HelenOS sources

demo_loop        1097 uspace/app/gfxdemo/gfxdemo.c 	rc = demo_loop(gc, cols, rows);
demo_loop        1114 uspace/app/gfxdemo/gfxdemo.c 	rc = demo_loop(args->gc, args->dims.x, args->dims.y);
demo_loop        1261 uspace/app/gfxdemo/gfxdemo.c 	rc = demo_loop(gc, 400, 300);
HelenOS homepage, sources at GitHub