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4404 :: Memory regions / gc:regions

• DeletedUser (orginal) [2018-11-23T21:49:24+01:00] view original

  Does ANYONE know how to use memory regions beyond the examples that are available on the forum? These examples tend to consist of -

  
  var rx: MemRegion
  
  withRegion rx:
    discard 0
  Run

  While this example code proves regions work - it doesn't prove much beyond that. There is no - if any - mention of them in the docs.

  The module itself claims - # Stacks can also be moved from one thread to another. - but there are not tests I can find involving regions or threads. https://github.com/nim-lang/Nim/blob/devel/lib/system/gc_regions.nim#L33

  Does anyone besides Araq know how to use these regions successfully? If so - could some of that knowledge be disseminated so that I, or someone else, could work on documentation for this feature?

  If no one knows how to use them properly - and we don't plan on documenting any time soon - is there any real reason to have them or include them?

  I have a lot of difficulty finding any real use of them on github...

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• Araq (orginal) [2018-11-24T10:07:02+01:00] view original

  Well this feature is underdeveloped and so the code contains lies/stuff not implemented. However, Channel works and can be used to move a region to a different thread. Alternatively you can have a region in a global, shared variable and access it with a Lock.

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• DeletedUser (orginal) [2018-11-24T11:33:03+01:00] view original

  Gotcha - thanks for the explanation. I will play around with them today.

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• bratsteve (orginal) [2018-11-29T23:43:30+01:00] view original

  The features where it developed in such a way where the user will liable to manage it in such a way where it will be going to contain code that implemented https://lenovosupport.net/blog/fix-lenovo-laptop-screen-flickering/ will provide the different thread .

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• bpr (orginal) [2018-12-01T01:16:03+01:00] view original

  Well this feature is underdeveloped and so the code contains lies/stuff not implemented.

  I see that the feature is not in the Nim manual any more. The manual always was aspirational, describing unimplemented features, but now I wonder, are regions no longer desired? Will destructors handle all cases where regions may have been used?

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