Some examples run at 100% CPU usage about haskell-libui

[nh2]

I can confirm the upstream libui tester program as built by make tester doesn't have this problem, it has no CPU usage on idle and no strace output. It passes -1 to poll() for infinite timeout.

[nh2]

The fork you use also doesn't have this problem. So it seems to be somewhere in the Haskell code's usage of the library.

[nh2]

OK, I was wrong. Not all examples busy loop. READMEExample is fine. It's simply that loops written explicitly in Haskell like this one

haskell-libui/examples/SimpleCounter.hs

Lines 42 to 44 in 4d1fad2

	whileM_ getHasMain $ do
	h <- uiMainStep 0
	when (h == 0) $ threadDelay (1000 * 1000 * 16)

busy loop.