typedef struct _KTHREAD {

    //
    // The dispatcher header and mutant listhead are fairly infrequently
    // referenced.
    //

    DISPATCHER_HEADER Header;
    LIST_ENTRY MutantListHead;

    //
    // The following fields are referenced during context switches and wait
    // operatings. They have been carefully laid out to get the best cache
    // hit ratios.
    //

    PVOID InitialStack;
    PVOID StackLimit;
    PVOID KernelStack;

    KSPIN_LOCK ThreadLock;
    union {
        KAPC_STATE ApcState;
        struct {
            UCHAR ApcStateFill[KAPC_STATE_ACTUAL_LENGTH];
            BOOLEAN ApcQueueable;
            volatile UCHAR NextProcessor;
            volatile UCHAR DeferredProcessor;
            UCHAR AdjustReason;
            SCHAR AdjustIncrement;
        };
    };

    KSPIN_LOCK ApcQueueLock;

#if !defined(_AMD64_)

    ULONG ContextSwitches;
    volatile UCHAR State;
    UCHAR NpxState;
    KIRQL WaitIrql;
    KPROCESSOR_MODE WaitMode;

#endif

    LONG_PTR WaitStatus;
    union {
        PKWAIT_BLOCK WaitBlockList;
        PKGATE GateObject;
    };

    BOOLEAN Alertable;
    BOOLEAN WaitNext;
    UCHAR WaitReason;
    SCHAR Priority;
    UCHAR EnableStackSwap;
    volatile UCHAR SwapBusy;
    BOOLEAN Alerted[MaximumMode];
    union {
        LIST_ENTRY WaitListEntry;
        SINGLE_LIST_ENTRY SwapListEntry;
    };

    PRKQUEUE Queue;

#if !defined(_AMD64_)

    ULONG WaitTime;
    union {
        struct {
            SHORT KernelApcDisable;
            SHORT SpecialApcDisable;
        };

        ULONG CombinedApcDisable;
    };

#endif

    PVOID Teb;
    union {
        KTIMER Timer;
        struct {
            UCHAR TimerFill[KTIMER_ACTUAL_LENGTH];

            //
            // N.B. The following bit number definitions must match the
            //      following bit field.
            //
            // N.B. These bits can only be written with interlocked
            //      operations.
            //
    
#define KTHREAD_AUTO_ALIGNMENT_BIT 0
#define KTHREAD_DISABLE_BOOST_BIT 1
    
            union {
                struct {
                    LONG AutoAlignment : 1;
                    LONG DisableBoost : 1;
                    LONG ReservedFlags : 30;
                };
        
                LONG ThreadFlags;
            };
        };
    };

    union {
        KWAIT_BLOCK WaitBlock[THREAD_WAIT_OBJECTS + 1];
        struct {
            UCHAR WaitBlockFill0[KWAIT_BLOCK_OFFSET_TO_BYTE0];
            BOOLEAN SystemAffinityActive;
        };

        struct {
            UCHAR WaitBlockFill1[KWAIT_BLOCK_OFFSET_TO_BYTE1];
            CCHAR PreviousMode;
        };

        struct {
            UCHAR WaitBlockFill2[KWAIT_BLOCK_OFFSET_TO_BYTE2];
            UCHAR ResourceIndex;
        };

        struct {
            UCHAR WaitBlockFill3[KWAIT_BLOCK_OFFSET_TO_BYTE3];
            UCHAR LargeStack;
        };

#if defined(_AMD64_)

        struct {
            UCHAR WaitBlockFill4[KWAIT_BLOCK_OFFSET_TO_LONG0];
            ULONG ContextSwitches;
        };

        struct {
            UCHAR WaitBlockFill5[KWAIT_BLOCK_OFFSET_TO_LONG1];
            volatile UCHAR State;
            UCHAR NpxState;
            KIRQL WaitIrql;
            KPROCESSOR_MODE WaitMode;
        };

        struct {
            UCHAR WaitBlockFill6[KWAIT_BLOCK_OFFSET_TO_LONG2];
            ULONG WaitTime;
        };

        struct {
            UCHAR WaitBlockFill7[KWAIT_BLOCK_OFFSET_TO_LONG3];
             union {
                 struct {
                     SHORT KernelApcDisable;
                     SHORT SpecialApcDisable;
                 };
         
