关于THREADINFO结构

线程为窗口维护一个threadinfo结构， 
threadinfo数据结构： 
------------------ 
|登记消息队列指针| 
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|虚拟输入队列指针| 
------------------ 
|发送消息队列指针| 
------------------ 
|应答消息队列指针| 
------------------ 
| nExitCode | 
------------------ 
| 唤醒标志 | 
------------------ 
|局部输入状态变量| 
------------------

具体表现为每个线程有一个：gptiCurrent的全局变量。

threadinfo结构体是：

typedef struct tagTHREADINFO {
    W32THREAD;

//***************************************** begin: USER specific fields

    LIST_ENTRY      PtiLink;            // Link to other threads on desktop
    PTL             ptl;                // Listhead for thread lock list
    PTL             ptlOb;              // Listhead for kernel object thread lock list
    PTL             ptlPool;            // Listhead for temp pool usage
    int             cEnterCount;

    struct tagPROCESSINFO *ppi;         // process info struct for this thread

    struct tagQ    *pq;                 // keyboard and mouse input queue

    PKL             spklActive;         // active keyboard layout for this thread
    MLIST           mlPost;             // posted message list.
    USHORT          fsChangeBitsRemoved;// Bits removed during PeekMessage
    USHORT          cDeskClient;        // Ref count for CSRSS desktop

    PCLIENTTHREADINFO pcti;             // Info that must be visible from client
    CLIENTTHREADINFO cti;              // Use this when no desktop is available

    HANDLE          hEventQueueClient;
    PKEVENT         pEventQueueServer;

    PKEVENT        *apEvent;            // Wait array for xxxPollAndWaitForSingleObject

    PDESKTOP        rpdesk;
    HDESK           hdesk;              // Desktop handle
    ACCESS_MASK     amdesk;             // Granted desktop access
    PDESKTOPINFO    pDeskInfo;          // Desktop info visible to client
    PCLIENTINFO     pClientInfo;        // Client info stored in TEB

    DWORD           TIF_flags;          // TIF_ flags go here.

    PUNICODE_STRING pstrAppName;        // Application module name.

    struct tagSMS *psmsSent;           // Most recent SMS this thread has sent
    struct tagSMS *psmsCurrent;        // Received SMS this thread is currently processing
    struct tagSMS *psmsReceiveList;    // SMSs to be processed

    LONG            timeLast;           // Time, position, and ID of last message
    POINT           ptLast;
    DWORD           idLast;

    int             cQuit;
    int             exitCode;

    int             cPaintsReady;
    UINT            cTimersReady;

    PMENUSTATE      pMenuState;

    union {
        PTDB            ptdb;           // Win16Task Schedule data for WOW thread
        PWINDOWSTATION pwinsta;        // Window station for SYSTEM thread
        PDESKTOP        pdeskClient;    // Desktop for CSRSS thread
    };

    PSVR_INSTANCE_INFO psiiList;        // thread DDEML instance list
    DWORD           dwExpWinVer;
    DWORD           dwCompatFlags;      // The Win 3.1 Compat flags

    UINT            cWindows;           // Number of windows owned by this thread
    UINT            cVisWindows;        // Number of visible windows on this thread

    struct tagQ    *pqAttach;           // calculation variabled used in
                                        // AttachThreadInput()

    int             iCursorLevel;       // keep track of each thread's level
    DWORD           fsReserveKeys;      // Keys that must be sent to the active
                                        // active console window.
    struct tagTHREADINFO *ptiSibling;   // pointer to sibling thread info

    PMOVESIZEDATA   pmsd;

    DWORD           fsHooks;                // WHF_ Flags for which hooks are installed
    PHOOK           asphkStart[CWINHOOKS]; // Hooks registered for this thread
    PHOOK           sphkCurrent;            // Hook this thread is currently processing

    PSBTRACK        pSBTrack;

#ifdef FE_IME
    PWND            spwndDefaultIme;    // Default IME Window for this thread
    PIMC            spDefaultImc;       // Default input context for this thread
    HKL             hklPrev;            // Previous active keyboard layout
#endif
} THREADINFO;

__int16 __stdcall RegisterClassExWOWW(PWNDCLASSEXW lpWndClass, int pdwWOWstuff, PROC lpfnWorker, int fnid)
{
PWNDCLASSEXW lpWndClass_; // ebx@1
HINSTANCE v5; // eax@6
UINT v6; // eax@7
bool State; // esi@14
LPCWSTR v8; // eax@15
int v9; // ecx@16
HINSTANCE hInstance; // ebx@19
HMODULE v11; // eax@20
void *v13; // eax@14
int Flags2; // eax@47
int v15; // [sp+27Ch] [bp-4h]@1
LPDWORD pdwWOWstuff_; // [sp+48h] [bp-238h]@1
int v17; // [sp+58h] [bp-228h]@1
int v18; // [sp+68h] [bp-218h]@1
int v19; // [sp+44h] [bp-23Ch]@1
signed int MinorSubsystemVersion; // [sp+78h] [bp-208h]@7
HLOCAL fnWorker; // [sp+6Ch] [bp-214h]@9
char v22; // [sp+38h] [bp-248h]@9
WNDCLASSEX WndClass; // [sp+8h] [bp-278h]@10
int v24; // [sp+7Ch] [bp-204h]@14
__int16 v25; // [sp+4Ch] [bp-234h]@15
CHAR *pstrClassName; // [sp+54h] [bp-22Ch]@15
__int16 v27; // [sp+5Ch] [bp-224h]@17
int pcmn; // [sp+64h] [bp-21Ch]@17
void *v29; // [sp+70h] [bp-210h]@26
__int16 v30; // [sp+4Eh] [bp-232h]@35
LPCWSTR v31; // [sp+50h] [bp-230h]@35
__int16 v32; // [sp+5Eh] [bp-222h]@36
signed int v33; // [sp+60h] [bp-220h]@36

