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can't exit the event loop on Windows if winit never receives a WM_PAINT message #2698

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lunixbochs opened this issue Feb 25, 2023 · 0 comments
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can't exit the event loop on Windows if winit never receives a WM_PAINT message #2698

lunixbochs opened this issue Feb 25, 2023 · 0 comments
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@lunixbochs
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I can trigger this in headless CI running under a gitlab-runner as a service. It doesn't happen to me interactively.

The state machine is stuck in HandlingMainEvents - it never receives WM_PAINT, so never enters HandlingRedrawEvents, so never enters Idle, so runner.handling_events() remains true here and we never exit:

https://github.com/rust-windowing/winit/blob/37c0f61/src/platform_impl/windows/event_loop.rs#L290-L294
@lunixbochs lunixbochs changed the title winit can't exit the event loop on Windows if never receives a WM_PAINT message can't exit the event loop on Windows if winit never receives a WM_PAINT message Feb 25, 2023
@fredizzimo fredizzimo mentioned this issue Apr 30, 2023
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@lunixbochs @madsmtm