Don't allow event loop to be interrupted at any time. (#223)

Author: ioquatix

lib/async/scheduler.rb

@@ -258,9 +258,12 @@ def run(...)
 
 			@interrupted = false
 
-			while self.run_once
-				if @interrupted
-					break
+			# In theory, we could use Exception here to be a little bit safer, but we've only shown the case for SignalException to be a problem, so let's not over-engineer this.
+			Thread.handle_interrupt(SignalException => :never) do
+				while self.run_once
+					if @interrupted || Thread.pending_interrupt?
+						break
+					end
 				end
 			end