use stduse thread const Threadc = 8 var wg const main = {	wg = thread.mkwg(Threadc) 	for var i = 0; i < Threadc; i++		thread.spawn({			std.usleep(3_000_000)			thread.wgpost(&wg)			thread.wgwait(&wg)		})	;;	thread.wgwait(&wg)}