                 ULONG CombinedApcDisable;
             };
        };

#endif

    };

    LIST_ENTRY QueueListEntry;

    //
    // The following fields are accessed during system service dispatch.
    //

    PKTRAP_FRAME TrapFrame;
    PVOID CallbackStack;
    PVOID ServiceTable;

#if defined(_AMD64_)

    ULONG KernelLimit;

#endif

    //
    // The following fields are referenced during ready thread and wait
    // completion.
    //

    UCHAR ApcStateIndex;
    UCHAR IdealProcessor;
    BOOLEAN Preempted;
    BOOLEAN ProcessReadyQueue;

#if defined(_AMD64_)

    PVOID Win32kTable;
    ULONG Win32kLimit;

#endif

    BOOLEAN KernelStackResident;
    SCHAR BasePriority;
    SCHAR PriorityDecrement;
    CHAR Saturation;
    KAFFINITY UserAffinity;
    PKPROCESS Process;
    KAFFINITY Affinity;

    //
    // The below fields are infrequently referenced.
    //

    PKAPC_STATE ApcStatePointer[2];
    union {
        KAPC_STATE SavedApcState;
        struct {
            UCHAR SavedApcStateFill[KAPC_STATE_ACTUAL_LENGTH];
            CCHAR FreezeCount;
            CCHAR SuspendCount;
            UCHAR UserIdealProcessor;
            UCHAR CalloutActive;

#if defined(_AMD64_)

            BOOLEAN CodePatchInProgress;

#elif defined(_X86_)

            UCHAR Iopl;

#else

            UCHAR OtherPlatformFill;

#endif

        };
    };

   [COLOR="Red"] PVOID Win32Thread;[/COLOR]
    PVOID StackBase;
    union {
        KAPC SuspendApc;
        struct {
            UCHAR SuspendApcFill0[KAPC_OFFSET_TO_SPARE_BYTE0];
            SCHAR Quantum;
        };

        struct {
            UCHAR SuspendApcFill1[KAPC_OFFSET_TO_SPARE_BYTE1];
            UCHAR QuantumReset;
        };

        struct {
            UCHAR SuspendApcFill2[KAPC_OFFSET_TO_SPARE_LONG];
            ULONG KernelTime;
        };

        struct {
            UCHAR SuspendApcFill3[KAPC_OFFSET_TO_SYSTEMARGUMENT1];
            PVOID TlsArray;
        };

        struct {
            UCHAR SuspendApcFill4[KAPC_OFFSET_TO_SYSTEMARGUMENT2];
            PVOID BBTData;
        };

        struct {
            UCHAR SuspendApcFill5[KAPC_ACTUAL_LENGTH];
            UCHAR PowerState;
            ULONG UserTime;
        };
    };

    union {
        KSEMAPHORE SuspendSemaphore;
        struct {
            UCHAR SuspendSemaphorefill[KSEMAPHORE_ACTUAL_LENGTH];
            ULONG SListFaultCount;
        };
    };

    LIST_ENTRY ThreadListEntry;
    PVOID SListFaultAddress;

#if defined(_WIN64)

    LONG64 ReadOperationCount;
    LONG64 WriteOperationCount;
    LONG64 OtherOperationCount;
    LONG64 ReadTransferCount;
    LONG64 WriteTransferCount;
    LONG64 OtherTransferCount;

#endif

} KTHREAD, *PKTHREAD, *PRKTHREAD;

#if !defined(_X86AMD64_) && defined(_AMD64_)

C_ASSERT((FIELD_OFFSET(KTHREAD, ServiceTable) + 16) == FIELD_OFFSET(KTHREAD, Win32kTable));
C_ASSERT((FIELD_OFFSET(KTHREAD, ServiceTable) + 8) == FIELD_OFFSET(KTHREAD, KernelLimit));
C_ASSERT((FIELD_OFFSET(KTHREAD, Win32kTable) + 8) == FIELD_OFFSET(KTHREAD, Win32kLimit));

#endif


//
// ccNUMA supported in multiprocessor PAE and WIN64 systems only.
//

#if (defined(_WIN64) || defined(_X86PAE_)) && !defined(NT_UP)

#define KE_MULTINODE

#endif