Update README with notes regarding non-void return callback API #48
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seungsoo47
approved these changes
Nov 11, 2025
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If the return type is non-void, the callback is created only as a blocking API.
The blocking API internally calls
Dart_PostCObject_DL()and performs thread blocking. Because thread is blocked,Dart_PostCObject_DL()cannot be receiving message, so leading to a deadlock.Therefore, callback APIs with non-void return types must be called from a separate Isolate.
Since there is no guidance on this, I am adding the relevant information.