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Resolved Features not supported by Multithreading

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  1. Roland Smith
    Roland Smith
  2. PowerServer
  3. Wednesday, 6 March 2024 21:25 PM UTC

I am pretty sure I saw somewhere in the documentation a list of features that we shouldn't use in background threads. Now I can't find it.

I have a multi-threaded C++ app that calls PB code using PBNI. For some reason if it is processing more than one thread at a time, the ExportJSON datastore method causes the program to abort. If it is only processing one thread, it works as expected.

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Tracy Huang @Appeon
Tracy Huang @Appeon Accepted Answer Pending Moderation
  1. Tuesday, 12 March 2024 08:52 AM UTC
  2. PowerServer
  3. # 1

Hi Roland,

Are you talking about the note on this page: https://docs.appeon.com/pb2022r3/objects_and_controls/CoderObject_object.html?

Generally speaking, PB features (added after 12.6) do not support multi-threading.

Regards

Tracy

 

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Miguel Leeuwe
  1. Miguel Leeuwe
  2. Thursday, 14 March 2024 10:48 AM UTC
Any alternative to multi threading you'd recommend?
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Tracy Huang @Appeon
  1. Tracy Huang @Appeon
  2. Friday, 15 March 2024 07:44 AM UTC
Hi Miguel,

The team needs more time and feedback before they can decide what to do or say in the product and documentation.

Regarding alternatives, for HTTPClient, you may consider implementing multi-thread in .NET and then call .NET DLLs in PB.



Regards, Tracy
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Miguel Leeuwe
  1. Miguel Leeuwe
  2. Friday, 15 March 2024 09:40 AM UTC
Thank you Tracy. That's what I was thinking of. We're going to be programming more and more in .Net.
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René Ullrich
René Ullrich Accepted Answer Pending Moderation
  1. Thursday, 7 March 2024 07:57 AM UTC
  2. PowerServer
  3. # 2

Hi Roland,

Yes, there are some features that are not threadsafe. But I don't know a documentation about this. Would be nice to have one.

I found out this features are not threadsafe:

- Metaclass

- HTTPClient (I think this was fixed with 2022 R3)

 

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Arnd Schmidt
  1. Arnd Schmidt
  2. Thursday, 7 March 2024 09:26 AM UTC
https://www.appeon.com/standardsupport/search/view?id=10871
  1. Helpful 2
mike S
  1. mike S
  2. Tuesday, 12 March 2024 13:03 PM UTC
The help still lists HTTPClient as not threadsafe. I assume the help was not updated.
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