Can't run in a thread?

[mrmachine]

When I try to run the example menu bar app in a thread, I get an endless stream of this

2014-10-28 05:50:37.168 python[13952:248458] *** Assertion failure in +[NSUndoManager _endTopLevelGroupings], /SourceCache/Foundation/Foundation-1151.16/Misc.subproj/NSUndoManager.m:340
2014-10-28 05:50:37.168 python[13952:248458] NSInternalInconsistencyException - +[NSUndoManager(NSInternal) _endTopLevelGroupings] is only safe to invoke on the main thread.
2014-10-28 05:50:37.169 python[13952:248458] *** Assertion failure in +[NSUndoManager _endTopLevelGroupings], /SourceCache/Foundation/Foundation-1151.16/Misc.subproj/NSUndoManager.m:340
2014-10-28 05:50:37.169 python[13952:248458] +[NSUndoManager(NSInternal) _endTopLevelGroupings] is only safe to invoke on the main thread.
2014-10-28 05:50:37.169 python[13952:248458] (
    0   CoreFoundation                      0x00007fff9b82764c __exceptionPreprocess + 172
    1   libobjc.A.dylib                     0x00007fff8d7bb6de objc_exception_throw + 43
    2   CoreFoundation                      0x00007fff9b82742a +[NSException raise:format:arguments:] + 106
    3   Foundation                          0x00007fff99ddd5b9 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195
    4   Foundation                          0x00007fff99d4efef +[NSUndoManager(NSPrivate) _endTopLevelGroupings] + 156
    5   AppKit                              0x00007fff8cc82015 -[NSApplication run] + 756
    6   _objc.so                            0x000000010c0c0907 ffi_call_unix64 + 79
    7   ???                                 0x000000010e0c25c0 0x0 + 4530644416
)

until I force quit. Here's the code:

class AppThread(Thread):
    def __init__(self, *args, **kwargs):
        super(AppThread, self).__init__(*args, **kwargs)
        self.start()

    def run(self):
        AwesomeStatusBarApp().run()

app_thread = AppThread()

Is this a limitation of pyobjc or a problem with rumps?

[n3r0-ch]

Have the same problem. Need a solution

[davad]

From the error, it sounds like the underlying library expects the application to be in the main thread.

If you have work that needs to happen asynchronously, you can always spawn processes from the main GUI process.

[melvyn2]

MacOS doesn't support GUI operations from non-main threads.