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TL As ThreadLaunch TC As ThreadControl ThreadDataCookie As Long IID_IUnknown As VBGUID pMarshalStream As Long ThreadDonePointer As Long pCritSect As Long 'Extreme care must be taken in this function to 'not execute normal VB code until an object has been 'created on this thread by VB hr = CoInitialize(0) With ThreadProcData ThreadDonePointer = ThreadDonePointer If hr And FailBit Then hr = hr PulseEvent EventHandle Exit Function End If With IID_IUnknown Data4(0) = &HC0 Data4(7) = &H46 End With hr = CoCreateInstance(CLSID, Nothing, _ CLSCTX_INPROC_SERVER, IID_IUnknown, pUnk) If hr And FailBit Then hr = hr PulseEvent EventHandle CoUninitialize Exit Function End If 'If we made it this far, we can start using 'normal VB calls because we have an initialized 'object on this thread On Error Resume Next Set TL = pUnk Set pUnk = Nothing If Err Then hr = Err PulseEvent EventHandle CoUninitialize Exit Function THREADS IN VB
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End If ThreadDataCookie = ThreadDataCookie pMarshalStream = pMarshalStream pCritSect = pCritSect 'The controlling thread can continue at this point 'The event must be pulsed here because 'CoGetInterfaceAndReleaseStream blocks if 'WaitForSingleObject is still blocking the 'controlling thread PulseEvent EventHandle Set TC = CoGetInterfaceAndReleaseStream( _ pMarshalStream, IID_IUnknown) 'An error is not expected here If it happens, 'we have no way of passing it out because the 'structure may already be popped from the stack, 'meaning that we can't use ThreadProcDatahr If Err Then 'Note: Incrementing the ThreadDonePointer call 'needs to be protected by a critical section once 'the ThreadSignalPointer has been passed to 'ThreadControl Before that time, there is no 'conflict InterlockedIncrement ThreadDonePointer Set TL = Nothing CoUninitialize Exit Function End If 'Launch background processing and wait for it to 'finish Note: TC is released by ThreadControl 'RegisterNewThread ThreadStart = TLGo(TC, ThreadDataCookie) 'Tell the controlling thread that this thread is done EnterCriticalSection pCritSect InterlockedIncrement ThreadDonePointer LeaveCriticalSection pCritSect 'Release TL after the critical section This 'prevents ThreadDataSignalThread from 'signalling a pointer to released memory
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Set TL = Nothing End With CoUninitialize End Function
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'ThreadData class, ThreadDatacls Private m_ThreadDone As Long Private m_ThreadSignal As Long Private m_ThreadHandle As Long Private m_Data As Variant Private m_Controller As ThreadControl Friend Function ThreadCompleted() As Boolean Dim ExitCode As Long ThreadCompleted = m_ThreadDone If ThreadCompleted Then 'Since code runs on the worker thread after the 'ThreadDone pointer is incremented, there is a chance 'that we are signaled but the thread hasn't yet 'terminated In this case, just claim we aren't done 'yet to make sure that code on all worker threads is 'actually completed before ThreadControl terminates If m_ThreadHandle Then If GetExitCodeThread(m_ThreadHandle, ExitCode) Then If ExitCode = STILL_ACTIVE Then ThreadCompleted = False Exit Function End If End If CloseHandle m_ThreadHandle m_ThreadHandle = 0 End If End If End Function Friend Property Get ThreadDonePointer() As Long ThreadDonePointer = VarPtr(m_ThreadDone) End Property Friend Property Let ThreadSignalPointer(ByVal RHS As Long) m_ThreadSignal = RHS End Property Friend Property Let ThreadHandle(ByVal RHS As Long)
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'This takes over ownership of the ThreadHandle m_ThreadHandle = RHS End PropertyFriend Sub SignalThread( _ ByVal pCritSect As Long, ByRef fInCriticalSection As Boolean) 'm_ThreadDone and m_ThreadSignal must be checked/modified 'inside a critical-section because m_ThreadDone could 'change on some threads while we are signalling This 'causes m_ThreadSignal to point to invalid memory, as 'well as other problems The parameters to this function 'are provided to ensure that the critical section is 'entered only when necessary If fInCriticalSection is 'set, the caller must call LeaveCriticalSection on 'pCritSect This is left up to the caller because 'this function is designed to be called on multiple 'instances in a tight loop There is no point in 'repeatedly entering/leaving the critical section If m_ThreadSignal Then If Not fInCriticalSection Then EnterCriticalSection pCritSect fInCriticalSection = True End If If m_ThreadDone = 0 Then InterlockedIncrement m_ThreadSignal End If 'No point in signalling twice m_ThreadSignal = 0 End If End Sub Friend Property Set Controller(ByVal RHS As ThreadControl) Set m_Controller = RHS End Property Friend Sub SetData( _ Data As Variant, ByVal fStealData As Boolean) If IsEmpty(Data) Or IsMissing(Data) Then Exit Sub If fStealData Then CopyMemory ByVal VarPtr(m_Data), ByVal _ VarPtr(Data), 16
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