[eval] If one thread is blocked other treads stop too

[RealyUniqueName]

class Main {
	public static function main() {
		var p = new sys.io.Process('haxe', ['-cmd', 'sleep 10']);
		sys.thread.Thread.create(() -> {
			Sys.println('hello');
			Sys.sleep(0.1);
			Sys.println('world'); // this is never printed
		});
		Sys.sleep(0.1);
		p.stdout.readByte();
	}
}

$ haxe -cp src --run Main
hello
<... hangs for 10 seconds ...>
/usr/share/haxe/std/eval/_std/sys/io/Process.hx:93: characters 4-9 : Uncaught exception Eof
/usr/share/haxe/std/eval/_std/sys/io/Process.hx:80: characters 7-27 : Called from here
src/Main.hx:18: characters 3-22 : Called from here

[Simn]

I don't think there's anything I can do here while Haxe is written in OCaml.

[ncannasse]

That's strange, because performing I/O should release the global interpreter lock, allowing the other thread to execute.

[Simn]

The only thing we could do here is place some strategic Thread.yield() calls. In this particular case, the problem is that we're still using your Thread implementation from 1789, so OCaml has no idea what exactly we're doing.

My concern is that this would require yielding in a lot of places. I'm inclined to not touch this at all until we have a proper sys API in 4.1.

[Simn]

Actually, yielding isn't going to help here either because the Sys.sleep also yields, so depending on who yields first we just end up with the same situation.

[Simn]

I'm closing this because I still don't think there's anything I can do here.