// Reset changes the timer to expire after duration d.// It returns true if the timer had been active, false if the timer had// expired or been stopped.//// For a Timer created with NewTimer, Reset should be invoked only on// stopped or expired timers with drained channels.//// If a program has already received a value from t.C, the timer is known// to have expired and the channel drained, so t.Reset can be used directly.// If a program has not yet received a value from t.C, however,// the timer must be stopped and—if Stop reports that the timer expired// before being stopped—the channel explicitly drained://// if !t.Stop() {// <-t.C// }// t.Reset(d)//// This should not be done concurrent to other receives from the Timer's// channel.//// Note that it is not possible to use Reset's return value correctly, as there// is a race condition between draining the channel and the new timer expiring.// Reset should always be invoked on stopped or expired channels, as described above.// The return value exists to preserve compatibility with existing programs.//// For a Timer created with AfterFunc(d, f), Reset either reschedules// when f will run, in which case Reset returns true, or schedules f// to run again, in which case it returns false.// When Reset returns false, Reset neither waits for the prior f to// complete before returning nor does it guarantee that the subsequent// goroutine running f does not run concurrently with the prior// one. If the caller needs to know whether the prior execution of// f is completed, it must coordinate with f explicitly.func(t *Timer)Reset(d Duration)bool{if t.r.f ==nil{panic("time: Reset called on uninitialized Timer")}
w :=when(d)returnresetTimer(&t.r, w)}
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原文链接:https://blog.csdn.net/daska110/article/details/119606755
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