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ObjC interop guide needs to mention callbacks and threading limitations #4191

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liamappelbe opened this issue Aug 25, 2022 · 0 comments · Fixed by #4194
Closed

ObjC interop guide needs to mention callbacks and threading limitations #4191

liamappelbe opened this issue Aug 25, 2022 · 0 comments · Fixed by #4194
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@liamappelbe
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a.tut.tutorial Relates to the Tutorial section of dart.dev dev.ffi Relates to foreign function interface to integrate native code with Dart e1-hours Can complete in < 8 hours of normal, not dedicated, work p2-medium Necessary but not urgent concern. Resolve when possible.

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Page URL

https://dart.dev/guides/libraries/objective-c-interop

Page source

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Describe the problem

There are 3 callback/threading issues with the current Objective-C interop:

  1. Dart can't pin an isolate to a thread at the moment (Feature request: API to allow setting thread pinning for Isolates sdk#46943)
  2. Most of the Apple APIs don't guarantee which thread a callback will be run on
  3. Many Apple APIs (eg any interacting with UI) can only be called from the main thread

Users need to keep these in mind when writing interop code that deals with callbacks, async APIs, or UI APIs.

Expected fix

Mention these limitations in the documentation.

Additional context

No response
@liamappelbe liamappelbe self-assigned this Aug 25, 2022
@parlough parlough added p2-medium Necessary but not urgent concern. Resolve when possible. a.tut.tutorial Relates to the Tutorial section of dart.dev e1-hours Can complete in < 8 hours of normal, not dedicated, work dev.ffi Relates to foreign function interface to integrate native code with Dart labels Aug 25, 2022
@liamappelbe liamappelbe mentioned this issue Aug 25, 2022
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parlough added a commit that referenced this issue Aug 30, 2022
@liamappelbe @sfshaza2 @parlough
Mention callbacks and threading in Objective C guide (#4194)
0064ef9 
Fixes #4191

Co-authored-by: Shams Zakhour (ignore Sfshaza) <44418985+sfshaza2@users.noreply.github.com>
Co-authored-by: Parker Lougheed <parlough@gmail.com>
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@liamappelbe liamappelbe

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a.tut.tutorial Relates to the Tutorial section of dart.dev dev.ffi Relates to foreign function interface to integrate native code with Dart e1-hours Can complete in < 8 hours of normal, not dedicated, work p2-medium Necessary but not urgent concern. Resolve when possible.
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Mention callbacks and threading in Objective C guide liamappelbe/site-www
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@liamappelbe @parlough