Bug 32982 - JSExport methods taking an argument block indefinitely when invoked from JavaScriptCore
Summary: JSExport methods taking an argument block indefinitely when invoked from Java...
Status: RESOLVED DUPLICATE of bug 32511
Alias: None
Product: Xamarin.Mac
Classification: Desktop
Component: Library (Xamarin.Mac.dll) ()
Version: Master
Hardware: PC Mac OS
: --- normal
Target Milestone: ---
Assignee: Rolf Bjarne Kvinge [MSFT]
Depends on:
Reported: 2015-08-11 18:32 UTC by Aaron Bockover [MSFT]
Modified: 2015-08-12 07:54 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

Test case exhibiting broken JSExport (346.83 KB, application/zip)
2015-08-11 18:32 UTC, Aaron Bockover [MSFT]

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Description Aaron Bockover [MSFT] 2015-08-11 18:32:52 UTC
Created attachment 12456 [details]
Test case exhibiting broken JSExport

When exporting a method via JSExport to JavaScriptCore that takes an argument (e.g. a JSValue would be most likely, but presumably primitives such as int, string, etc should work), something in the runtime is blocking (presumably on the conversion from the JSC object to the C# one) before the C# method on the JSExport interface is invoked.

Exporting methods to JSC that do not take any arguments works as expected.

Similar blocking behavior can be seen with the following, one of which is likely the underlying culprit for the JSExport invocation blocking:

- JSValue.From (NSObject, JSContext)
- JSValue.ToObject ()

Attached is a Xamarin.Mac sample that likely requires the latest Xamarin.Mac and Xamarin Studio from master (since it uses storyboards instead of xibs).

When running the sample, clicking the "Working" button should print the JS mouseEvent object to the console. Clicking "Broken" will block the application indefinitely (pinwheel of doom).
Comment 1 Rolf Bjarne Kvinge [MSFT] 2015-08-12 06:31:53 UTC

*** This bug has been marked as a duplicate of bug 32511 ***
Comment 2 Aaron Bockover [MSFT] 2015-08-12 07:54:12 UTC
To see the meat of the test case code without having to download the whole project: