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Private Sub Class_Initialize() Set m_Workers = New Collection End Sub Friend Sub StartNewWorker(Data As Variant) Dim WD As WorkerData Dim CacheWD As Currency Dim strKey As String 'Create the worker Set WDWorkerObject = CreateObject("MyAppWorker") 'Launch the task and retrieve its notify pointer WDNotifyPointer = WDWorkerObjectDoStuff(Me, Data) 'Transfer ownership of WD to the Currency 'and place it in the collection strKey = CStr(ObjPtr(WDWorkerObject)) CopyMemory CacheWD, WD, LenB(CacheWD) ZeroMemory WD, LenB(CacheWD) m_WorkersAdd CacheWD, strKey End Sub Public Sub WorkerDone( _ ByVal Worker As Worker, Data As Variant) Dim WD As WorkerData Dim CacheWD As Currency Dim strKey As String 'Do something with Data strKey = CStr(ObjPtr(Worker)) 'If worker has been signalled, then 'it is already out of the collection, 'so we have to error trap this On Error Resume Next CacheWD = m_Workers(strKey) On Error GoTo 0 If CacheWD Then CopyMemory WD, CacheWD, LenB(CacheWD) CacheWDRemove strKey End If End Sub Friend Sub SignalWorkers()
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Dim WD As WorkerData Dim CacheWD As Currency Dim Iter As Variant For Each Iter In m_Workers CacheWD = Iter CopyMemory WD, CacheWD, LenB(CacheWD) InterlockedIncrement WDNotifyPointer Set WDWorkerObject = Nothing Next Set m_Workers = New Collection End Sub
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'Worker class Implements FireTimer Private m_Notify As Long Private m_TimerID As Long Private m_Data As Variant Private m_Controller As Controller Private Function HaveBeenNotified() As Boolean HaveBeenNotified = m_Notify End Function Public Function DoStuff( _ ByVal Controller As Controller, _ Data As Variant) As Long m_Data = Data Set m_Controller = Controller m_TimerID = AddTimer(Me) DoStuff = VarPtr(m_Notify) End Sub Private Sub FireTimer_Go() Dim Data As Variant m_TimerID = 0 'Process Data 'Do If HaveBeenNotified Then 'Just quit, or call WorkerDone End If 'Loop 'WorkerDone required for teardown m_ControllerWorkerDone Me, Data End Sub
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Private Sub Class_Terminate() If m_TimerID Then ClearTimer m_TimerID End If End Sub You should note that the teardown order is quite lax in this example If SignalWorkers is called and the Controller object is released by the controlling thread, a worker releases the last reference to the Controller object There may be code running in the worker thread after the Controller has been released But, if all worker threads have called WorkerDone before SignalWorkers is called, the last code in the process most likely runs on the controlling thread, not on the worker In an ActiveX EXE, there is no danger in tearing down threads in a random order because each apartment can run on its own VB coordinates teardown for you You'll see later that being this lax about teardown order is fatal when you create worker threads in DLLs
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Bidirectional Cross-Thread Direct Memory Access Following Rule one described above, in order to let the controlling thread signal a worker thread the controlling thread must hold a reference to the worker object that owns the signaled memory location If you also want the worker to modify memory owned by the controlling thread, you have to use similar precautions Let's design a worker thread that gives a continuous progress report to the controlling thread and can still be cancelled or terminated by the controller In this scenario, the main difference is that the Worker holds a pointer into memory that is provided by the controlling thread To provide this memory, the controller creates a private object (let's call it ThreadData) for every worker thread, and the worker holds a pointer to an address in the ThreadData class 'ThreadData class Private m_NotifyProgress As Long Private m_CancelPtr As Long Private m_Worker As Worker Friend Sub CreateWorker( Parent As Controller, _ Data As Variant, _ THREADS IN VB
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Workers As Collection) Set m_Worker = CreateObject("MyAppWorker") m_CancelPtr = m_WorkerDoStuff( _ Parent, Data, VarPtr(m_NotifyProgress)) WorkersAdd Me, CStr(ObjPtr(m_Worker)) End Sub Friend Sub CancelWorker() 'Signal if we haven't signalled before If m_CancelPtr Then InterlockedIncrement m_CancelPtr m_CancelPtr = 0 End If End Sub Friend Property Get Progress() As Single 'Return a percentage Progress = m_NotifyProgress , 100 End Function 'Controlling class Private m_Workers As Collection Friend Sub StartNewWorker(Data As Variant) Dim ThreadData As New ThreadData ThreadDataCreateWorker(Me, Data, m_Workers) End Sub Public Sub WorkerDone( _ ByVal Worker As Worker, Data As Variant) 'Do something with Data 'Remove the ThreadData object from the collection 'Unlike the first example, we know it is 'there because signaling does not remove the 'item from the collection m_WorkersRemove CStr(ObjPtr(Worker)) End Sub Friend Sub SignalWorkers() Dim TD As ThreadData For Each TD In m_Workers TDCancelWorker Next End Sub
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