lpWndClass_ = lpWndClass;
v15 = _security_cookie_77D701B8;
pdwWOWstuff_ = (LPDWORD)pdwWOWstuff;
v17 = 0;
v18 = 0;
v19 = 0;
if ( (_WORD)lpfnWorker )
{
    if ( (_WORD)lpfnWorker == 8192 )
      lpfnWorker = 0;
    MinorSubsystemVersion = 1024;
}
else
{
    if ( lpWndClass->cbClsExtra < 0
      || lpWndClass->cbWndExtra < 0
      || lpWndClass->hInstance == hInstance && *(_DWORD *)(*MK_FP(__FS__, 24) + 1748) >= 0x400u )
      goto LABEL_32;
    if ( !lpWndClass->hInstance )
      lpWndClass->hInstance = GetModuleHandleW(0);
    v5 = lpWndClass_->hInstance;
    if ( !v5 )
      v5 = GetModuleHandleW(0);
    MinorSubsystemVersion = pfnGetExpWinVer_77D70268(v5);
    v6 = lpWndClass_->style;
    if ( v6 & 0xF7FC0114 )
    {
      if ( (unsigned int)MinorSubsystemVersion > 0x30A )
        goto LABEL_32;
      lpWndClass_->style = v6 & 0x803FEEB;
    }
    if ( lpWndClass_->hbrBackground > (HBRUSH)0x1F && !GdiValidateHandle(lpWndClass_->hbrBackground) )
    {
      if ( (unsigned int)MinorSubsystemVersion <= 0x300 )
      {
        lpWndClass_->hbrBackground = 0;
        goto LABEL_9;
      }
LABEL_32:
      UserSetLastError_77D1EBE3(87);
      return 0;
    }
}
LABEL_9:
if ( InitClsMenuNameW_77D1A344(&fnWorker, lpWndClass_->lpszMenuName, &v22) )
{
    memcpy(&WndClass, lpWndClass_, sizeof(WndClass));
    if ( (unsigned int)MinorSubsystemVersion > 0x30A )
      LOBYTE(fnid) = (_BYTE)fnid | 0x80;
    if ( *(_BYTE *)(*MK_FP(__FS__, 24) + 1760) & 2 )
    {
      Flags2 = GetAppCompatFlags2(0xFFFF9900u);
      if ( !(Flags2 & 0x800000) )
        BYTE3(fnid) &= 0xBFu;
    }
    if ( BYTE1(fnid) & 1 )
    {
      LOWORD(State) = 0;
      v13 = ClassNameToVersion_77D198A0((wchar_t *)lpWndClass_->lpszClassName, (int)&v24, 0, 0);
      MinorSubsystemVersion = (signed int)v13;
      if ( !v13 )
      {
LABEL_25:
        if ( (unsigned int)fnWorker & 0xFFFF0000 )
          LocalFree(fnWorker);
        if ( (unsigned int)v29 & 0xFFFF0000 )
          LocalFree(v29);
        return State;
      }
    }
    else
    {
      MinorSubsystemVersion = (signed int)lpWndClass_->lpszClassName;
    }
    v17 = 0;
    pstrClassName = (CHAR *)&v25;
    v8 = lpWndClass_->lpszClassName;
    if ( (unsigned int)v8 & 0xFFFF0000 )
    {
      RtlInitUnicodeString(&v25, lpWndClass_->lpszClassName);
      v9 = 0;
    }
    else
    {
      v9 = 0;
      v30 = 0;
      v25 = 0;
      v31 = v8;
    }
    pcmn = (int)&v27;
    v18 = v9;
    if ( MinorSubsystemVersion & 0xFFFF0000 )
    {
      RtlInitUnicodeString(&v27, MinorSubsystemVersion);
    }
    else
    {
      v32 = v9;
      v27 = v9;
      v33 = MinorSubsystemVersion;
    }
    hInstance = lpWndClass_->hInstance;
    State = (unsigned __int16)NtUserRegisterClassExWOW_77D19A29(
                                &WndClass,
                                (PUNICODE_STRING)pstrClassName,
                                (PVOID)pcmn,
                                (int (__stdcall *)())&fnWorker,
                                (WORD)lpfnWorker,
                                fnid,
                                pdwWOWstuff_);
    if ( hInstance )
      v11 = hInstance;
    else
      v11 = GetModuleHandleW(0);
    if ( (unsigned int)pfnGetExpWinVer_77D70268(v11) < 0x30A )
      State = State != 0;
    if ( State )
      return State;
    goto LABEL_25;
}
return 0;
}