Dumping the thread state in Software

Painting Denso QR Bar Code in Software Dumping the thread state
Dumping the thread state
QR Code Encoder In C#.NET
Using Barcode encoder for VS .NET Control to generate, create QR Code image in VS .NET applications.
0:001> ~ 0 Id: 1370fc0 Suspend: 1 Teb: 7ffdf000 Unfrozen 1 Id: 1370101c Suspend: 1 Teb: 7ffde000 Unfrozen
QR Code ISO/IEC18004 Generator In Visual Studio .NET
Using Barcode generator for ASP.NET Control to generate, create QR Code 2d barcode image in ASP.NET applications.
The thread s suspend count represents the value recognized by the Windows kernel, controlled by the SuspendThread and ResumeThread API The suspend count can also be controlled from the debugger using the ~n or ~m command The thread having a <tid> identifier can be suspended by using the following command:
Create QR Code In .NET
Using Barcode maker for Visual Studio .NET Control to generate, create Denso QR Bar Code image in .NET framework applications.
~<tid>n
QR Code Generator In Visual Basic .NET
Using Barcode drawer for .NET Control to generate, create QR Code JIS X 0510 image in .NET framework applications.
The thread having a <tid> identifier can be resumed by using the following command:
Code 3 Of 9 Creator In VB.NET
Using Barcode encoder for .NET framework Control to generate, create Code 39 Extended image in .NET applications.
~<tid>m
GS1 - 12 Drawer In VS .NET
Using Barcode generator for ASP.NET Control to generate, create UPC-A Supplement 5 image in ASP.NET applications.
3 DEBUGGERS UNCOVERED
Create Code 128C In .NET
Using Barcode creator for Visual Studio .NET Control to generate, create USS Code 128 image in .NET applications.
If any such commands are used, as shown in Listing 334, make sure that the suspend count is balanced with the number of resumes commands before detaching the debugger from the process A suspended thread remains suspended forever It is also important to understand the side effect of suspending a particular thread for the
Data Matrix ECC200 Drawer In C#
Using Barcode printer for VS .NET Control to generate, create DataMatrix image in .NET applications.
3
Decode Code 39 Full ASCII In VS .NET
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in VS .NET applications.
Debuggers Uncovered
UPC A Encoder In VS .NET
Using Barcode creation for .NET framework Control to generate, create UPC A image in .NET framework applications.
entire process For example, most graphic user interface applications use a single thread to retrieve and dispatch windows messages corresponding to user interactions Suspending that thread practically freezes the whole application Suspending a thread that owns a resource causes all other threads waiting on the same resource to block until the thread is resumed As before, this unbound wait is perceived as an application hung Listing 334
Paint Data Matrix In .NET Framework
Using Barcode generator for ASP.NET Control to generate, create Data Matrix 2d barcode image in ASP.NET applications.
How to suspend and resume threads
Encoding Bar Code In Java
Using Barcode creation for Java Control to generate, create bar code image in Java applications.
0:001> * Suspend the thread zero 0:001> ~0n 0:001> ~ 0 Id: 1370fc0 Suspend: 2 Teb: 7ffdf000 Unfrozen 1 Id: 1370101c Suspend: 1 Teb: 7ffde000 Unfrozen 0:001> * Resume the thread zero 0:001> ~0m 0:001> ~ 0 Id: 1370fc0 Suspend: 1 Teb: 7ffdf000 Unfrozen 1 Id: 1370101c Suspend: 1 Teb: 7ffde000 Unfrozen
Generate GS1 128 In Java
Using Barcode generation for Java Control to generate, create UCC-128 image in Java applications.
The Frozen/Unfrozen state discussed previously is different from the suspend state described in the preceding section The Frozen state is a pure debugger concept without support from the Windows operating system For each frozen thread, the debugger remembers that state and increases its suspend count before resuming debugger event processing The suspend count is later decreased when the new event is processed, so the suspend count looks unchanged The thread having a <tid> identifier can be frozen by using the following command:
UPCA Encoder In Java
Using Barcode generator for Java Control to generate, create UPC-A Supplement 2 image in Java applications.
~<tid>f
Barcode Recognizer In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
The thread having a <tid> identifier can be unfrozen by using the following command:
Decoding Code 128 Code Set C In .NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in .NET applications.
~<tid>u
Barcode Creation In .NET Framework
Using Barcode encoder for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Listing 335 shows an example of each command in action Because a frozen thread impacts the normal process execution, the debugger reminds the user about the number of frozen threads each time a new event is processed The freeze commands must be matched by unfreeze commands, in the same way as suspend-resume commands Interestingly enough, when the last running thread in the process is frozen, the debugger terminates the target process, as there are minimal chances for any further activity to happen in that process
Barcode Encoder In Java
Using Barcode generator for Java Control to generate, create barcode image in Java applications.
Controlling the Target
Generating Code 128 Code Set B In Java
Using Barcode generation for Java Control to generate, create Code 128C image in Java applications.
Listing 335
Encoding Code39 In Java
Using Barcode maker for Java Control to generate, create Code 39 image in Java applications.
How to freeze or unfreeze threads
0:001> * Freeze thread number one 0:001> ~1f 0:001> * Dump thread status 0:001> ~ 0 Id: 10981418 Suspend: 1 Teb: 7ffdf000 Unfrozen 1 Id: 1098143c Suspend: 1 Teb: 7ffde000 Frozen 0:001> * Let the debugger target run 0:001> g System 0: 1 of 2 threads are frozen System 0: 1 of 3 threads were frozen System 0: 1 of 3 threads are frozen System 0: 1 of 3 threads were frozen (109815fc): Break instruction exception - code 80000003 (first chance) eax=7ffd9000 ebx=00000001 ecx=00000002 edx=00000003 esi=00000004 edi=00000005 eip=7c901230 esp=0092ffcc ebp=0092fff4 iopl=0 nv up ei pl zr na po nc cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000 efl=00000246 ntdll!DbgBreakPoint: 7c901230 cc int 3 0:001> * Unfreeze thread number one 0:002> ~1u 0:001> * Dump thread status 0:002> ~ 0 Id: 10981418 Suspend: 1 Teb: 7ffdf000 Unfrozen 1 Id: 1098143c Suspend: 1 Teb: 7ffde000 Unfrozen 2 Id: 109815fc Suspend: 1 Teb: 7ffdd000 Unfrozen
Last, the debugger offers the capability to replace the current executing thread with any other thread within the process This change is a temporary one, and it is in effect until the new thread loses the execution quantum by either execution preemption, by voluntary releasing the remaining of the execution quantum time, or by entering a wait state As you can see in Listing 336, the current thread has a dot () in front of the thread identifier If the current thread is different from the active thread (the thread generating the current event), the active thread is marked with a pound sign (#) in front of the thread identifier The thread having the <tid> identifier can be made the active thread by using the following command: