Jonas Ådahl 788ad43e17 thread: Allow switching thread type
This will be necessary in order to default to 'kernel' and then switch
to 'user' if the thread instance can no longer be properly multi
threaded.

To avoid having the same thread impl creating and destroying
GMainContext's, this also means always creating a GMainContext for the
thread-impl. When running in user-thread mode, the GMainContext is
wrapped in a wrapper source and dispatched as part of the real main
thread GMainContext, and when in kernel-thread mode, it runs
independently in the dedicated thread.

This has the consequence that the wrapper source will always have the
priority of the highest impl context GSource, but only after it has
dispatched once. Would we need it earlier than that, we either need a
way to introspect existing sources in a GMainContext and their
priorities, or manually track known sources in MetaThreadImpl.

The wrapper source will never be below 0, as that'd mean it could reach
INT_MAX priority if it had no more sources attached to it, meaning it'd
never be dispatched again.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2777>
2023-07-17 21:19:34 +02:00
..
2019-10-21 14:04:30 +00:00
2019-01-22 18:31:53 +01:00
2023-05-24 14:16:41 +02:00