PDF XChange Forum

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//pseudo

for each pdf do
{
1. IPXV_Inst::AsyncDo to run an IOperation (with pdf as input parameter) in background thread
2. During the execution of IOperation.Do periodically call IPXV_Inst::ThreadSafeCall 
3. In OnThreadSafeCall check main thread for "my stop flag" - if set exit the Do method (this will fire IPXV_AsyncDoCallback.OnFinishOp)
4. Check for stop flag in IPXV_AsyncDoCallback.OnStartOp to check if "this" operation in thread pool should even start executing.
}

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// create one 'global' IFlag-object:
auxInst.CreateFlag(&myCancelFlag);

// create and start all tasks and share with them this one myCancelFlag
for (pdf : listOfPdfs)
{
       MyOperation op = new MyOperation(pdf, myCancelFlag);
       pdfInst.AsyncDo(op, ..);
}

// inside the operation
MyOperation::Do()
{
       // do some work with m_Pdf
       if (m_CancelFlag.Value)
       {
              return; // cancel the task
       }
       // do some work with m_Pdf
}

// then in the main thread, in UI, to stop all work

OnBtnCancel()
{
     myCancelFlag.Value = true;
     //
     // here, if you need, you may wait for all corresponding IPXV_AsyncDoCallback.OnFinishOp calls. 
     // Of course, while you wait, to keep the UI alive - you need also 'pump' all window's events..
}

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maxThreadsNum = Prefs.MaxNumOfWorkingThreads;
if (maxThreadsNum <= 0) // automatic
    maxThreadsNum = CpuCoresNum;
else
    maxThreadsNum = min(maxThreadsNum, CpuCoresNum);
maxThreadsForAsyncDo = min(maxThreadsNum, 3); // 3 - it can be increased in the future
maxThreadsForAsyncDo = max(maxThreadsForAsyncDo, 2);

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pdfCtl.Inst.Settings["Performance.MaxThreads"].v = 16;
pdfCtl.Inst.Settings["Performance.MaxBackgroundThreads"].v = 8;
pdfCtl.Inst.FireAppPrefsChanged(PDFXEdit.PXV_AppPrefsChanges.PXV_AppPrefsChange_Performance);