ChanServ changed the topic of #wayland to: https://wayland.freedesktop.org | Discussion about the Wayland protocol and its implementations, plus libinput
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<yrlf> Hi! I have a core wayland protocol question: is it guaranteed that singleton globals like xdg_output_manager appear before globals that can appear multiple times like wl_output?
<yrlf> or is the order of globals completely arbitrary
<yrlf> and the only thing that I can rely on is all singleton globals appearing after the first round trip
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<zamundaaa[m]> yrlf: it's arbitrary
<danieldg> with wl_output v5 you mostly don't need xdg-output anyway
<danieldg> but yeah, if you need to bind it, you have to handle both orders
<danieldg> (sorry, v4)
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<soreau> wl_output v4 has the output name finally?
<soreau> yrlf: the order of the globals depends on the order the compositor sends them
<soreau> but I don't think it's strictly guaranteed that all globals will be sent after a single roundtrip call; i.e. there's no 'done' event..
<soreau> sometimes I wonder if it's a good idea to write `while (!global) wl_display_roundtrip();`
<danieldg> soreau: globals are guaranteed to show up after one roundtrip
<danieldg> it's possible to add them later, but that's in response to events (monitor power-on, etc) and so more round-trips won't do anything but waste CPU
<danieldg> if it *wasn't* guaranteed then there would need to be an end
<soreau> danieldg: I mean what if there's a future where there's like.. a *lot* of protocols to advertise.. still guaranteed one roundtrip is enough?
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<danieldg> yes, because you send one "global list request" and then one "sync" request, so the reply is "all globals" then "callback done"
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<soreau> oh, so there is a done concept
<danieldg> that's how sync works
<danieldg> if you don't ask for a sync after asking for globals you don't know when it's done. But everyone does that.
<soreau> danieldg: everyone does what?
<soreau> sync or not?
<danieldg> send get_regitery and sync as the first two commands
<danieldg> look at WAYLAND_DEBUG=1 output from any client
<soreau> while debug does show sync calls, I don't see wl_display_sync called explicitly anywhere except in libwayland-client
<danieldg> roundtrip is "call sync and then wait for done before returning"
<danieldg> you could call sync yourself if you actually wanted to do things during startup (load stuff, for example)
<soreau> ah, that's like an xcb trick :)
<danieldg> or you can be boring and use threads like everyone else probably does
<soreau> ok, mystery solved
<soreau> danieldg: thanks
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<wlb> wayland Issue #429 opened by Krzysztof Bochm (bochmkrzysztof) Code null pointer dereference in event loop epoll https://gitlab.freedesktop.org/wayland/wayland/-/issues/429
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<wlb> weston Issue #855 opened by M B (mwberry) weston exits with non-zero exit code and no obvious error log https://gitlab.freedesktop.org/wayland/weston/-/issues/855
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