bug#36609: 27.0.50; Possible race-condition in threading implementation

[Pip Cet]

Patch attached.

It's possible this'll livelock certain glib libraries that want to
modify the glib main context while another thread is running. I don't
see a good way to fix that, but a bad way would be to apply some
heuristic (such as a 10 ms delay between calling select() and assuming
it actually was called).

0001-Fix-lock-failures-in-xg_select-bug-36609.patch
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