Hello! I am trying to implement multithreading in my own extension to 3DSlicer, here is the approximate scheme: from Logic.run() ThreadA is started from ThreadA.run ThreadB is started in ThreadB.run there is infinite loop. I need to add the time.sleep in ThreadB.run function but when I do it the …

There are timers available in several libraries that are bundled with Slicer (Qt, VTK, etc.), but I usually prefer Qt timers, as they have are robust and have very simple API. See a timer example in the script repository or check out Qt documentation.

In general, in Slicer I would recommend doing parallel processing by running a CLI module . Slicer executes CLI modules in the background, taking care of synchronization, safely passing inputs and outputs, etc. For background tasks you can use timers. This may or may not be ideal for your use case. …

I will read about CLI but it seems more complicated than my implementation through python threads. About my case: I have several tasks on the server and want to check their status though slicer application and upload the results of them to the slicer environment when they are done, that’s why I need…

Since the background tasks do not perform computationally intensive operations in the Slicer process, there is no need to use threads for this but you can use timers instead. The advantage of timers is that your code runs in the main thread, so you can access all data in the scene, without the need …

what do you mean by the word timer? does slicer environment provide special timers? could you please explain how can I run a background process in slicer environment not using threads? I am reading about running commands from cli modules but don’t understand how I can implement my own cli module th…

Is it important to run it definitely through the main process and does scriptable module have several processes in it? I wonder because I tried to run my background thread using qt.Timer through class Logic.run or onApplyButton functions and GUI is frozen every time the thread makes computations and…

It seems that it was because I have another timeout (time.sleep) in my thread and that’s why gui was frozen. So qt.timer solved my problem, thanks for your help!

Multithreading in extension

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lassoan (Andras Lasso) May 30, 2019, 7:43pm 9

For future reference, if you must run time-consuming operation in the Slicer process then you can run it as a CLI module, which can be implemented in Python.

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Multithreading in extension

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