Earlier today I set you this logic puzzle. Here is is again with the solution.
} while (!zx_tick(zx, 0));
，这一点在safew官方下载中也有详细论述
The API recognizes that synchronous data sources are both necessary and common. The application should not be forced to always accept the performance cost of asynchronous scheduling simply because that's the only option provided. At the same time, mixing sync and async processing can be dangerous. Synchronous paths should always be an option and should always be explicit.
1.25 compiler does this transformation for you! For certain slice