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We are converting multiple PDF documents to PNG images using multiple threads.
All our methods are thread-safe: no PDF document is processed by more than one thread at the same time, no Apsose objects are shared by multiple threads:

// Load the input PDF document
using (Aspose.Pdf.Document pdfDocument = new Aspose.Pdf.Document(filePath))

// Render the page into a raster image
using (MemoryStream imageStream = new MemoryStream())
// Create Resolution object
Resolution res = new Resolution(resolution);
if (format == ImageSaveFormat.PNG)
// Create PNG device with specified attributes
PngDevice pngDevice = new PngDevice(res);
// Convert a particular page and save the image to stream
pngDevice.Process(pdfDocument.Pages[pageNo], imageStream);
JpegDevice jpegDevice = new JpegDevice(res);
jpegDevice.Process(pdfDocument.Pages[pageNo], imageStream);

imageBytes = imageStream.ToArray();
//Logger.Instance.WriteLine(LoggingLevel.Information, "Exctracted page #" + pageNo);

Everything works fine except of some rare cases when *random* deadlocks in pngDevice.Process occur. See screenshot for more info - they always happen in the same method. On screenshot you see 10 "Running" processes - all of them are in "deadlock" state.

Hi Shai,

Thanks for using our API’s.

Can you please share some sample application which can help us in replicating this issue in our environment. We are sorry for your inconvenience.

Duplicate to http://www.aspose.com/community/forums/652976/multithreading-issue-pngdevice/showthread.aspx#652976

please close

Hi Shai,

Thanks for your feedback. Sure, we will keep you updated about the issue progress in subjected thread.

Best Regards,