由于所有消息都按顺序处理，应用程序流不会被回调和中断分离，因此更容易调试。
Easier to debug because the messages are all handled sequentially and the flow is not disjointed by callbacks and interrupts.
程序中的信号处理程序捕获到函数的执行被某个信号中断，信号处理程序然后按正常方式返回。
EINTR — the function was interrupted by a signal, which was caught by a signal handler in the program, and the signal handler returned normally.
必须将应用程序和资源设计为按用户需求、业务策略和竞争压力处理不同的更改。
Applications and resources must be designed to handle diverse changes in user needs, business strategies, and competitive pressures.
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