Dispatch awaits indefinitely on other desktop environments

[jfroy]

cosmic-randr list hangs on Arch with plasma 6 rc1. It seems to be because the context.dispatch().await does not return in async fn list.

    async fn list(&mut self, kdl: bool) -> Result<(), Box<dyn std::error::Error>> {
        let _res = self.context.dispatch(&mut self.event_queue).await;

In async fn main, event_queue.roundtrip consistently returned 54 on my system when I tested.

rustc 1.72.0 (5680fa18f 2023-08-23)

[richardmrodriguez]

I have noticed that cosmic-randr list also hangs when running on Pop! on Wayland (the GNOME shell Wayland session, not the COSMIC session).

[martyfuhry]

It hangs in COSMIC on Wayland, as well.

[wash2]

I believe it hangs at https://github.com/pop-os/cosmic-randr/blob/8d0938029f223016fde11aef4c5233ddbfdb2796/lib/src/lib.rs#L64C34-L64C50 or

cosmic-randr/lib/src/lib.rs

Line 102 in 8d09380

event_queue.dispatch_pending(data)

when calling dispatch_pending. It could be a bug in wayland_client, or maybe a small usage mistake in cosmic-randr, but I'm not sure yet.

[wash2]

Ahh it's actually the tachyonix channel that seems to fill up and then a callback blocks on the send while dispatching. Increasing the channel size should fix the issue, or using an unbounded channel.