Suppose a signal is generated during the very small time gap between setting the errno variable by the close system call and its return.
假定信号在close系统调用设置errno变量到其返回之前这一极小的时间片段内生成。
A signal is simply any physical quantity whose magnitude and variation with time (or occasionally some other variable) contain information.
信号是任意自然物理量随其规模和时间(或其他一些随机变量)的变化而包含的信息。
Compared with other delay systems, it has an advantage that the time delay is continuously variable, so th at it can satisfy the need of signal delay processing.
与其它延迟系统相比，本系统的优点在于延迟时间可连续变化，延迟总时间可满足信号处理的要求。
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