information / Thread state summary">Thread state summary</a>.</p> |
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<p>The Next field points to the next nanokernel thread |
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object.</p> |
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<p>The Prev field points to the previous nanokernel |
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thread object.</p> |
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<p>The Att field contains the nanokernel thread |
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attributes, which is an 8-bit mask that controls how the thread is scheduled in |
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certain cases. Two attributes are defined:</p><table cellpadding="1" border="0" cellspacing="0"><tr><td |
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class="TableWrap"><table cellpadding="5" cellspacing="1" |
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border="0"><tr valign="top"><td class="Cell"> |
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<p> KThreadAttImplicitSystemLock</p></td><td class="Cell"> |
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<p> This attribute signifies that the thread may not be |
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scheduled if another thread currently holds the system lock, unless the the |
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former thread holds another fast mutex. This attribute is used in implementing |
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address space switching in the moving memory model and also in implementing |
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change of user context in order to allow exceptions to be raised on other |
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threads.</p></td></tr><tr valign="top"><td class="Cell"> |
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<p>KThreadAttAddressSpace</p></td><td class="Cell"> |
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<p>This attribute signifies that the thread may require a |
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change of address space to schedule it. This attribute is used in conjunction |
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with the thread’s iAddressSpace field; if this does not match the |
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scheduler’s iAddressSpace field at the point where the thread is |
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scheduled an address space switch will occur. Note that this is not required if |
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the address space change is limited to the ARM domain permissions since these |
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are saved and restored as part of the thread context.</p></td></tr></table></td></tr></table> |
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259 |
|
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</div> |
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<div class="Head3"> |
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<h3><span class="Bodytext"><a name="debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2efast%2dmutexes"></a></span>Fast mutexes</h3> |
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</div><div> |
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<p class="CodeBlock">HeldFM=00000000 WaitFM=00000000 AddrSp=64038d5c</p> |
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<p>The HeldFM field contains a pointer to the fast |
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mutex held by this thread; this is NULL if no fast mutext was held.</p> |
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<p>The WaitFM field contains a pointer to the fast |
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mutex that this thread was waiting on; this is NULL if this thread was not |
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waiting on a fast mutex.</p> |
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<p>The AddrSp field is the address space identifier |
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used by the scheduler to determine whether an address space change is required |
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when scheduling in a new thread.</p> |
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273 |
|
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</div> |
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<div class="Head3"> |
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<h3><span class="Bodytext"><a name="debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2etiming"></a></span>Timing, request semaphore count</h3> |
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277 |
</div><div> |
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<p class="CodeBlock">Time=17 Timeslice=20 ReqCount=0</p> |
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<p>The Time field contains the number of nanokernel |
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ticks, usually in milliseconds, to go before the thread is preempted.</p> |
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<p>The Timeslice field contains the maximum number of |
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ticks for which the thread can run before being preempted.</p> |
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<p>The ReqCount contains the request semaphore counter. |
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If the value is negative, then the thread is blocked waiting for a request to |
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complete; if it is positive, then one or more requests have completed.</p> |
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286 |
|
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</div><div class="Head3"> |
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<h3><span class="Bodytext"><a name="debugging%2einfo%2dabout%2dkernel%2ethread%2dstate%2esuspend"></a></span>Suspend count, critical section counter, register |
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values</h3> |
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</div> |
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<div> |
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<p class="CodeBlock">SuspendCount=0 CsCount=1 CsFunction=fffffffe<br>SavedSP=6571ff34 ExtraContext=00000000 ExtraContextSize=0000<br>DACR 63990000<br>R13_USR 6571ff88 R14_USR f8025bc0 SPSR_SVC 10000004<br> R4 f8033794 R5 64039408 R6 640396b0 R7 f8028518<br> R8 640396b0 R9 640396b0 R10 00000000 R11 f80284d8<br> PC 00000000</p> |
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<p>The SuspendCount field contains the number of times |
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that the thread has been suspended.</p> |
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<p>The CsCount field critical section counter. When |
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this value is greater than zero, then the thread is in a critical section and |
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cannot be suspended or killed.</p> |
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<p>The remaining content is a list of register values. <em>Note |
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that they are not the register values when the thread panicked.</em> They are |
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the values in the registers the last time that this thread was |
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pre-empted.</p> |
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</div> |
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<h5>Related tasks</h5> |
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<ul> |
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<li><a href="CrashDebuggerInfoAboutKernel.guide.html">Extracting Kernel Information</a> </li> |
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<li><a href="CrashDebuggerInfoAboutKernel.guide02.html">Scheduler State</a></li> |
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<li><a href="CrashDebuggerInfoAboutKernel.guide04.html">Current Process State</a></li> |
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<li><a href="CrashDebuggerInfoAboutKernel.guide05.html">Current Data Section Process</a></li> |
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</ul> |
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<div id="footer">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. <br>License: <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a></div> |
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</body> |
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</html> |
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