run_in_thread.vala

public delegate G TaskFunc<G> () throws Error;

public async G run_in_thread<G> (owned TaskFunc<G> func) throws Error {
	SourceFunc resume = run_in_thread.callback;
	Error err = null;
	G result = null;
	new Thread<void*> (null, () => {
		try {
			result = func ();
		} catch (Error e) {
			err = e;
		}
		Idle.add ((owned) resume);
		return null;
	});
	yield;
	if (err != null) {
		throw err;
	}
	return result;
}