The !threadfields extension displays the names and offsets of the fields within the executive thread (ETHREAD) block.



Windows 2000


Windows XP and later

Unavailable (see the Remarks section)

Additional Information

For information about the ETHREAD block, see Microsoft Windows Internals, by Mark Russinovich and David Solomon. (This book may not be available in some languages and countries.)


This extension command is not available in Windows XP or later versions of Windows. Instead, use the dt (Display Type) command to show the ETHREAD structure directly:

kd> dt nt!_ETHREAD 

Here is an example of !threadfields from a Windows 2000 system:

kd> !threadfields
 ETHREAD structure offsets:

    Tcb:                           0x0
    CreateTime:                    0x1b0
    ExitTime:                      0x1b8
    ExitStatus:                    0x1c0
    PostBlockList:                 0x1c4
    TerminationPortList:           0x1cc
    ActiveTimerListLock:           0x1d4
    ActiveTimerListHead:           0x1d8
    Cid:                           0x1e0
    LpcReplySemaphore:             0x1e8
    LpcReplyMessage:               0x1fc
    LpcReplyMessageId:             0x200
    ImpersonationInfo:             0x208
    IrpList:                       0x20c
    TopLevelIrp:                   0x214
    ReadClusterSize:               0x21c
    ForwardClusterOnly:            0x220
    DisablePageFaultClustering:    0x221
    DeadThread:                    0x222
    HasTerminated:                 0x224
    GrantedAccess:                 0x228
    ThreadsProcess:                0x22c
    StartAddress:                  0x230
    Win32StartAddress:             0x234
    LpcExitThreadCalled:           0x238
    HardErrorsAreDisabled:         0x239

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