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Set m_Data = Data Else m_Data = Data End If End Sub Friend Sub GetData(Data As Variant) 'This is called only once Always steal 'Before stealing, make sure there's 'nothing lurking in Data Data = Empty CopyMemory ByVal VarPtr(Data), ByVal VarPtr(m_Data), 16 CopyMemory ByVal VarPtr(m_Data), 0, 2 End Sub Private Sub Class_Terminate() 'This shouldn't happen, but just in case If m_ThreadHandle Then CloseHandle m_ThreadHandle End Sub
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Workers Without Cross-Thread Object Support The first architecture works well regardless of whether you call marshaled objects from the worker thread However, many parts of the architecture are overkill if you never pass an object The second architecture uses shared memory to not only signal from one thread to the other, but also to pass input and output data between threads Sharing memory in this fashion may sound risky, but is actually completely safe if you are careful never to write to the same block of memory from both threads at the same time and only read data that you know the other thread has finished writing There is no STA restriction on sharing data with other threads in the same process, just with calling methods on STA objects from a nonnative thread When you scratch object support from the list of requirements, you also scratch the need to marshal the InputData from the main object to the worker Marshaling the input data with the InputData parameter was the only reason that RegisterNewThread was a Public method, which in turn was the only reason that ThreadControl was a PublicNotCreatable class With RegisterThread gone, there is no need to explicitly marshal and unmarshal the ThreadControl object, so you can also eliminate the CoVeryLongAPIName functions from an
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object-free architecture Since there is no danger of a worker calling the main thread during teardown for either RegisterNewThread or another custom method, there is also no need to spin the OLE window during StopWorkerThreads In addition to removing all of the object support calls, the second architecture also removes the event synchronization object from the controlling thread This event object immediately returned an error result during thread creation, but it had the nasty side effect of blocking the controlling thread Without the Event object, you get no immediate feedback if you pass an invalid CLSID or cause another immediate problem However, you can get error information a number only with the GetWorkerOutput function added to the ThreadControl object for the second architecture The Event object ensured that the ThreadProcData structure on the CreateWorkerThread function's stack stayed on the stack until the worker thread had gleaned all the necessary information If you don't use the Event to block the controlling thread in CreateWorkerThread, the only other choice is to allocate the data in a memory block that lives longer than the stack To simplify matters by using a single heap allocation, all the data required for the controlling and worker threads has been moved into ThreadData, which is now a structure instead of a class Cross-thread interactions for this new system are shown in Figure 134 The memory for each ThreadData structure is allocated directly with CoTaskMemAlloc The role of each field in the structure is shown in the following code snippet 'Key for ThreadData comments ' WT:R = Read by worker thread ' CT:W = Written by controlling thread ' CT:RW = Written and read by controlling thread ' WT:RW = Written and read by controlling thread Public Type ThreadData CLSID As CLSID 'CLSID to create {CT:W, WT:R) hr As Long 'An error code (WT:W, CT:R) pCritSect As Long 'Critical-section pointer ' (CT:W, WT:R) ThreadDone As Long 'Increment on completion ' (WT:W, CT:R) InputData As Variant 'Input for the worker(CT:W, WT:R)
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